{"id":18429,"date":"2022-04-06T13:01:42","date_gmt":"2022-04-06T07:31:42","guid":{"rendered":"https:\/\/ccssmathanswers.com\/?p=18429"},"modified":"2022-04-07T11:47:02","modified_gmt":"2022-04-07T06:17:02","slug":"big-ideas-math-answers-grade-2-chapter-2","status":"publish","type":"post","link":"https:\/\/bigideasmathanswers.com\/big-ideas-math-answers-grade-2-chapter-2\/","title":{"rendered":"Big Ideas Math Answers Grade 2 Chapter 2 Fluency and Strategies within 20"},"content":{"rendered":"<p>Get Big Ideas Math Book 2rd Grade Answer Key Chapter 2 Fluency and Strategies within 20 on this page. This BIM Grade 2 Chapter 2 Fluency and Strategies within 20 Answer Key is useful for the students while preparing for the exams and preparation tests. You can download <a href=\"https:\/\/bigideasmathanswers.com\/big-ideas-math-answers-grade-2\/\">Big Ideas Math Answers Grade 2<\/a> Chapter 2 Fluency and Strategies within 20 PDF for free of cost.<\/p>\n<h2>Big Ideas Math Book 2nd Grade Answer Key Chapter 2 Fluency and Strategies within 20<\/h2>\n<p>Understand all the concepts of BIM 2nd Grade Solutions for 2nd Chapter Fluency and Strategies within 20. Most of the students may think that learning fluency and strategies within 20 is not an easy topic. So, we are giving a detailed step by step explanation for all the topics in a simple manner. So go through the following sections and start your preparation with love and joy.<\/p>\n<p>The different topics in Big Ideas Math Grade 2 Chapter 2 Fluency and Strategies within 20 Solution Key are Add in Any Order, Use Doubles, Add Three Numbers, Count On and Count Back to Subtract, Relate Addition, Subtraction, and others.\u00a0 Just tap the below links and start your preparation. By using these links you can score the highest marks in the exams.<\/p>\n<p><strong>Vocabulary<\/strong><\/p>\n<ul>\n<li><a href=\"#Fluency_and_Strategies_within_20_Vocabulary\">Fluency and Strategies within 20 Vocabulary<\/a><\/li>\n<\/ul>\n<p><strong>Lesson: 1 Add in Any Order<\/strong><\/p>\n<ul>\n<li><a href=\"#Lesson_2.1_Add_in_Any_Order\">Lesson 2.1 Add in Any Order<\/a><\/li>\n<li><a href=\"#Add_in_Any_Order_Homework_&amp;_Practice_2.1\">Add in Any Order Homework &amp; Practice 2.1<\/a><\/li>\n<\/ul>\n<p><strong>Lesson: 2 Use Doubles<\/strong><\/p>\n<ul>\n<li><a href=\"#Lesson_2.2_Use_Doubles\">Lesson 2.2 Use Doubles<\/a><\/li>\n<li><a href=\"#Use_Doubles_Homework_&amp;_Practice_2.2\">Use Doubles Homework &amp; Practice 2.2<\/a><\/li>\n<\/ul>\n<p><strong>Lesson: 3 Add Three Numbers<\/strong><\/p>\n<ul>\n<li><a href=\"#Lesson_2.3_Add_Three_Numbers\">Lesson 2.3 Add Three Numbers<\/a><\/li>\n<li><a href=\"#Add_Three_Numbers_Homework_&amp;_Practice_2.3\">Add Three Numbers Homework &amp; Practice 2.3<\/a><\/li>\n<\/ul>\n<p><strong>Lesson: 4 Make a 10 to Add<\/strong><\/p>\n<ul>\n<li><a href=\"#Lesson_2.4_Make_a_10_to_Add\">Lesson 2.4 Make a 10 to Add<\/a><\/li>\n<li><a href=\"#Make_a_10_to_Add_Homework_&amp;_Practice_2.4\">Make a 10 to Add Homework &amp; Practice 2.4<\/a><\/li>\n<\/ul>\n<p><strong>Lesson: 5 Count On and Count Back to Subtract<\/strong><\/p>\n<ul>\n<li><a href=\"#Lesson_2.5_Count_On_and_Count_Back_to_Subtract\">Lesson 2.5 Count On and Count Back to Subtract<\/a><\/li>\n<li><a href=\"#Count_On_and_Count_Back_to_Subtract_Homework_&amp;_Practice_2.5\">Count On and Count Back to Subtract Homework &amp; Practice 2.5<\/a><\/li>\n<\/ul>\n<p><strong>Lesson: 6 Relate Addition and Subtraction<\/strong><\/p>\n<ul>\n<li><a href=\"#Lesson_2.6_Relate_Addition_and_Subtraction\">Lesson 2.6 Relate Addition and Subtraction<\/a><\/li>\n<li><a href=\"#Relate_Addition_and_Subtraction_Homework_&amp;_Practice_2.6\">Relate Addition and Subtraction Homework &amp; Practice 2.6<\/a><\/li>\n<\/ul>\n<p><strong>Lesson: 7 Get to 10 to Subtract<\/strong><\/p>\n<ul>\n<li><a href=\"#Lesson_2.7_Get_to_10_to_Subtract\">Lesson 2.7 Get to 10 to Subtract<\/a><\/li>\n<li><a href=\"#Get_to_10_to_Subtract_Homework_&amp;_Practice_2.7\">Get to 10 to Subtract Homework &amp; Practice 2.7<\/a><\/li>\n<\/ul>\n<p><strong>Lesson: 8 Practice Addition and Subtraction<\/strong><\/p>\n<ul>\n<li><a href=\"#Lesson_2.8_Practice_Addition_and_Subtraction\">Lesson 2.8 Practice Addition and Subtraction<\/a><\/li>\n<li><a href=\"#Practice_Addition_and_Subtraction_Homework_&amp;_Practice_2.8\">Practice Addition and Subtraction Homework &amp; Practice 2.8<\/a><\/li>\n<\/ul>\n<p><strong>Lesson: 9 Problem Solving: Addition and Subtraction<\/strong><\/p>\n<ul>\n<li><a href=\"#Lesson_2.9_Problem_Solving:_Addition_and_Subtraction\">Lesson 2.9 Problem Solving: Addition and Subtraction<\/a><\/li>\n<li><a href=\"#Problem_Solving:_Addition_and_Subtraction_Homework_&amp;_Practice_2.9\">Problem Solving: Addition and Subtraction Homework &amp; Practice 2.9<\/a><\/li>\n<\/ul>\n<p><strong>Chapter: 2 &#8211; Fluency and Strategies within 20<\/strong><\/p>\n<ul>\n<li><a href=\"#Fluency_and_Strategies_within_20_Activity\">Fluency and Strategies within 20 Activity<\/a><\/li>\n<li><a href=\"#Fluency_and_Strategies_within_20_Chapter_Practice\">Fluency and Strategies within 20 Chapter Practice<\/a><\/li>\n<\/ul>\n<h3><a id=\"Fluency_and_Strategies_within_20_Vocabulary\"><\/a>Fluency and Strategies within 20 Vocabulary<\/h3>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-18764\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-1.png\" alt=\"Big Ideas Math Answers Grade 2 Chapter 2 Fluency and Strategies within 20 1\" width=\"237\" height=\"130\" \/><\/p>\n<p><strong>Organize It<\/strong><br \/>\nUse the review words to complete the graphic organizer.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18804\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-2.png\" alt=\"Big Ideas Math Solutions Grade 2 Chapter 2 Fluency and Strategies within 20 2\" width=\"532\" height=\"241\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-2.png 532w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-2-300x136.png 300w\" sizes=\"(max-width: 532px) 100vw, 532px\" \/><\/p>\n<p>Answer:<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-48434\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Vocabulary-Organize-It.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2- Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Vocabulary-Organize It\" width=\"532\" height=\"241\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Vocabulary-Organize-It.jpg 532w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Vocabulary-Organize-It-300x136.jpg 300w\" sizes=\"(max-width: 532px) 100vw, 532px\" \/><\/p>\n<p><strong>Define It<\/strong><br \/>\nUse your vocabulary cards to match.<\/p>\n<p>Question 1.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18805\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-3.png\" alt=\"Big Ideas Math Solutions Grade 2 Chapter 2 Fluency and Strategies within 20 3\" width=\"585\" height=\"256\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-3.png 585w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-3-300x131.png 300w\" sizes=\"(max-width: 585px) 100vw, 585px\" \/><\/p>\n<p>Answer:<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-48435\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Vocabulary-Define-It-Question-1.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2- Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Vocabulary-Define-It-Question-1\" width=\"585\" height=\"256\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Vocabulary-Define-It-Question-1.jpg 585w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Vocabulary-Define-It-Question-1-300x131.jpg 300w\" sizes=\"(max-width: 585px) 100vw, 585px\" \/><\/p>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-18807\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-4.png\" alt=\"Big Ideas Math Solutions Grade 2 Chapter 2 Fluency and Strategies within 20 4\" width=\"570\" height=\"613\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-4.png 570w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-4-279x300.png 279w\" sizes=\"(max-width: 570px) 100vw, 570px\" \/><br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18808\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-5.png\" alt=\"Big Ideas Math Solutions Grade 2 Chapter 2 Fluency and Strategies within 20 5\" width=\"562\" height=\"626\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-5.png 562w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-5-269x300.png 269w\" sizes=\"(max-width: 562px) 100vw, 562px\" \/><\/p>\n<p>Answer:<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-48436\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Vocabulary-Define-It-Question-2.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2- Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Vocabulary-Define-It-Question-2\" width=\"562\" height=\"626\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Vocabulary-Define-It-Question-2.jpg 562w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Vocabulary-Define-It-Question-2-269x300.jpg 269w\" sizes=\"(max-width: 562px) 100vw, 562px\" \/><\/p>\n<h3><a id=\"Lesson_2.1_Add_in_Any_Order\"><\/a>Lesson 2.1 Add in Any Order<\/h3>\n<p><strong>Explore and Grow<\/strong><\/p>\n<p>Use the table to \ufb01nd the sum. Change the order of the addends. Write the new equation.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18810\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-6.png\" alt=\"Big Ideas Math Solutions Grade 2 Chapter 2 Fluency and Strategies within 20 6\" width=\"492\" height=\"563\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-6.png 492w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-6-262x300.png 262w\" sizes=\"(max-width: 492px) 100vw, 492px\" \/><\/p>\n<p>Answer:<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-48467\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.1-Add-in-Any-Order-Explore-and-Grow.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2- Fluency-and-Strategies-within-20-Lesson-2.1-Add-in-Any-Order-Explore-and-Grow\" width=\"492\" height=\"563\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.1-Add-in-Any-Order-Explore-and-Grow.jpg 492w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.1-Add-in-Any-Order-Explore-and-Grow-262x300.jpg 262w\" sizes=\"(max-width: 492px) 100vw, 492px\" \/><img loading=\"lazy\" class=\"alignnone size-full wp-image-48474\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.1-Add-in-Any-Order-Explore-and-Grow-1.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2- Fluency-and-Strategies-within-20-Lesson-2.1-Add-in-Any-Order-Explore-and-Grow\" width=\"492\" height=\"563\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.1-Add-in-Any-Order-Explore-and-Grow-1.jpg 492w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.1-Add-in-Any-Order-Explore-and-Grow-1-262x300.jpg 262w\" sizes=\"(max-width: 492px) 100vw, 492px\" \/><\/p>\n<p>Explanation:<br \/>\n<span id=\"P62_28\" class=\"s1 f252 fs9 l0\">Changing the order of the addends <\/span><span id=\"P62_30\" class=\"s1 f252 fs9 l0\">does <\/span><span id=\"P62_31\" class=\"s1 f252 fs9 l0\">not change the<\/span><span id=\"P62_33\" class=\"s1 f253 fs9 l0\">\u00a0<\/span><span id=\"P62_34\" class=\"s1 f253 fs9 l0\">sum.<br \/>\n<span id=\"P62_38\" class=\"s1 f254 fs9 l0\">The expressions 5 + 6<\/span><span id=\"P62_41\" class=\"s1 f254 fs9 l0\"> and 6 + 5<\/span><span id=\"P62_43\" class=\"s1 f254 fs9 l0\">\u00a0<\/span><span id=\"P62_44\" class=\"s1 f254 fs9 l0\">are both equal to 11. The expressions is represented by red color and sum by green.<br \/>\nThe expressions 4 + 9 and 9 + 4 are both equal to 13. The expressions are represented by blue color and sum by yellow.<\/span><\/span><\/p>\n<p><strong>Show and Grow<\/strong><\/p>\n<p>Question 1.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18811\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-7.png\" alt=\"Big Ideas Math Solutions Grade 2 Chapter 2 Fluency and Strategies within 20 7\" width=\"584\" height=\"87\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-7.png 584w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-7-300x45.png 300w\" sizes=\"(max-width: 584px) 100vw, 584px\" \/><br \/>\nAnswer:<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-48477\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.1-Add-in-Any-Order-Show-and-Grow-question-1.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2- Fluency-and-Strategies-within-20-Lesson-2.1-Add-in-Any-Order- Show-and-Grow-question-1\" width=\"584\" height=\"87\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.1-Add-in-Any-Order-Show-and-Grow-question-1.jpg 584w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.1-Add-in-Any-Order-Show-and-Grow-question-1-300x45.jpg 300w\" sizes=\"(max-width: 584px) 100vw, 584px\" \/><\/p>\n<p>Explanation:<br \/>\n<span id=\"P62_28\" class=\"s1 f252 fs9 l0\">Changing the order of the addends <\/span><span id=\"P62_30\" class=\"s1 f252 fs9 l0\">does <\/span><span id=\"P62_31\" class=\"s1 f252 fs9 l0\">not change the<\/span><span id=\"P62_33\" class=\"s1 f253 fs9 l0\">\u00a0<\/span><span id=\"P62_34\" class=\"s1 f253 fs9 l0\">sum.<br \/>\n<span id=\"P62_38\" class=\"s1 f254 fs9 l0\">The expressions 6 + 3 and 3 + 6<\/span><span id=\"P62_43\" class=\"s1 f254 fs9 l0\">\u00a0<\/span><span id=\"P62_44\" class=\"s1 f254 fs9 l0\">are both equal to 9. The addend 6 is represented by orange color and addend 3 by blue.<\/span><\/span><\/p>\n<p>Question 2.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18812\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-8.png\" alt=\"Big Ideas Math Solutions Grade 2 Chapter 2 Fluency and Strategies within 20 8\" width=\"583\" height=\"87\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-8.png 583w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-8-300x45.png 300w\" sizes=\"(max-width: 583px) 100vw, 583px\" \/><\/p>\n<p>Answer:<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-48479\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.1-Add-in-Any-Order-Show-and-Grow-question-2.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2- Fluency-and-Strategies-within-20-Lesson-2.1-Add-in-Any-Order- Show-and-Grow-question-2\" width=\"567\" height=\"97\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.1-Add-in-Any-Order-Show-and-Grow-question-2.jpg 567w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.1-Add-in-Any-Order-Show-and-Grow-question-2-300x51.jpg 300w\" sizes=\"(max-width: 567px) 100vw, 567px\" \/><\/p>\n<p>Explanation:<br \/>\n<span id=\"P62_28\" class=\"s1 f252 fs9 l0\">Changing the order of the addends <\/span><span id=\"P62_30\" class=\"s1 f252 fs9 l0\">does <\/span><span id=\"P62_31\" class=\"s1 f252 fs9 l0\">not change the<\/span><span id=\"P62_33\" class=\"s1 f253 fs9 l0\">\u00a0<\/span><span id=\"P62_34\" class=\"s1 f253 fs9 l0\">sum.<br \/>\n<span id=\"P62_38\" class=\"s1 f254 fs9 l0\">The expressions 5 + 1 and 1 + 5<\/span><span id=\"P62_43\" class=\"s1 f254 fs9 l0\">\u00a0<\/span><span id=\"P62_44\" class=\"s1 f254 fs9 l0\">are both equal to 6. The addend 5 is represented by yellow color and addend 1 by green.<\/span><\/span><\/p>\n<p>Find the sum. Then change the order of the addends. Write the new equation.<\/p>\n<p>Question 3.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18813\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-9.png\" alt=\"Big Ideas Math Solutions Grade 2 Chapter 2 Fluency and Strategies within 20 9\" width=\"574\" height=\"40\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-9.png 574w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-9-300x21.png 300w\" sizes=\"(max-width: 574px) 100vw, 574px\" \/><br \/>\nAnswer:<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-48480\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.1-Add-in-Any-Order-Show-and-Grow-question-3.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2- Fluency-and-Strategies-within-20-Lesson-2.1-Add-in-Any-Order- Show-and-Grow-question-3\" width=\"574\" height=\"40\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.1-Add-in-Any-Order-Show-and-Grow-question-3.jpg 574w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.1-Add-in-Any-Order-Show-and-Grow-question-3-300x21.jpg 300w\" sizes=\"(max-width: 574px) 100vw, 574px\" \/><br \/>\nExplanation:<br \/>\n<span id=\"P62_28\" class=\"s1 f252 fs9 l0\">Changing the order of the addends <\/span><span id=\"P62_30\" class=\"s1 f252 fs9 l0\">does <\/span><span id=\"P62_31\" class=\"s1 f252 fs9 l0\">not change the<\/span><span id=\"P62_33\" class=\"s1 f253 fs9 l0\">\u00a0<\/span><span id=\"P62_34\" class=\"s1 f253 fs9 l0\">sum.<br \/>\n<span id=\"P62_38\" class=\"s1 f254 fs9 l0\">The expressions 8 +2 and 2 + 8<\/span><\/span><span id=\"P62_43\" class=\"s1 f254 fs9 l0\" style=\"font-size: 16px;\">\u00a0<\/span><span id=\"P62_44\" class=\"s1 f254 fs9 l0\" style=\"font-size: 16px;\">are both equal to the sum 10.\u00a0<\/span><\/p>\n<p>Question 4.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18814\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-10.png\" alt=\"Big Ideas Math Solutions Grade 2 Chapter 2 Fluency and Strategies within 20 10\" width=\"580\" height=\"54\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-10.png 580w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-10-300x28.png 300w\" sizes=\"(max-width: 580px) 100vw, 580px\" \/><br \/>\nAnswer:<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-48482\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.1-Add-in-Any-Order-Show-and-Grow-question-4.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2- Fluency-and-Strategies-within-20-Lesson-2.1-Add-in-Any-Order- Show-and-Grow-question-4\" width=\"580\" height=\"54\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.1-Add-in-Any-Order-Show-and-Grow-question-4.jpg 580w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.1-Add-in-Any-Order-Show-and-Grow-question-4-300x28.jpg 300w\" sizes=\"(max-width: 580px) 100vw, 580px\" \/><br \/>\nExplanation:<br \/>\n<span id=\"P62_28\" class=\"s1 f252 fs9 l0\">Changing the order of the addends <\/span><span id=\"P62_30\" class=\"s1 f252 fs9 l0\">does <\/span><span id=\"P62_31\" class=\"s1 f252 fs9 l0\">not change the<\/span><span id=\"P62_33\" class=\"s1 f253 fs9 l0\">\u00a0<\/span><span id=\"P62_34\" class=\"s1 f253 fs9 l0\">sum.<br \/>\n<span id=\"P62_38\" class=\"s1 f254 fs9 l0\">The expressions 4 + 3 and 3 + 4 <\/span><\/span><span id=\"P62_43\" class=\"s1 f254 fs9 l0\" style=\"font-size: 16px;\">\u00a0<\/span><span id=\"P62_44\" class=\"s1 f254 fs9 l0\" style=\"font-size: 16px;\">are both equal to the sum 7.\u00a0<\/span><\/p>\n<p><strong>Apply and Grow: Practice<\/strong><\/p>\n<p>Find the sum. Then change the order of the addends. Write the new equation.<\/p>\n<p>Question 5.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18815\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-11.png\" alt=\"Big Ideas Math Solutions Grade 2 Chapter 2 Fluency and Strategies within 20 11\" width=\"560\" height=\"47\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-11.png 560w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-11-300x25.png 300w\" sizes=\"(max-width: 560px) 100vw, 560px\" \/><br \/>\nAnswer:<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-48483\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.1-Add-in-Any-Order-Apply-and-Grow-Practice-Question-5.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2- Fluency-and-Strategies-within-20-Lesson-2.1-Add-in-Any-Order-Apply-and-Grow-Practice-Question-5\" width=\"560\" height=\"47\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.1-Add-in-Any-Order-Apply-and-Grow-Practice-Question-5.jpg 560w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.1-Add-in-Any-Order-Apply-and-Grow-Practice-Question-5-300x25.jpg 300w\" sizes=\"(max-width: 560px) 100vw, 560px\" \/><br \/>\nExplanation:<br \/>\n<span id=\"P62_28\" class=\"s1 f252 fs9 l0\">Changing the order of the addends <\/span><span id=\"P62_30\" class=\"s1 f252 fs9 l0\">does <\/span><span id=\"P62_31\" class=\"s1 f252 fs9 l0\">not change the<\/span><span id=\"P62_33\" class=\"s1 f253 fs9 l0\">\u00a0<\/span><span id=\"P62_34\" class=\"s1 f253 fs9 l0\">sum.<br \/>\n<span id=\"P62_38\" class=\"s1 f254 fs9 l0\">The expressions 4 + 3 and 3 + 4 <\/span><\/span><span id=\"P62_43\" class=\"s1 f254 fs9 l0\" style=\"font-size: 16px;\">\u00a0<\/span><span id=\"P62_44\" class=\"s1 f254 fs9 l0\" style=\"font-size: 16px;\">are both equal to the sum 7.\u00a0<\/span><\/p>\n<p>Question 6.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18816\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-12.png\" alt=\"Big Ideas Math Solutions Grade 2 Chapter 2 Fluency and Strategies within 20 12\" width=\"560\" height=\"67\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-12.png 560w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-12-300x36.png 300w\" sizes=\"(max-width: 560px) 100vw, 560px\" \/><br \/>\nAnswer:<br \/>\n7 + 3 = 10\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a03 + 7 = 10<br \/>\nExplanation:<br \/>\n<span id=\"P62_28\" class=\"s1 f252 fs9 l0\">Changing the order of the addends <\/span><span id=\"P62_30\" class=\"s1 f252 fs9 l0\">does <\/span><span id=\"P62_31\" class=\"s1 f252 fs9 l0\">not change the<\/span><span id=\"P62_33\" class=\"s1 f253 fs9 l0\">\u00a0<\/span><span id=\"P62_34\" class=\"s1 f253 fs9 l0\">sum.<br \/>\n<span id=\"P62_38\" class=\"s1 f254 fs9 l0\">The expressions 7 + 3 and 3 +\u00a0 7 <\/span><\/span><span id=\"P62_43\" class=\"s1 f254 fs9 l0\" style=\"font-size: 16px;\">\u00a0<\/span><span id=\"P62_44\" class=\"s1 f254 fs9 l0\" style=\"font-size: 16px;\">are both equal to the sum 10.\u00a0<\/span><\/p>\n<p>Question 7.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18817\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-13.png\" alt=\"Big Ideas Math Solutions Grade 2 Chapter 2 Fluency and Strategies within 20 13\" width=\"568\" height=\"64\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-13.png 568w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-13-300x34.png 300w\" sizes=\"(max-width: 568px) 100vw, 568px\" \/><br \/>\nAnswer:<br \/>\n6 + 5 = 11\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a05 + 6 = 11<br \/>\nExplanation:<br \/>\n<span id=\"P62_28\" class=\"s1 f252 fs9 l0\">Changing the order of the addends <\/span><span id=\"P62_30\" class=\"s1 f252 fs9 l0\">does <\/span><span id=\"P62_31\" class=\"s1 f252 fs9 l0\">not change the<\/span><span id=\"P62_33\" class=\"s1 f253 fs9 l0\">\u00a0<\/span><span id=\"P62_34\" class=\"s1 f253 fs9 l0\">sum.<br \/>\n<span id=\"P62_38\" class=\"s1 f254 fs9 l0\">The expressions 6 + 5 and 5 + 6<\/span><\/span><span id=\"P62_43\" class=\"s1 f254 fs9 l0\" style=\"font-size: 16px;\">\u00a0<\/span><span id=\"P62_44\" class=\"s1 f254 fs9 l0\" style=\"font-size: 16px;\">are both equal to the sum 11.\u00a0<\/span><\/p>\n<p>Question 8.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18818\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-14.png\" alt=\"Big Ideas Math Solutions Grade 2 Chapter 2 Fluency and Strategies within 20 14\" width=\"561\" height=\"68\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-14.png 561w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-14-300x36.png 300w\" sizes=\"(max-width: 561px) 100vw, 561px\" \/><br \/>\nAnswer:<br \/>\n17 = 9 + 8\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a017 = 8 + 9<br \/>\nExplanation:<br \/>\n<span id=\"P62_28\" class=\"s1 f252 fs9 l0\">Changing the order of the addends <\/span><span id=\"P62_30\" class=\"s1 f252 fs9 l0\">does <\/span><span id=\"P62_31\" class=\"s1 f252 fs9 l0\">not change the<\/span><span id=\"P62_33\" class=\"s1 f253 fs9 l0\">\u00a0<\/span><span id=\"P62_34\" class=\"s1 f253 fs9 l0\">sum.<br \/>\n<span id=\"P62_38\" class=\"s1 f254 fs9 l0\">The expressions 9 + 8 and 8 +9 <\/span><\/span><span id=\"P62_43\" class=\"s1 f254 fs9 l0\" style=\"font-size: 16px;\">\u00a0<\/span><span id=\"P62_44\" class=\"s1 f254 fs9 l0\" style=\"font-size: 16px;\">are both equal to the sum 17.\u00a0<\/span><\/p>\n<p>Question 9.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18819\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-15.png\" alt=\"Big Ideas Math Solutions Grade 2 Chapter 2 Fluency and Strategies within 20 15\" width=\"560\" height=\"67\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-15.png 560w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-15-300x36.png 300w\" sizes=\"(max-width: 560px) 100vw, 560px\" \/><br \/>\nAnswer:<br \/>\n2 = 0 + 2\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 2 = 2 +0<br \/>\nExplanation:<br \/>\n<span id=\"P62_28\" class=\"s1 f252 fs9 l0\">Changing the order of the addends <\/span><span id=\"P62_30\" class=\"s1 f252 fs9 l0\">does <\/span><span id=\"P62_31\" class=\"s1 f252 fs9 l0\">not change the<\/span><span id=\"P62_33\" class=\"s1 f253 fs9 l0\">\u00a0<\/span><span id=\"P62_34\" class=\"s1 f253 fs9 l0\">sum.<br \/>\n<span id=\"P62_38\" class=\"s1 f254 fs9 l0\">The expressions 0 + 2 and 2 + 0 <\/span><\/span><span id=\"P62_43\" class=\"s1 f254 fs9 l0\" style=\"font-size: 16px;\">\u00a0<\/span><span id=\"P62_44\" class=\"s1 f254 fs9 l0\" style=\"font-size: 16px;\">are both equal to the sum 2. Adding 0 to any number gives the sum the number itself.\u00a0<\/span><\/p>\n<p>Question 10.<br \/>\n<strong>DIG DEEPER!<\/strong><br \/>\nWhich shape completes the equation?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18821\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-16.png\" alt=\"Big Ideas Math Solutions Grade 2 Chapter 2 Fluency and Strategies within 20 16\" width=\"536\" height=\"206\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-16.png 536w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-16-300x115.png 300w\" sizes=\"(max-width: 536px) 100vw, 536px\" \/><br \/>\nAnswer:<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-48629\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.1-Add-in-Any-Order-Apply-and-Grow-Practice-Question-10.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2- Fluency-and-Strategies-within-20-Lesson-2.1-Add-in-Any-Order-Apply-and-Grow-Practice-Question-10\" width=\"536\" height=\"206\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.1-Add-in-Any-Order-Apply-and-Grow-Practice-Question-10.jpg 536w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.1-Add-in-Any-Order-Apply-and-Grow-Practice-Question-10-300x115.jpg 300w\" sizes=\"(max-width: 536px) 100vw, 536px\" \/><\/p>\n<p>Explanation:<br \/>\n<span id=\"P62_28\" class=\"s1 f252 fs9 l0\">Changing the order of the addends <\/span><span id=\"P62_30\" class=\"s1 f252 fs9 l0\">does <\/span><span id=\"P62_31\" class=\"s1 f252 fs9 l0\">not change the<\/span><span id=\"P62_33\" class=\"s1 f253 fs9 l0\">\u00a0<\/span><span id=\"P62_34\" class=\"s1 f253 fs9 l0\">sum.<\/span><\/p>\n<p><strong>Think and Grow: Modeling Real Life<\/strong><\/p>\n<p>You paint 12 shapes. 8 are rectangles. The rest are circles. How many circles do you paint?<br \/>\nWrite two equations that describe your shapes:<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18822\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-17.png\" alt=\"Big Ideas Math Solutions Grade 2 Chapter 2 Fluency and Strategies within 20 17\" width=\"178\" height=\"111\" \/><br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18823\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-18.png\" alt=\"Big Ideas Math Solutions Grade 2 Chapter 2 Fluency and Strategies within 20 18\" width=\"561\" height=\"106\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-18.png 561w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-18-300x57.png 300w\" sizes=\"(max-width: 561px) 100vw, 561px\" \/><\/p>\n<p>Answer:<br \/>\nGiven:<br \/>\nTotal number of shapes painted = 12<br \/>\nNumber of rectangles painted = 8<br \/>\nNumber of circles painted = total shapes painted &#8211; number of rectangles painted<br \/>\n12 &#8211; 8 = 4<br \/>\n8 + 4 = 12<br \/>\n4 + 8 = 12<br \/>\nTotal circles painted = 4.<\/p>\n<p><strong>Show and Grow<\/strong><\/p>\n<p>Question 11.<br \/>\nThere are 13 race cars. 6 of them have numbers. The rest do not. How many race cars do not have numbers?<br \/>\nWrite two equations that describe your shapes:<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18826\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-19.png\" alt=\"Big Ideas Math Solutions Grade 2 Chapter 2 Fluency and Strategies within 20 19\" width=\"192\" height=\"155\" \/><br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18824\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-19.1.png\" alt=\"Big Ideas Math Solutions Grade 2 Chapter 2 Fluency and Strategies within 20 19.1\" width=\"574\" height=\"95\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-19.1.png 574w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-19.1-300x50.png 300w\" sizes=\"(max-width: 574px) 100vw, 574px\" \/><br \/>\nExplain how you know your answer is correct.<br \/>\n_______________________________<br \/>\n_______________________________<br \/>\n_______________________________<br \/>\nAnswer:<br \/>\nTotal number of race cars = 13<br \/>\nNumber of race cars with numbers = 6.<br \/>\nNumber of race cars without number = total number of race cars &#8211; Number of race cars with numbers<br \/>\n13 &#8211; 6 = 7.<br \/>\nnumber of race cars with number + number of race cars without number = total number of race cars<br \/>\n6 + 7 = 13<br \/>\nwhen we reverse the order<br \/>\n7 + 6 = 13<br \/>\nExplanation:<br \/>\n<span id=\"P62_28\" class=\"s1 f252 fs9 l0\">Changing the order of the addends <\/span><span id=\"P62_30\" class=\"s1 f252 fs9 l0\">does <\/span><span id=\"P62_31\" class=\"s1 f252 fs9 l0\">not change the<\/span><span id=\"P62_33\" class=\"s1 f253 fs9 l0\">\u00a0<\/span><span id=\"P62_34\" class=\"s1 f253 fs9 l0\">sum.<\/span><br \/>\nGiven total race cars = 13<br \/>\nRace cars with number = 6<br \/>\nTo find the race cars without number we need to minus race cars with number from the total<br \/>\n13 &#8211; 6 = 7<\/p>\n<h3><a id=\"Add_in_Any_Order_Homework_&amp;_Practice_2.1\"><\/a>Add in Any Order Homework &amp; Practice 2.1<\/h3>\n<p>Question 1.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18827\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-20.png\" alt=\"Big Ideas Math Solutions Grade 2 Chapter 2 Fluency and Strategies within 20 20\" width=\"584\" height=\"95\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-20.png 584w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-20-300x49.png 300w\" sizes=\"(max-width: 584px) 100vw, 584px\" \/><\/p>\n<p>Answer:<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-48638\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2-Fluency-and-Strategies-within-20-Add-in-Any-Order-Homework-Practice-2.1-Question-1.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2- Fluency-and-Strategies-within-20-Add-in-Any-Order-Homework-Practice-2.1-Question-1\" width=\"577\" height=\"103\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2-Fluency-and-Strategies-within-20-Add-in-Any-Order-Homework-Practice-2.1-Question-1.jpg 577w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2-Fluency-and-Strategies-within-20-Add-in-Any-Order-Homework-Practice-2.1-Question-1-300x54.jpg 300w\" sizes=\"(max-width: 577px) 100vw, 577px\" \/><br \/>\nExplanation:<br \/>\n<span id=\"P62_28\" class=\"s1 f252 fs9 l0\">Changing the order of the addends <\/span><span id=\"P62_30\" class=\"s1 f252 fs9 l0\">does <\/span><span id=\"P62_31\" class=\"s1 f252 fs9 l0\">not change the<\/span><span id=\"P62_33\" class=\"s1 f253 fs9 l0\">\u00a0<\/span><span id=\"P62_34\" class=\"s1 f253 fs9 l0\">sum.<br \/>\n<\/span>Given 6 blue linking cubes and 4 red linking cubes<br \/>\nAdding blue and red gives the sum.<br \/>\n6 + 4 = 10.<br \/>\nwhen we reverse the colors order<br \/>\nadding\u00a0 red\u00a0 and\u00a0 blue gives the sum .<br \/>\n4 + 6 = 10.<\/p>\n<p>Question 2.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18828\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-21.png\" alt=\"Big Ideas Math Solutions Grade 2 Chapter 2 Fluency and Strategies within 20 21\" width=\"584\" height=\"89\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-21.png 584w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-21-300x46.png 300w\" sizes=\"(max-width: 584px) 100vw, 584px\" \/><br \/>\nAnswer:<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-48641\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2-Fluency-and-Strategies-within-20-Add-in-Any-Order-Homework-Practice-2.1-Question-2.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2- Fluency-and-Strategies-within-20-Add-in-Any-Order-Homework-Practice-2.1-Question-2\" width=\"584\" height=\"89\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2-Fluency-and-Strategies-within-20-Add-in-Any-Order-Homework-Practice-2.1-Question-2.jpg 584w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2-Fluency-and-Strategies-within-20-Add-in-Any-Order-Homework-Practice-2.1-Question-2-300x46.jpg 300w\" sizes=\"(max-width: 584px) 100vw, 584px\" \/><br \/>\nExplanation:<br \/>\n<span id=\"P62_28\" class=\"s1 f252 fs9 l0\">Changing the order of the addends <\/span><span id=\"P62_30\" class=\"s1 f252 fs9 l0\">does <\/span><span id=\"P62_31\" class=\"s1 f252 fs9 l0\">not change the<\/span><span id=\"P62_33\" class=\"s1 f253 fs9 l0\">\u00a0<\/span><span id=\"P62_34\" class=\"s1 f253 fs9 l0\">sum.<br \/>\n<\/span>Given 1 yellow linking cubes and 8 orange linking cubes<br \/>\nAdding yellow and orange cube gives the sum<br \/>\n1 + 8 = 9.<br \/>\nwhen we reverse the colors order<br \/>\nadding orange and yellow cubes gives the sum<br \/>\n8 + 1 = 9.<\/p>\n<p>Find the sum. Then change the order of the addends.<br \/>\nWrite the new equation.<\/p>\n<p>Question 3.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18829\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-22.png\" alt=\"Big Ideas Math Solutions Grade 2 Chapter 2 Fluency and Strategies within 20 22\" width=\"604\" height=\"52\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-22.png 604w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-22-300x26.png 300w\" sizes=\"(max-width: 604px) 100vw, 604px\" \/><br \/>\nAnswer:<br \/>\n7 + 0 = 7\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 0 + 7 = 7<br \/>\nExplanation:<br \/>\n<span id=\"P62_28\" class=\"s1 f252 fs9 l0\">Changing the order of the addends <\/span><span id=\"P62_30\" class=\"s1 f252 fs9 l0\">does <\/span><span id=\"P62_31\" class=\"s1 f252 fs9 l0\">not change the<\/span><span id=\"P62_33\" class=\"s1 f253 fs9 l0\">\u00a0<\/span><span id=\"P62_34\" class=\"s1 f253 fs9 l0\">sum.<\/span><br \/>\nAdding any number to 0 gives the sum the number itself.<\/p>\n<p>Question 4.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18830\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-23.png\" alt=\"Big Ideas Math Solutions Grade 2 Chapter 2 Fluency and Strategies within 20 23\" width=\"598\" height=\"48\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-23.png 598w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-23-300x24.png 300w\" sizes=\"(max-width: 598px) 100vw, 598px\" \/><br \/>\nAnswer:<br \/>\n2 + 4 = 6\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a04 + 2 = 6<br \/>\nExplanation:<br \/>\n<span id=\"P62_28\" class=\"s1 f252 fs9 l0\">Changing the order of the addends <\/span><span id=\"P62_30\" class=\"s1 f252 fs9 l0\">does <\/span><span id=\"P62_31\" class=\"s1 f252 fs9 l0\">not change the<\/span><span id=\"P62_33\" class=\"s1 f253 fs9 l0\">\u00a0<\/span><span id=\"P62_34\" class=\"s1 f253 fs9 l0\">sum.<br \/>\n<\/span>The expressions 2 + 4 and\u00a0 4 + 2 gives the same sum 6.<\/p>\n<p>Question 5.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18831\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-24.png\" alt=\"Big Ideas Math Solutions Grade 2 Chapter 2 Fluency and Strategies within 20 24\" width=\"593\" height=\"46\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-24.png 593w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-24-300x23.png 300w\" sizes=\"(max-width: 593px) 100vw, 593px\" \/><br \/>\nAnswer:<br \/>\n15 = 8 + 7\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a07 + 8 = 15<br \/>\nExplanation:<br \/>\n<span id=\"P62_28\" class=\"s1 f252 fs9 l0\">Changing the order of the addends <\/span><span id=\"P62_30\" class=\"s1 f252 fs9 l0\">does <\/span><span id=\"P62_31\" class=\"s1 f252 fs9 l0\">not change the<\/span><span id=\"P62_33\" class=\"s1 f253 fs9 l0\">\u00a0<\/span><span id=\"P62_34\" class=\"s1 f253 fs9 l0\">sum.<br \/>\n<\/span>The expressions 8 + 7 and 7 +8\u00a0 gives the same sum 15.<\/p>\n<p>Question 6.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18832\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-25.png\" alt=\"Big Ideas Math Solutions Grade 2 Chapter 2 Fluency and Strategies within 20 25\" width=\"591\" height=\"42\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-25.png 591w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-25-300x21.png 300w\" sizes=\"(max-width: 591px) 100vw, 591px\" \/><br \/>\nAnswer:<br \/>\n11 = 3 + 8\u00a0 \u00a0 \u00a0 \u00a0 8 +3 = 11<br \/>\nExplanation:<br \/>\n<span id=\"P62_28\" class=\"s1 f252 fs9 l0\">Changing the order of the addends <\/span><span id=\"P62_30\" class=\"s1 f252 fs9 l0\">does <\/span><span id=\"P62_31\" class=\"s1 f252 fs9 l0\">not change the<\/span><span id=\"P62_33\" class=\"s1 f253 fs9 l0\">\u00a0<\/span><span id=\"P62_34\" class=\"s1 f253 fs9 l0\">sum.<br \/>\n<\/span>The expressions 3 + 8 and 8 + 3 gives the same sum 11.<\/p>\n<p>Question 7.<br \/>\n<strong>Number Sense<\/strong><br \/>\nComplete each equation.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18833\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-26.png\" alt=\"Big Ideas Math Solutions Grade 2 Chapter 2 Fluency and Strategies within 20 26\" width=\"537\" height=\"143\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-26.png 537w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-26-300x80.png 300w\" sizes=\"(max-width: 537px) 100vw, 537px\" \/><br \/>\nAnswer:<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-48644\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2-Fluency-and-Strategies-within-20-Add-in-Any-Order-Homework-Practice-2.1-Question-7.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2- Fluency-and-Strategies-within-20-Add-in-Any-Order-Homework-Practice-2.1-Question-7\" width=\"537\" height=\"143\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2-Fluency-and-Strategies-within-20-Add-in-Any-Order-Homework-Practice-2.1-Question-7.jpg 537w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2-Fluency-and-Strategies-within-20-Add-in-Any-Order-Homework-Practice-2.1-Question-7-300x80.jpg 300w\" sizes=\"(max-width: 537px) 100vw, 537px\" \/><br \/>\nExplanation:<br \/>\n<span id=\"P62_28\" class=\"s1 f252 fs9 l0\">Changing the order of the addends in the expressions.<\/span><\/p>\n<p>Question 8.<br \/>\n<strong>Modeling Real Life<\/strong><br \/>\nYou have 14 blocks. 8 are cubes. The rest are cylinders. How many cylinders do you have?<br \/>\nWrite two equations that describe your blocks:<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18834\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-27.png\" alt=\"Big Ideas Math Solutions Grade 2 Chapter 2 Fluency and Strategies within 20 27\" width=\"178\" height=\"175\" \/><\/p>\n<p>Answer:<br \/>\nTotal number of Blocks = 14<br \/>\nNumber of cubes = 8.<br \/>\nNumber of Cylinders = total number Blocks &#8211; Number of Cubes<br \/>\n14 &#8211; 8 = 6.<br \/>\nNumber of cylinders = 6<br \/>\nnumber of Cubes + number of Cylinders = total number Blocks<br \/>\n8 + 6 = 14<br \/>\nwhen we reverse the order the expression<br \/>\n6 + 8 = 14<br \/>\nExplanation:<br \/>\nGiven total Blocks = 14<br \/>\nNumber of cubes = 8<br \/>\nFrom the above calculation<br \/>\nNumber of Cylinder = 6<br \/>\nBlocks = number of cubes + number of cylinders<br \/>\n8 + 6 = 14<br \/>\n<span id=\"P62_28\" class=\"s1 f252 fs9 l0\">Changing the order of the addends <\/span><span id=\"P62_30\" class=\"s1 f252 fs9 l0\">does <\/span><span id=\"P62_31\" class=\"s1 f252 fs9 l0\">not change the<\/span><span id=\"P62_33\" class=\"s1 f253 fs9 l0\">\u00a0<\/span><span id=\"P62_34\" class=\"s1 f253 fs9 l0\">sum.<\/span><br \/>\n6 + 8 = 14.<\/p>\n<p>Question 9.<br \/>\n<strong>Modeling Real Life<\/strong><br \/>\nThere are 16 kids in a class. 7 have gone camping. The rest have not. How many kids have not gone camping?<br \/>\nWrite two equations that describe the kids:<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18835\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-28.png\" alt=\"Big Ideas Math Solutions Grade 2 Chapter 2 Fluency and Strategies within 20 28\" width=\"143\" height=\"172\" \/><\/p>\n<p>Answer:<br \/>\nTotal number Kids in the class= 16<br \/>\nNumber of kids gone camping = 7.<br \/>\nNumber of kids who have not gone camping = Total number of kids in the class &#8211; Number of kids gone camping<br \/>\n16 &#8211; 7 = 9.<br \/>\nNumber of kids who have not gone camping = 9<br \/>\nnumber of kids who have gone camping + number of kids who have not gone camping = total number kids in the class<br \/>\n7 + 9 = 16.<br \/>\nwhen we reverse the order the expression<br \/>\n9 + 7 = 16.<br \/>\nExplanation:<br \/>\nGiven total number kids in the class = 16<br \/>\nNumber of kids who have gone camping = 7<br \/>\nFrom the above calculation<br \/>\nNumber of kids who have not gone camping = 9<br \/>\nTotal number kids in the class = number of kids who have gone camping + number of kids who have not gone camping<br \/>\n7 + 9 = 16<br \/>\n<span id=\"P62_28\" class=\"s1 f252 fs9 l0\">Changing the order of the addends <\/span><span id=\"P62_30\" class=\"s1 f252 fs9 l0\">does <\/span><span id=\"P62_31\" class=\"s1 f252 fs9 l0\">not change the<\/span><span id=\"P62_33\" class=\"s1 f253 fs9 l0\">\u00a0<\/span><span id=\"P62_34\" class=\"s1 f253 fs9 l0\">sum.<\/span><br \/>\n9 + 7 = 16.<\/p>\n<p><strong>Review &amp; Refresh<\/strong><\/p>\n<p>Question 10.<br \/>\nWhich time does not belong with the other three?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18836\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-29.png\" alt=\"Big Ideas Math Solutions Grade 2 Chapter 2 Fluency and Strategies within 20 29\" width=\"549\" height=\"129\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-29.png 549w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-29-300x70.png 300w\" sizes=\"(max-width: 549px) 100vw, 549px\" \/><\/p>\n<p>Answer:<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-48650\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2-Fluency-and-Strategies-within-20-Add-in-Any-Order-Homework-Practice-2.1-Review-Refresh-Question-10.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2- Fluency-and-Strategies-within-20-Add-in-Any-Order-Homework-Practice-2.1-Review-&amp;-Refresh-Question-10\" width=\"549\" height=\"129\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2-Fluency-and-Strategies-within-20-Add-in-Any-Order-Homework-Practice-2.1-Review-Refresh-Question-10.jpg 549w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2-Fluency-and-Strategies-within-20-Add-in-Any-Order-Homework-Practice-2.1-Review-Refresh-Question-10-300x70.jpg 300w\" sizes=\"(max-width: 549px) 100vw, 549px\" \/><br \/>\nExplanation:<br \/>\nHalf past 5 means 5:30. In the fig first three images indicate 5:30 where as half past 6 means 6:30.<\/p>\n<h3><a id=\"Lesson_2.2_Use_Doubles\"><\/a>Lesson 2.2 Use Doubles<\/h3>\n<p><strong>Explore and Grow<\/strong><\/p>\n<p>Find each sum. How are the equations alike? How are they different?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18838\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-30.png\" alt=\"Big Ideas Math Solutions Grade 2 Chapter 2 Fluency and Strategies within 20 30\" width=\"536\" height=\"620\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-30.png 536w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-30-259x300.png 259w\" sizes=\"(max-width: 536px) 100vw, 536px\" \/><\/p>\n<p>Answer:<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-48653\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.2-Use-Doubles-Explore-and-Grow.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2- Fluency-and-Strategies-within-20-Lesson-2.2-Use-Doubles-Explore-and-Grow\" width=\"536\" height=\"620\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.2-Use-Doubles-Explore-and-Grow.jpg 536w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.2-Use-Doubles-Explore-and-Grow-259x300.jpg 259w\" sizes=\"(max-width: 536px) 100vw, 536px\" \/><\/p>\n<p>Explanation:<br \/>\nFirst two expressions are double. 6 + 6, 7 + 7<br \/>\nIn the next\u00a0 two expression<br \/>\none is doubles plus 1 expression 6 + 7.<br \/>\nsecond is doubles minus 1 expression 7 + 6.<\/p>\n<p><strong>Show and Grow<\/strong><\/p>\n<p>Find the sum. Write the double you used.<\/p>\n<p>Question 1.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18839\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-31.png\" alt=\"Big Ideas Math Solutions Grade 2 Chapter 2 Fluency and Strategies within 20 31\" width=\"267\" height=\"86\" \/><br \/>\nAnswer:<br \/>\n4 + 5 = 9<br \/>\n4 + 4 = 8<br \/>\nExplanation:<br \/>\nDoubles plus 1<br \/>\n4 + 5 is equal to 4 + 4 and 1 more.<\/p>\n<p>Question 2.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18840\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-32.png\" alt=\"Big Ideas Math Solutions Grade 2 Chapter 2 Fluency and Strategies within 20 32\" width=\"263\" height=\"93\" \/><br \/>\nAnswer:<br \/>\n7 + 6 = 13<br \/>\n7 + 7 = 14<br \/>\nExplanation:<br \/>\nDoubles minus 1<br \/>\n7 + 6 is equal to 1 less than 7 + 7.<\/p>\n<p>Question 3.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18841\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-33.png\" alt=\"Big Ideas Math Solutions Grade 2 Chapter 2 Fluency and Strategies within 20 33\" width=\"240\" height=\"177\" \/><\/p>\n<p>Answer:<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-48695\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.2-Use-Doubles-Show-and-Grow-Question-3.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2- Fluency-and-Strategies-within-20-Lesson-2.2-Use-Doubles-Show-and-Grow-Question-3\" width=\"240\" height=\"177\" \/><\/p>\n<p>Explanation:<br \/>\nDoubles minus 1<br \/>\n6 + 5 is equal to 1 less than 6 + 6.<\/p>\n<p>Question 4.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18842\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-34.png\" alt=\"Big Ideas Math Solutions Grade 2 Chapter 2 Fluency and Strategies within 20 34\" width=\"233\" height=\"179\" \/><\/p>\n<p>Answer:<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-48696\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.2-Use-Doubles-Show-and-Grow-Question-4.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2- Fluency-and-Strategies-within-20-Lesson-2.2-Use-Doubles-Show-and-Grow-Question-4\" width=\"233\" height=\"179\" \/><br \/>\nExplanation:<br \/>\nDoubles plus 1<br \/>\n8 + 9\u00a0 is equal to 8 + 8 and 1 more.<\/p>\n<p><strong>Apply and Grow: Practice<\/strong><\/p>\n<p>Question 5.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18843\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-35.png\" alt=\"Big Ideas Math Solutions Grade 2 Chapter 2 Fluency and Strategies within 20 35\" width=\"240\" height=\"172\" \/><br \/>\nAnswer:<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-48697\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.2-Use-Doubles-Apply-and-Grow-Practice-Question-5.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2- Fluency-and-Strategies-within-20-Lesson-2.2-Use-Doubles-Apply-and-Grow-Practice-Question-5\" width=\"240\" height=\"172\" \/><br \/>\nExplanation:<br \/>\nDoubles plus 1<br \/>\n3 + 4 is equal to 3 + 3 and 1 more<\/p>\n<p>Question 6.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18844\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-36.png\" alt=\"Big Ideas Math Solutions Grade 2 Chapter 2 Fluency and Strategies within 20 36\" width=\"236\" height=\"179\" \/><br \/>\nAnswer:<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-48698\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.2-Use-Doubles-Apply-and-Grow-Practice-Question-6.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2- Fluency-and-Strategies-within-20-Lesson-2.2-Use-Doubles-Apply-and-Grow-Practice-Question-6\" width=\"236\" height=\"179\" \/><br \/>\nExplanation:<br \/>\nDoubles minus 1<br \/>\n8 + 7 is equal to 1 less than 8 + 8<\/p>\n<p>Question 7.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18846\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-37.png\" alt=\"Big Ideas Math Solutions Grade 2 Chapter 2 Fluency and Strategies within 20 37\" width=\"238\" height=\"175\" \/><\/p>\n<p>Answer:<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-48699\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.2-Use-Doubles-Apply-and-Grow-Practice-Question-7.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2- Fluency-and-Strategies-within-20-Lesson-2.2-Use-Doubles-Apply-and-Grow-Practice-Question-7\" width=\"238\" height=\"175\" \/><br \/>\nExplanation:<br \/>\nDoubles plus 1<br \/>\n5 + 6 is equal to 1 less than 5 + 5.<\/p>\n<p>Question 8.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18847\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-38.png\" alt=\"Big Ideas Math Solutions Grade 2 Chapter 2 Fluency and Strategies within 20 38\" width=\"241\" height=\"179\" \/><br \/>\nAnswer:<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-48700\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.2-Use-Doubles-Apply-and-Grow-Practice-Question-8.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2- Fluency-and-Strategies-within-20-Lesson-2.2-Use-Doubles-Apply-and-Grow-Practice-Question-8\" width=\"241\" height=\"179\" \/><br \/>\nExplanation:<br \/>\nDoubles minus 1<br \/>\n10 +9 is equal to 1 less than 10 + 10.<\/p>\n<p>Question 9.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18848\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-39.png\" alt=\"Big Ideas Math Solutions Grade 2 Chapter 2 Fluency and Strategies within 20 39\" width=\"255\" height=\"85\" \/><br \/>\nAnswer:<br \/>\n2 + 3 = 5<br \/>\n2 + 2 = 4<br \/>\nExplanation:<br \/>\nDoubles plus 1<br \/>\n2 + 3 is equal to 2+2 and 1 more.<\/p>\n<p>Question 10.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18849\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-40.png\" alt=\"Big Ideas Math Solutions Grade 2 Chapter 2 Fluency and Strategies within 20 40\" width=\"262\" height=\"85\" \/><\/p>\n<p>Answer:<br \/>\n5 + 4 = 9<br \/>\n5 + 5 = 10<br \/>\nExplanation:<br \/>\n5 + 4 is equal 1 less than 5 + 5.<br \/>\nDoubles minus 1.<\/p>\n<p>Question 11.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18850\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-41.png\" alt=\"Big Ideas Math Solutions Grade 2 Chapter 2 Fluency and Strategies within 20 41\" width=\"264\" height=\"84\" \/><\/p>\n<p>Answer:<br \/>\n6 + 7 = 13<br \/>\n6 + 6 = 12<br \/>\nExplanation:<br \/>\n6 + 7\u00a0 is equal to 6 + 6 and 1 more.<br \/>\nDoubles plus 1.<\/p>\n<p>Question 12.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18851\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-42.png\" alt=\"Big Ideas Math Solutions Grade 2 Chapter 2 Fluency and Strategies within 20 42\" width=\"256\" height=\"86\" \/><br \/>\nAnswer:<br \/>\n9 + 8 = 17<br \/>\n9 + 9 = 18<br \/>\nExplanation:<br \/>\n9 + 8 is equal 1 less than 9 + 9.<br \/>\nDoubles minus 1.<\/p>\n<p>Question 13.<br \/>\n<strong>DIG DEEPER!<\/strong><br \/>\nWhat double might Newton be thinking?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18852\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-43.png\" alt=\"Big Ideas Math Solutions Grade 2 Chapter 2 Fluency and Strategies within 20 43\" width=\"571\" height=\"165\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-43.png 571w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-43-300x87.png 300w\" sizes=\"(max-width: 571px) 100vw, 571px\" \/><br \/>\nAnswer:<br \/>\nGiven<br \/>\nSum greater than 4<br \/>\nAddends less than 5<br \/>\nAs per the above information the doubles can be 3 + 3, 4 + 4.<br \/>\n<strong>Think and Grow: Modeling Real Life<\/strong><\/p>\n<p>You make 9 mud pies. Your friend makes 1 fewer than you. How many mud pies do you and your friend make in all?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18853\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-44.png\" alt=\"Big Ideas Math Solutions Grade 2 Chapter 2 Fluency and Strategies within 20 44\" width=\"223\" height=\"123\" \/><br \/>\nAddition equation:<br \/>\nWhat double can you use?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18854\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-45.png\" alt=\"Big Ideas Math Solutions Grade 2 Chapter 2 Fluency and Strategies within 20 45\" width=\"283\" height=\"84\" \/><br \/>\nAnswer:<br \/>\nNumber of mud pies i make = 9<br \/>\nMy friend makes 1 fewer mud pies then me = 9- 1 = 8<br \/>\nTotal number of Mud pies we both make = 9 + 8 = 17.<br \/>\nDouble<br \/>\n9 + 9 = 18.<br \/>\n9 + 8 is 1 less than 9 + 9<br \/>\nDoubles minus 1.<\/p>\n<p><strong>Show and Grow<\/strong><\/p>\n<p>Question 14.<br \/>\nYou score 6 goals. Your friend scores 1 more than you. How many goals do you and your friend score in all?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18855\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-46.png\" alt=\"Big Ideas Math Solutions Grade 2 Chapter 2 Fluency and Strategies within 20 46\" width=\"212\" height=\"203\" \/><br \/>\nAnswer:<br \/>\nNumber of goals i scored = 6<br \/>\nNumber of goals my friend scored = 6 + 1 = 7<br \/>\nTotal number of goals we both scored = 6 + 7 = 13.<\/p>\n<p>Question 15.<br \/>\n<strong>DIG DEEPER!<\/strong><br \/>\nYou and your friend jump in 13 puddles in all. You jump in 7. How many puddles does your friend jump in?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18856\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-47.png\" alt=\"Big Ideas Math Solutions Grade 2 Chapter 2 Fluency and Strategies within 20 47\" width=\"189\" height=\"193\" \/><br \/>\nAnswer:<br \/>\nTotal number of puddles me and my friend jumped = 13<br \/>\nTotal number of puddles i jumped = 7<br \/>\nNumber of puddles my friend jumped = 13 &#8211; 7 = 6.<br \/>\n7 + 6 = 13.<\/p>\n<h3><a id=\"Use_Doubles_Homework_&amp;_Practice_2.2\"><\/a>Use Doubles Homework &amp; Practice 2.2<\/h3>\n<p>Find the sum. Write the double you used.<\/p>\n<p>Question 1.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18858\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-48.png\" alt=\"Big Ideas Math Solutions Grade 2 Chapter 2 Fluency and Strategies within 20 48\" width=\"258\" height=\"92\" \/><br \/>\nAnswer:<br \/>\n4 + 3 = 7<br \/>\n4 + 4 = 8<br \/>\nExplanation:<br \/>\nDoubles minus 1<br \/>\n4 + 3 is equal to 1 less than 4 + 4.<br \/>\nQuestion 2.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18765\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-49.png\" alt=\"Big Ideas Math Answers Grade 2 Chapter 2 Fluency and Strategies within 20 49\" width=\"264\" height=\"91\" \/><br \/>\nAnswer:<br \/>\n5 + 6 = 11<br \/>\nDoubles 5 + 5 = 10<br \/>\nExplanation:<br \/>\nDoubles plus 1<br \/>\n5 + 6 is equal to 5 + 5 and 1 more<\/p>\n<p>Question 3.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18766\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-50.png\" alt=\"Big Ideas Math Answers Grade 2 Chapter 2 Fluency and Strategies within 20 50\" width=\"238\" height=\"176\" \/><br \/>\nAnswer:<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-48701\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2-Fluency-and-Strategies-within-20-Use-Doubles-Homework-Practice-2.2-Question-3.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2- Fluency-and-Strategies-within-20-Use-Doubles- Homework-&amp;-Practice-2.2-Question-3\" width=\"238\" height=\"176\" \/><br \/>\nExplanation:<br \/>\nDoubles minus 1<br \/>\n9 + 8 is equal to 1 less than 9 + 9<\/p>\n<p>Question 4.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18767\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-51.png\" alt=\"Big Ideas Math Answers Grade 2 Chapter 2 Fluency and Strategies within 20 51\" width=\"239\" height=\"177\" \/><br \/>\nAnswer:<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-48702\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2-Fluency-and-Strategies-within-20-Use-Doubles-Homework-Practice-2.2-Question-4.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-Key-Chapter-2- Fluency-and-Strategies-within-20-Use-Doubles- Homework-&amp;-Practice-2.2-Question-4\" width=\"239\" height=\"177\" \/><br \/>\nExplanation:<br \/>\n6 + 7 is equal to 6 + 6 and 1 more.<br \/>\nDoubles plus 1.<\/p>\n<p>Question 5.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18859\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Solutions-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-52.png\" alt=\"Big Ideas Math Solutions Grade 2 Chapter 2 Fluency and Strategies within 20 52\" width=\"268\" height=\"96\" \/><br \/>\nAnswer:<br \/>\n8 + 7 = 15<br \/>\n8 + 8 = 16<br \/>\nExplanation:<br \/>\n8 + 7 is equal to 1 less than 8 + 8.<br \/>\nDoubles minus 1.<\/p>\n<p>Question 6.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18768\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-53.png\" alt=\"Big Ideas Math Answers Grade 2 Chapter 2 Fluency and Strategies within 20 53\" width=\"258\" height=\"92\" \/><\/p>\n<p>Answer:<br \/>\n9 + 10 = 19<br \/>\n9 + 9 = 18<br \/>\nExplanation:<br \/>\nDoubles plus 1<br \/>\n9 + 10 is equal to 9 + 9 and 1 more.<\/p>\n<p>Question 7.<br \/>\n<strong>Number Sense<\/strong><br \/>\nWhich doubles can you use to \ufb01nd 8 + 9?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18769\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-54.png\" alt=\"Big Ideas Math Answers Grade 2 Chapter 2 Fluency and Strategies within 20 54\" width=\"504\" height=\"55\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-54.png 504w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-54-300x33.png 300w\" sizes=\"(max-width: 504px) 100vw, 504px\" \/><br \/>\nAnswer:<br \/>\nTo find the expression 8 + 9<br \/>\n8 + 9 is equal to 8 + 8 and 1 more<br \/>\n8 +9 is equal to 1 less than 9 + 9.<\/p>\n<p>Question 8.<br \/>\n<strong>Modeling Real Life<\/strong><br \/>\nYou tell 5 jokes. Your friend tells 1 fewer than you. How many jokes do you and your friend tell in all?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18770\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-55.png\" alt=\"Big Ideas Math Answers Grade 2 Chapter 2 Fluency and Strategies within 20 55\" width=\"139\" height=\"205\" \/><br \/>\nAnswer:<br \/>\nNumber of jokes i told = 5<br \/>\nNumber of jokes my friend told = 5 &#8211; 1 = 4<br \/>\nTotal number of jokes me and my friend told in together = 5 + 4 = 9<br \/>\n9 jokes together.<\/p>\n<p>Question 9.<br \/>\n<strong>Modeling Real Life<\/strong><br \/>\nNewton paints 3 paw prints. Descartes paints 1 more than Newton. How many paw prints do they paint in all?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18772\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-56.png\" alt=\"Big Ideas Math Answers Grade 2 Chapter 2 Fluency and Strategies within 20 56\" width=\"218\" height=\"214\" \/><br \/>\nAnswer:<br \/>\nNumber of paw prints by Newton paints = 3<br \/>\nNumber of paw prints by Descartes paints is 1 more than newton = 3 + 1 = 4<br \/>\nTotal number of paw prints both Newton and Descartes paint =3 + 4 = 7<br \/>\nTotal 7 paw prints.<\/p>\n<p><strong>Review &amp; Refresh<\/strong><\/p>\n<p>Is the equation true or false?<\/p>\n<p>Question 10.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18773\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-57.png\" alt=\"Big Ideas Math Answers Grade 2 Chapter 2 Fluency and Strategies within 20 57\" width=\"203\" height=\"154\" \/><br \/>\nAnswer:<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-49560\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Use-Doubles-Homework-Practice-2.2-Review-Refresh-Question-10.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Use-Doubles-Homework-&amp;-Practice-2.2-Review-&amp;-Refresh-Question-10\" width=\"203\" height=\"154\" \/><\/p>\n<p>Question 11.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18774\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-58.png\" alt=\"Big Ideas Math Answers Grade 2 Chapter 2 Fluency and Strategies within 20 58\" width=\"205\" height=\"157\" \/><br \/>\nAnswer:<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-49561\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Use-Doubles-Homework-amp-Practice-2.2-Review-amp-Refresh-Question-11.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Use-Doubles-Homework-&amp;-Practice-2.2-Review-&amp;-Refresh-Question-11\" width=\"205\" height=\"157\" \/><\/p>\n<h3><a id=\"Lesson_2.3_Add_Three_Numbers\"><\/a>Lesson 2.3 Add Three Numbers<\/h3>\n<p><strong>Explore and Grow<\/strong><\/p>\n<p>Find the sums.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18775\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-59.png\" alt=\"Big Ideas Math Answers Grade 2 Chapter 2 Fluency and Strategies within 20 59\" width=\"262\" height=\"408\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-59.png 262w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-59-193x300.png 193w\" sizes=\"(max-width: 262px) 100vw, 262px\" \/><br \/>\nWhat is the same? What is different?<br \/>\n_________________________<br \/>\n_________________________<br \/>\n_________________________<br \/>\nAnswer:<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-49562\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.3-Add-Three-Numbers-Explore-and-Grow.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.3-Add-Three-Numbers-Explore-and-Grow\" width=\"321\" height=\"415\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.3-Add-Three-Numbers-Explore-and-Grow.jpg 321w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.3-Add-Three-Numbers-Explore-and-Grow-232x300.jpg 232w\" sizes=\"(max-width: 321px) 100vw, 321px\" \/><br \/>\nThe sum remains same.<br \/>\nThe difference is the order of the addends added.<br \/>\nExplanation:<br \/>\nChanging the order of addends does not change the sum.<br \/>\nIn all the three expressions the sum is same :14<\/p>\n<p><strong>Show and Grow<\/strong><\/p>\n<p>Circle two addends to add \ufb01rst. Write their sum. Then \ufb01nd the sum of all three addends.<\/p>\n<p>Question 1.<br \/>\n7 + 3 + 4 = ___<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18776\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-60.png\" alt=\"Big Ideas Math Answers Grade 2 Chapter 2 Fluency and Strategies within 20 60\" width=\"70\" height=\"75\" \/><br \/>\nAnswer:<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-49573\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.3-Add-Three-Numbers-Show-and-Grow-Question-1.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.3-Add-Three-Numbers-Show-and-Grow-Question-1\" width=\"207\" height=\"151\" \/><br \/>\nExplanation:<br \/>\nAddends are represented in circle and Sum is represented in square.<br \/>\nFirst adding two addends 7, 4 give the sum 11<br \/>\nand then adding the another addend 3 to the sum 11.<br \/>\nGives the sum 14.<\/p>\n<p>Question 2.<br \/>\n1 + 5 + 3 = ___<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18777\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-61.png\" alt=\"Big Ideas Math Answers Grade 2 Chapter 2 Fluency and Strategies within 20 61\" width=\"78\" height=\"67\" \/><br \/>\nAnswer:<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-49574\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.3-Add-Three-Numbers-Show-and-Grow-Question-2.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.3-Add-Three-Numbers-Show-and-Grow-Question-2\" width=\"181\" height=\"258\" \/><br \/>\nExplanation:<br \/>\nAddends are represented in circle and Sum is represented in square.<br \/>\nFirst adding two addends 1 , 5 give the sum 6.<br \/>\nand then adding the another addend 3 to the sum 6.<br \/>\nGives the sum 9.<\/p>\n<p>Question 3.<br \/>\n9 + 4 + 4 = ___<br \/>\nAnswer:<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-49576\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.3-Add-Three-Numbers-Show-and-Grow-Question-3.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.3-Add-Three-Numbers-Show-and-Grow-Question-3\" width=\"191\" height=\"236\" \/><br \/>\nExplanation:<br \/>\nAddends are represented in circle and Sum is represented in square.<br \/>\nFirst adding two addends 4, 4 give the sum 8.<br \/>\nand then adding the another addend 9 to the sum 8.<br \/>\nGives the sum 17.<\/p>\n<p>Question 4.<br \/>\n5 + 2 + 5 = ___<br \/>\nAnswer:<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-49577\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.3-Add-Three-Numbers-Show-and-Grow-Question-4.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.3-Add-Three-Numbers-Show-and-Grow-Question-4\" width=\"170\" height=\"258\" \/><br \/>\nExplanation:<br \/>\nAddends are represented in circle and Sum is represented in square.<br \/>\nFirst adding two addends 5, 2 give the sum 7.<br \/>\nand then adding the another addend 5 to the sum 7.<br \/>\nGives the sum 12.<\/p>\n<p><strong>Apply and Grow: Practice<\/strong><\/p>\n<p>Question 5.<br \/>\n3 + 5 + 5 = ___<br \/>\nAnswer:<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-49578\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.3-Add-Three-Numbers-Apply-and-Grow-Practice-Question-5.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.3-Add-Three-Numbers-Apply-and-Grow-Practice-Question-5\" width=\"199\" height=\"251\" \/><br \/>\nExplanation:<br \/>\nAddends are represented in circle and Sum is represented in square.<br \/>\nFirst adding two addends 5, 2 give the sum 7.<br \/>\nand then adding the another addend 5 to the sum 7.<br \/>\nGives the sum 12.<\/p>\n<p>Question 6.<br \/>\n9 + 0 + 7 = ___<br \/>\nAnswer:<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-49579\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.3-Add-Three-Numbers-Apply-and-Grow-Practice-Question-6.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.3-Add-Three-Numbers-Apply-and-Grow-Practice-Question-6\" width=\"185\" height=\"254\" \/><br \/>\nExplanation:<br \/>\nAddends are represented in circle and Sum is represented in square.<br \/>\nFirst adding two addends 9, 0 give the sum 9.<br \/>\nand then adding the another addend 7 to the sum 9.<br \/>\nGives the sum 16.<\/p>\n<p>Question 7.<br \/>\n4 + 2 + 3 = ___<br \/>\nAnswer:<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-49580\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.3-Add-Three-Numbers-Apply-and-Grow-Practice-Question-7.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.3-Add-Three-Numbers-Apply-and-Grow-Practice-Question-7\" width=\"196\" height=\"244\" \/><br \/>\nExplanation:<br \/>\nAddends are represented in circle and Sum is represented in square.<br \/>\nFirst adding two addends 2, 3 give the sum 5.<br \/>\nand then adding the another addend 4 to the sum 5.<br \/>\nGives the sum 9.<\/p>\n<p>Question 8.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18778\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-62.png\" alt=\"Big Ideas Math Answers Grade 2 Chapter 2 Fluency and Strategies within 20 62\" width=\"121\" height=\"166\" \/><br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-49723\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.3-Add-Three-Numbers-Question-8.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.3-Add-Three-Numbers-Question-8\" width=\"127\" height=\"187\" \/><\/p>\n<p>Question 9.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18779\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-63.png\" alt=\"Big Ideas Math Answers Grade 2 Chapter 2 Fluency and Strategies within 20 63\" width=\"120\" height=\"161\" \/><br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-49725\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.3-Add-Three-Numbers-Question-9.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.3-Add-Three-Numbers-Question-9\" width=\"127\" height=\"187\" \/><\/p>\n<p>Question 10.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18780\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-64.png\" alt=\"Big Ideas Math Answers Grade 2 Chapter 2 Fluency and Strategies within 20 64\" width=\"117\" height=\"158\" \/><br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-49726\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.3-Add-Three-Numbers-Question-10.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.3-Add-Three-Numbers-Question-10\" width=\"127\" height=\"187\" \/><\/p>\n<p>Question 11.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18781\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-65.png\" alt=\"Big Ideas Math Answers Grade 2 Chapter 2 Fluency and Strategies within 20 65\" width=\"188\" height=\"57\" \/><br \/>\nAnswer :<br \/>\n9 + 5 + 6 = 20<\/p>\n<p>Question 12.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18783\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-66.png\" alt=\"Big Ideas Math Answers Grade 2 Chapter 2 Fluency and Strategies within 20 66\" width=\"116\" height=\"161\" \/><br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-49727\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.3-Add-Three-Numbers-Question-12.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.3-Add-Three-Numbers-Question-12\" width=\"127\" height=\"187\" \/><\/p>\n<p>Question 13.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18784\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-67.png\" alt=\"Big Ideas Math Answers Grade 2 Chapter 2 Fluency and Strategies within 20 67\" width=\"190\" height=\"57\" \/><br \/>\nAnswer :<br \/>\n3 + 7 + 7 = 17<br \/>\nExplanation:<br \/>\nAddends are represented in circle and Sum is represented in square.<br \/>\nFirst adding two addends 5, 2 give the sum 7.<br \/>\nand then adding the another addend 5 to the sum 7.<br \/>\nGives the sum 12.<\/p>\n<p>Question 14.<br \/>\n<strong>Structure<\/strong><br \/>\nWrite the missing addends.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18785\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-68.png\" alt=\"Big Ideas Math Answers Grade 2 Chapter 2 Fluency and Strategies within 20 68\" width=\"600\" height=\"163\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-68.png 600w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-68-300x82.png 300w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-49728\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.3-Add-Three-Numbers-Question-14.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.3-Add-Three-Numbers-Question-14\" width=\"600\" height=\"187\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.3-Add-Three-Numbers-Question-14.jpg 600w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.3-Add-Three-Numbers-Question-14-300x94.jpg 300w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><\/p>\n<p><strong>Think and Grow: Modeling Real Life<\/strong><\/p>\n<p>You have 6 presents. Newton and Descartes each have 4 presents. How many presents are there in all?<br \/>\nAddition equation:<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18787\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-69.png\" alt=\"Big Ideas Math Answers Grade 2 Chapter 2 Fluency and Strategies within 20 69\" width=\"166\" height=\"187\" \/><br \/>\nAnswer :<br \/>\nNumber of presents with me = 6<br \/>\nNumber of presents with Newton = 4<br \/>\nNumber of Presents with Descartes = 4<br \/>\nTotal Number of presents in all = 6 + 4 + 4 = 14<\/p>\n<p><strong>Show and Grow<\/strong><\/p>\n<p>Question 15.<br \/>\nYou have 8 crayons. Newton and Descartes each have 5 crayons. How many crayons are there in all?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18788\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-70.png\" alt=\"Big Ideas Math Answers Grade 2 Chapter 2 Fluency and Strategies within 20 70\" width=\"172\" height=\"171\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-70.png 172w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-70-150x150.png 150w\" sizes=\"(max-width: 172px) 100vw, 172px\" \/><br \/>\nAnswer :<br \/>\nNumber of Crayons with me = 8<br \/>\nNumber of Crayons with Newton = 5<br \/>\nNumber of Crayons with Descartes = 5<br \/>\nTotal Number of Crayons in all = 8 + 5 + 5 = 18<\/p>\n<p>Question 16.<br \/>\nYou, Newton, and Descartes eat 18 apple slices in all. Newton and Descartes each eat 6 slices. How many apple slices do you eat?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18789\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-71.png\" alt=\"Big Ideas Math Answers Grade 2 Chapter 2 Fluency and Strategies within 20 71\" width=\"203\" height=\"147\" \/><br \/>\nAnswer :<br \/>\nNumber of apples slices eaten by Me , Newton and Descartes = 18<br \/>\nNumber of apples eaten by Newton =6<br \/>\nNumber of apples eaten by Descartes = 6<br \/>\nTotal Number of apples eaten by Newton and Descartes = 6 + 6 = 12<br \/>\nNumber of apple slices eaten by me = 18 &#8211; 12 = 6<\/p>\n<p>Question 17.<br \/>\nA treasure chest has 20 jewels in all. 7 are blue. 6 are green. The rest are red. How many jewels are red?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18791\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-72.png\" alt=\"Big Ideas Math Answers Grade 2 Chapter 2 Fluency and Strategies within 20 72\" width=\"216\" height=\"171\" \/><br \/>\nAnswer :<br \/>\nNumber of jewels in Treasure chest = 20<br \/>\nNumber of blue jewels = 7<br \/>\nNumber of green jewels = 6<br \/>\nNumber of blue and green jewels = 7 + 6 = 13<br \/>\nNumber of red jewels = 20 &#8211; 13 = 7<\/p>\n<h3><a id=\"Add_Three_Numbers_Homework_&amp;_Practice_2.3\"><\/a>Add Three Numbers Homework &amp; Practice 2.3<\/h3>\n<p>Circle two addends to add \ufb01rst. Write their sum. Then \ufb01nd the sum of all three addends.<\/p>\n<p>Question 1.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18793\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-73.png\" alt=\"Big Ideas Math Answers Grade 2 Chapter 2 Fluency and Strategies within 20 73\" width=\"191\" height=\"109\" \/><br \/>\nAnswer :<br \/>\n2 + 5 + 1 = 8<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-49733\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Add-Three-Numbers-Homework-Practice-2.3-Question-1.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Add-Three-Numbers-Homework-Practice-2.3-Question-1\" width=\"205\" height=\"244\" \/><br \/>\nExplanation:<br \/>\nAddends are represented in circle and Sum is represented in square.<br \/>\nFirst adding two addends 5, 1 give the sum 6.<br \/>\nand then adding the another addend 2 to the sum 6.<br \/>\nGives the sum 8.<\/p>\n<p>Question 2.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18794\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-74.png\" alt=\"Big Ideas Math Answers Grade 2 Chapter 2 Fluency and Strategies within 20 74\" width=\"192\" height=\"102\" \/><br \/>\nAnswer<br \/>\n6 + 4 + 4 = 14<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-49734\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Add-Three-Numbers-Homework-Practice-2.3-Question-2.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Add-Three-Numbers-Homework-Practice-2.3-Question-2\" width=\"205\" height=\"243\" \/><br \/>\nExplanation:<br \/>\nAddends are represented in circle and Sum is represented in square.<br \/>\nFirst adding two addends 4, 4 give the sum 8.<br \/>\nand then adding the another addend 6 to the sum 8.<br \/>\nGives the sum 14.<\/p>\n<p>Question 3.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18795\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-75.png\" alt=\"Big Ideas Math Answers Grade 2 Chapter 2 Fluency and Strategies within 20 75\" width=\"195\" height=\"108\" \/><br \/>\nAnswer :<br \/>\n0 + 8 + 7 = 15<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-49735\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Add-Three-Numbers-Homework-Practice-2.3-Question-3.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Add-Three-Numbers-Homework-Practice-2.3-Question-3\" width=\"205\" height=\"243\" \/><br \/>\nExplanation:<br \/>\nAddends are represented in circle and Sum is represented in square.<br \/>\nFirst adding two addends 8, 7 give the sum 15.<br \/>\nand then adding the another addend 0 to the sum 15.<br \/>\nGives the sum 15.<\/p>\n<p>Question 4.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18796\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-76.png\" alt=\"Big Ideas Math Answers Grade 2 Chapter 2 Fluency and Strategies within 20 76\" width=\"169\" height=\"159\" \/><br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-49736\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Add-Three-Numbers-Homework-Practice-2.3-Question-4-1.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Add-Three-Numbers-Homework-Practice-2.3-Question-4\" width=\"169\" height=\"187\" \/><br \/>\nExplanation:<br \/>\nAddends are represented in circle and Sum is represented in square.<br \/>\nFirst adding two addends 6, 5 give the sum 11.<br \/>\nand then adding the another addend 5 to the sum 11.<br \/>\nGives the sum 11.<\/p>\n<p>Question 5.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18797\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-77.png\" alt=\"Big Ideas Math Answers Grade 2 Chapter 2 Fluency and Strategies within 20 77\" width=\"164\" height=\"157\" \/><br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-49731\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Add-Three-Numbers-Homework-Practice-2.3-Question-5.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Add-Three-Numbers-Homework-Practice-2.3-Question-5\" width=\"164\" height=\"187\" \/><br \/>\nExplanation:<br \/>\nAddends are represented in circle and Sum is represented in square.<br \/>\nFirst adding two addends 4, 9 give the sum 13.<br \/>\nand then adding the another addend 0 to the sum 13.<br \/>\nGives the sum 13.<\/p>\n<p>Question 6.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18798\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-78.png\" alt=\"Big Ideas Math Answers Grade 2 Chapter 2 Fluency and Strategies within 20 78\" width=\"177\" height=\"153\" \/><\/p>\n<p>Answer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-49732\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Add-Three-Numbers-Homework-Practice-2.3-Question-6.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Add-Three-Numbers-Homework-Practice-2.3-Question-6\" width=\"177\" height=\"187\" \/><br \/>\nExplanation:<br \/>\nAddends are represented in circle and Sum is represented in square.<br \/>\nFirst adding two addends 3, 3 give the sum 6.<br \/>\nand then adding the another addend 3 to the sum 6.<br \/>\nGives the sum 9.<\/p>\n<p>Question 7.<br \/>\n2 + 8 + 7 = ___<br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-49737\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Add-Three-Numbers-Homework-Practice-2.3-Question-7.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Add-Three-Numbers-Homework-Practice-2.3-Question-7\" width=\"205\" height=\"243\" \/><br \/>\nExplanation:<br \/>\nAddends are represented in circle and Sum is represented in square.<br \/>\nFirst adding two addends 8, 7 give the sum 15.<br \/>\nand then adding the another addend 2 to the sum 15.<br \/>\nGives the sum 17.<\/p>\n<p>Question 8.<br \/>\n9 + 8 + 1 = ___<br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-49738\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Add-Three-Numbers-Homework-Practice-2.3-Question-8.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Add-Three-Numbers-Homework-Practice-2.3-Question-8\" width=\"205\" height=\"243\" \/><br \/>\nExplanation:<br \/>\nAddends are represented in circle and Sum is represented in square.<br \/>\nFirst adding two addends 8, 1 give the sum 9.<br \/>\nand then adding the another addend 9 to the sum 9.<br \/>\nGives the sum 18.<\/p>\n<p>Question 9.<br \/>\n8 + 7 + 5 = ___<br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-49739\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Add-Three-Numbers-Homework-Practice-2.3-Question-9.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Add-Three-Numbers-Homework-Practice-2.3-Question-9\" width=\"205\" height=\"243\" \/><br \/>\nExplanation:<br \/>\nAddends are represented in circle and Sum is represented in square.<br \/>\nFirst adding two addends 7, 5 give the sum 12.<br \/>\nand then adding the another addend 8 to the sum 12.<br \/>\nGives the sum 20.<\/p>\n<p>Question 10.<br \/>\n<strong>DIG DEEPER!<\/strong><br \/>\nComplete the number puzzle so that each branch has a sum of 20.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18799\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-79.png\" alt=\"Big Ideas Math Answers Grade 2 Chapter 2 Fluency and Strategies within 20 79\" width=\"635\" height=\"250\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-79.png 635w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-79-300x118.png 300w\" sizes=\"(max-width: 635px) 100vw, 635px\" \/><br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-49740\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Add-Three-Numbers-Homework-Practice-2.3-Question-10.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Add-Three-Numbers-Homework-Practice-2.3-Question-10\" width=\"602\" height=\"237\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Add-Three-Numbers-Homework-Practice-2.3-Question-10.jpg 602w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Add-Three-Numbers-Homework-Practice-2.3-Question-10-300x118.jpg 300w\" sizes=\"(max-width: 602px) 100vw, 602px\" \/><br \/>\nExplanation :<br \/>\nSum should be 20<br \/>\n8 + ____ + 7 = 20\u00a0 so , _____= 20 &#8211; 15 = 5<br \/>\n10 + ____ + 10 = 20 so , _______ = 20 &#8211; 20 = 0<br \/>\n_____ +\u00a0 3 + 9 = 20 so , _____ = 20 &#8211; 12 = 8<br \/>\n4 + 7 + _____ = 20 so, _____ = 20 &#8211; 11 = 9<\/p>\n<p>Question 11.<br \/>\n<strong>Modeling Real Life<\/strong><br \/>\nYou, Newton, and Descartes have 17 stampers in all. Newton and Descartes each have 6. How many stampers do you have? <img loading=\"lazy\" class=\"alignnone size-full wp-image-18800\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-80.png\" alt=\"Big Ideas Math Answers Grade 2 Chapter 2 Fluency and Strategies within 20 80\" width=\"196\" height=\"216\" \/><br \/>\nAnswer :<br \/>\nNumber of stampers with me , Newton and Descartes = 17<br \/>\nNumber of Stampers with Newton = 6<br \/>\nNumber of stampers with Descartes = 6<br \/>\nTotal Number of stampers with Newton and Descartes = 6 + 6 = 12<br \/>\nNumber of Stampers with me = 17 &#8211; 12 = 5 Stampers<\/p>\n<p>Question 12.<br \/>\nMake a quick sketch. Complete the sentences.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18801\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-81.png\" alt=\"Big Ideas Math Answers Grade 2 Chapter 2 Fluency and Strategies within 20 81\" width=\"555\" height=\"194\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-81.png 555w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-81-300x105.png 300w\" sizes=\"(max-width: 555px) 100vw, 555px\" \/><br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-49741\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Add-Three-Numbers-Homework-Practice-2.3-Question-12.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Add-Three-Numbers-Homework-Practice-2.3-Question-12\" width=\"555\" height=\"194\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Add-Three-Numbers-Homework-Practice-2.3-Question-12.jpg 555w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Add-Three-Numbers-Homework-Practice-2.3-Question-12-300x105.jpg 300w\" sizes=\"(max-width: 555px) 100vw, 555px\" \/><\/p>\n<h3><a id=\"Lesson_2.4_Make_a_10_to_Add\"><\/a>Lesson 2.4 Make a 10 to Add<\/h3>\n<p><strong>Explore and Grow<\/strong><\/p>\n<p>Use counters and the ten frames to \ufb01nd the sum. How can you make a 10 to solve?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18802\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-82.png\" alt=\"Big Ideas Math Answers Grade 2 Chapter 2 Fluency and Strategies within 20 82\" width=\"568\" height=\"561\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-82.png 568w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-82-300x296.png 300w\" sizes=\"(max-width: 568px) 100vw, 568px\" \/><br \/>\nAnswer :<\/p>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-50895\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.4-Make-a-10-to-Add-Explore-Grow.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.4-Make-a-10-to-Add-Explore-Grow\" width=\"771\" height=\"552\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.4-Make-a-10-to-Add-Explore-Grow.jpg 771w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.4-Make-a-10-to-Add-Explore-Grow-300x215.jpg 300w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.4-Make-a-10-to-Add-Explore-Grow-768x550.jpg 768w\" sizes=\"(max-width: 771px) 100vw, 771px\" \/><br \/>\nExplanation :<br \/>\nWe have 7counters in first table and 6 counters in second table. To make ten counters in first table we should move 3 counters from second table to first table. then,we will have ten counters in first table and 3 in second table. add both 10 + 3 = 13<br \/>\nSo, 7 + 6 = 13 .<br \/>\n<strong>Show and Grow<\/strong><\/p>\n<p>Make a 10 to add.<\/p>\n<p>Question 1.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18803\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-83.png\" alt=\"Big Ideas Math Answers Grade 2 Chapter 2 Fluency and Strategies within 20 83\" width=\"261\" height=\"220\" \/><br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-49742\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.4-Make-10-to-Show-Grow-Add-Question-1.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.4-Make-10-to-Show-Grow-Add-Question-1\" width=\"261\" height=\"220\" \/><br \/>\nExplanation :<br \/>\nTo make addend 9 as 10 we should add 1 to the 9 then write addend 7\u00a0 as\u00a0 6 + 1 .<br \/>\nthen add 9 + 1 we get , 10 and then later add 6 to 10 we get sum , 16 .<\/p>\n<p>Question 2.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18705\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-84.png\" alt=\"Big Ideas Math Answers 2nd Grade Chapter 2 Fluency and Strategies within 20 84\" width=\"254\" height=\"227\" \/><br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-49743\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.4-Make-10-to-Show-Grow-Add-Question-2.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.4-Make-10-to-Show-Grow-Add-Question-2\" width=\"254\" height=\"227\" \/><br \/>\nExplanation :<br \/>\nTo make addend 9 as 10 we should add 1 to the 9 then write addend 5 as\u00a0 4 + 1 .<br \/>\nthen add 9 + 1 we get , 10 and then later add 4 to 10 we get sum , 14 .<\/p>\n<p>Question 3.<br \/>\n6 + 8 = ?<br \/>\n10 + __ = ___<br \/>\nSo, 6 + 8 = ___<br \/>\nAnswer :<br \/>\n6 + 8 =<br \/>\n4 + 2 + 8 =<br \/>\n10 + 4 = 14<br \/>\nSo, 6 + 8 = 14<br \/>\nExplanation :<br \/>\nTo make addend 8 as 10 we should add 2 to the 8 then write addend 6\u00a0 as\u00a0 4 + 2 .<br \/>\nthen add 8 + 2 we get , 10 and then later add 4 to 10 we get sum , 14 .<\/p>\n<p>Question 4.<br \/>\n7 + 4 = ?<br \/>\n10 + __ = ___<br \/>\nSo, 7 + 4 = ___<br \/>\nAnswer :<br \/>\n7 + 4 =<br \/>\n7 + 3 + 1 =<br \/>\n10 + 1 = 11<br \/>\nSo, 7 + 4 = 11<br \/>\nExplanation :<br \/>\nTo make addend 7 as 10 we should add 3 to the 7 then write addend 4 as\u00a0 3 + 1 .<br \/>\nthen add 7 + 3 we get , 10 and then later add 1 to 10 we get sum , 11 .<\/p>\n<p><strong>Apply and Grow: Practice<\/strong><\/p>\n<p>Make a 10 to add.<\/p>\n<p>Question 5.<br \/>\n2 + 9 = ?<br \/>\n10 + __ = ___<br \/>\nSo, 2 + 9 = ___<br \/>\nAnswer :<br \/>\n2 + 9 =<br \/>\n1 + 1 + 9 =<br \/>\n1 + 10 = 11<br \/>\nSo, 2 + 9 = 11<br \/>\nExplanation :<br \/>\nTo make addend 9 as 10 we should add 1 to the 9 then write addend 2 as\u00a0 1 + 1 .<br \/>\nthen add 9 + 1 we get , 10 and then later add 1 to 10 we get sum , 11 .<\/p>\n<p>Question 6.<br \/>\n8 + 4 = ?<br \/>\n10 + ___ = __<br \/>\nSo, 8 + 4 = ___<br \/>\nAnswer :<br \/>\n8 + 4 =<br \/>\n2 + 2 + 8 =<br \/>\n2 + 10 = 12<br \/>\nSo, 8 + 4 = 12<br \/>\nExplanation :<br \/>\nTo make addend 8 as 10 we should add 2 to the 8 then write addend 4\u00a0 as\u00a0 2 + 2 .<br \/>\nthen add 2 + 8 we get , 10 and then later add 2 to 10 we get sum , 12 .<\/p>\n<p>Question 7.<br \/>\n9 +6 = ?<br \/>\n10+ ___ = ___<br \/>\nSo, 9 + 6 = ___<br \/>\nAnswer :<br \/>\n9 + 6 =<br \/>\n9 + 1 + 5 =<br \/>\n10 + 5 = 15<br \/>\nSo, 9 + 6 = 15<br \/>\nExplanation :<br \/>\nTo make addend 9 as 10 we should add 1 to the 9 then write addend 6\u00a0 as\u00a0 5 + 1 .<br \/>\nthen add 9 + 1 we get , 10 and then later add 5 to 10 we get sum , 15 .<\/p>\n<p>Question 8.<br \/>\n7 + 7 = ?<br \/>\n10 + __ = ___<br \/>\nSo, 7 + 7 = ___<br \/>\nAnswer :<br \/>\n7 + 7 =<br \/>\n7 + 3 + 4 =<br \/>\n10 + 4 = 14<br \/>\nSo, 7 + 7 = 14<br \/>\nExplanation :<br \/>\nTo make addend 7 as 10 we should add 3 to the 7 then write addend 7 as\u00a0 3 + 4 .<br \/>\nthen add 7 + 3 we get , 10 and then later add 4 to 10 we get sum , 14 .<\/p>\n<p>Question 9.<br \/>\n6 + 5 = ___<br \/>\nAnswer :<br \/>\n6 + 5 =<br \/>\n6 + 4 + 1 =<br \/>\n10 + 1 = 11<br \/>\nSo, 6 + 5 = 11<br \/>\nExplanation :<br \/>\nTo make addend 6 as 10 we should add 4 to the 6 then write addend 5\u00a0 as\u00a0 4 + 1 .<br \/>\nthen add 6 + 4 we get , 10 and then later add 1 to 10 we get sum , 11 .<\/p>\n<p>Question 10.<br \/>\n8 + 9 = ___<br \/>\nAnswer :<br \/>\n8 + 9 =<br \/>\n7 + 1 + 9 =<br \/>\n7 + 10 = 17<br \/>\nSo, 8 + 9 = 17<br \/>\nExplanation :<br \/>\nTo make addend 9 as 10 we should add 1 to the 9 then write addend 8\u00a0 as\u00a0 7 + 1 .<br \/>\nthen add 9 + 1 we get , 10 and then later add 7 to 10 we get sum , 17 .<\/p>\n<p>Question 11.<br \/>\n7 + 5 = ___<br \/>\nAnswer :<br \/>\n7 + 5 =<br \/>\n7 + 3 + 2=<br \/>\n10 + 2 = 12<br \/>\nSo, 7 + 5 = 12<br \/>\nExplanation :<br \/>\nTo make addend 7 as 10 we should add 3 to the 7 then write addend 5 as\u00a0 3 + 2 .<br \/>\nthen add 7 + 3 we get , 10 and then later add 2 to 10 we get sum , 12 .<\/p>\n<p>Question 12.<br \/>\n6 + 6 = ___<br \/>\nAnswer :<br \/>\n6 + 6 =<br \/>\n6 + 4 + 2 =<br \/>\n10 + 2 = 12<br \/>\nSo, 6 + 6 = 12<br \/>\nExplanation :<br \/>\nTo make addend 6 as 10 we should add 4 to the 6 then write addend 6\u00a0 as\u00a0 4 + 2 .<br \/>\nthen add 6 + 4 we get , 10 and then later add 2 to 10 we get sum , 12 .<\/p>\n<p>Question 13.<br \/>\n9 + 9 = ___<br \/>\nAnswer :<br \/>\n9 + 9 =<br \/>\n9 + 1 + 8 =<br \/>\n10 + 8 = 18<br \/>\nSo, 9 + 9 = 18<br \/>\nExplanation :<br \/>\nTo make addend 9 as 10 we should add 1 to the 9 then write addend 9 as\u00a0 1 + 8 .<br \/>\nthen add 9 + 1 we get , 10 and then later add 8 to 10 we get sum , 18 .<\/p>\n<p>Question 14.<br \/>\n8 + 7 = __<br \/>\nAnswer :<br \/>\n8 + 7 =<br \/>\n5 + 2 + 8 =<br \/>\n10 + 5 = 15<br \/>\nSo, 8 + 7 = 15<br \/>\nExplanation :<br \/>\nTo make addend 8 as 10 we should add 2 to the 8 then write addend 7\u00a0 as\u00a0 5 + 2 .<br \/>\nthen add 8 + 2 we get , 10 and then later add 5 to 10 we get sum , 15 .<\/p>\n<p>Question 15.<br \/>\n__ = 4 + 7<br \/>\nAnswer :<br \/>\n4 + 7 =<br \/>\n1 + 3 + 7 =<br \/>\n1 + 10 = 11<br \/>\nSo, 4 + 7 = 11<br \/>\nExplanation :<br \/>\nTo make addend 7 as 10 we should add 3 to the 7 then write addend 4\u00a0 as\u00a0 1 + 3 .<br \/>\nthen add 3 + 7 we get , 10 and then later add 1 to 10 we get sum , 11 .<\/p>\n<p>Question 16.<br \/>\n__ = 9 + 4<br \/>\nAnswer :<br \/>\n9 + 4 =<br \/>\n9 + 1 + 3 =<br \/>\n10 + 3 = 13<br \/>\nSo, 9 + 4 = 13<br \/>\nExplanation :<br \/>\nTo make addend 9 as 10 we should add 1 to the 9 then write addend 4\u00a0 as\u00a0 1 + 3 .<br \/>\nthen add 9 + 1 we get , 10 and then later add 3 to 10 we get sum , 13 .<\/p>\n<p>Question 17.<br \/>\n__ = 8 + 8<br \/>\nAnswer :<br \/>\n8 + 8 =<br \/>\n6 + 2 + 8 =<br \/>\n6 + 10 = 16<br \/>\nSo, 8 + 8 = 16<br \/>\nExplanation :<br \/>\nTo make addend 8 as 10 we should add 2 to the 8 then write addend 8 as\u00a0 6 + 2 .<br \/>\nthen add 2 + 8 we get , 10 and then later add 6 to 10 we get sum , 16 .<\/p>\n<p>Question 18.<br \/>\n__ = 6 + 8<br \/>\nAnswer :<br \/>\n6 + 8 =<br \/>\n4 + 2 + 8 =<br \/>\n4 + 10 = 14<br \/>\nSo, 6 + 8 = 14<br \/>\nExplanation :<br \/>\nTo make addend 8 as 10 we should add 2 to the 8 then write addend 6\u00a0 as\u00a0 4 + 2 .<br \/>\nthen add 2 + 8 we get , 10 and then later add 4 to 10 we get sum , 14 .<\/p>\n<p>Question 19.<br \/>\n<strong>Number Sense<\/strong><br \/>\nHow can you make a 10 to \ufb01nd 7 + 6?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18706\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-85.png\" alt=\"Big Ideas Math Answers 2nd Grade Chapter 2 Fluency and Strategies within 20 85\" width=\"451\" height=\"52\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-85.png 451w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-85-300x35.png 300w\" sizes=\"(max-width: 451px) 100vw, 451px\" \/><br \/>\nAnswer :<br \/>\n7 + 6 =<br \/>\n7 + 3 + 3 =<br \/>\n10 + 3 = 13<br \/>\nSo, 7 + 6 = 13<\/p>\n<p>7 + 6 =<br \/>\n3 + 4 + 6 =<br \/>\n3 + 10 = 13<br \/>\nSo, 7 + 6 = 13<br \/>\nExplanation :<br \/>\nTo make addend 7 as 10 we should add 3 to the 7 then write addend 6\u00a0 as\u00a0 3 + 3 .<br \/>\nthen add 3 + 7 we get , 10 and then later add 3 to 10 we get sum , 13 .<br \/>\nTo make addend 6 as 10 we should add 4 to the 6 then write addend 7\u00a0 as\u00a0 3 + 4 .<br \/>\nthen add 4 + 6 we get , 10 and then later add 3 to 10 we get sum , 13 .<\/p>\n<p><strong>Think and Grow: Modeling Real Life<\/strong><\/p>\n<p>There are 13 boys and 4 girls in a line. How many girls must join the line so that the numbers of boys and girls are equal?<br \/>\nAddition equation:<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18707\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-86.png\" alt=\"Big Ideas Math Answers 2nd Grade Chapter 2 Fluency and Strategies within 20 86\" width=\"247\" height=\"211\" \/><br \/>\nAnswer :<br \/>\nNumber of boys = 13<br \/>\nNumber of girls = 4<br \/>\nNumber of girls required to add more to become 13 = 4 + _____ = 13 = 13 &#8211; 4 = 9<br \/>\nTherefore, Number of girls must join the line so that the numbers of boys and girls are equal = 9 girls .<\/p>\n<p><strong>Show and Grow<\/strong><\/p>\n<p>Question 20.<br \/>\nThere are 16 seals and 7 whales. How many whales must join them so that the numbers of seals and whales are equal?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18708\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-87.png\" alt=\"Big Ideas Math Answers 2nd Grade Chapter 2 Fluency and Strategies within 20 87\" width=\"152\" height=\"176\" \/><br \/>\nAnswer :<br \/>\nNumber of Seals = 16<br \/>\nNumber of Whales = 7<br \/>\nNumber of whales must join them so that the numbers of seals and whales are equal = 7 + ____ = 16 = 16 &#8211; 7 = 9<br \/>\nTherefore, Number of whales must join them so that the numbers of seals and whales are equal = 9<\/p>\n<p>Question 21.<br \/>\nYou and your friend count 15 stars in all. You count 8. How many stars does your friend count?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18709\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-88.png\" alt=\"Big Ideas Math Answers 2nd Grade Chapter 2 Fluency and Strategies within 20 88\" width=\"142\" height=\"140\" \/><br \/>\nAnswer :<br \/>\nNumber of stars Counted by me and my friend = 15<br \/>\nNumber of stars counted by me = 8<br \/>\nNumber of stars Counted by my friend = 15 &#8211; 8 = 7<\/p>\n<p>Question 22.<br \/>\nThere are 17 \ufb01sh in a tank. 9 are green. The rest are blue. How many \ufb01sh are blue?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18710\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-89.png\" alt=\"Big Ideas Math Answers 2nd Grade Chapter 2 Fluency and Strategies within 20 89\" width=\"126\" height=\"153\" \/><br \/>\nAnswer :<br \/>\nNumber of Fishes = 17<br \/>\nNumber of green Fishes = 9<br \/>\nNumber of blue Fishes = 17 &#8211; 9 = 8<\/p>\n<h3><a id=\"Make_a_10_to_Add_Homework_&amp;_Practice_2.4\"><\/a>Make a 10 to Add Homework &amp; Practice 2.4<\/h3>\n<p>Make a ten to add.<\/p>\n<p>Question 1.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18711\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-90.png\" alt=\"Big Ideas Math Answers 2nd Grade Chapter 2 Fluency and Strategies within 20 90\" width=\"279\" height=\"243\" \/><br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-49744\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Make-10-Add-Homework-Practice-2.4-Question-1.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Make-10-Add-Homework-Practice-2.4-Question-1\" width=\"279\" height=\"243\" \/><\/p>\n<p>Question 2.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18712\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-91.png\" alt=\"Big Ideas Math Answers 2nd Grade Chapter 2 Fluency and Strategies within 20 91\" width=\"280\" height=\"245\" \/><br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-49745\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Make-10-Add-Homework-Practice-2.4-Question-2.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Make-10-Add-Homework-Practice-2.4-Question-2\" width=\"280\" height=\"245\" \/><\/p>\n<p>Question 3.<br \/>\n7 + 6 = ?<br \/>\n10 + __ = ___<br \/>\nSo, 7 + 6 = ___<br \/>\nAnswer :<br \/>\n7 + 6 =<br \/>\n7 + 3 + 3 =<br \/>\n3 + 10 = 13<br \/>\nSo, 7 + 6 = 13<br \/>\nExplanation :<br \/>\nTo make addend 7 as 10 we should add 3 to the 7 then write addend 6 as\u00a0 3 + 3 .<br \/>\nthen add 3 + 7 we get , 10 and then later add 3 to 10 we get sum , 13 .<\/p>\n<p>Question 4.<br \/>\n8 + 3 = ___<br \/>\n10 + __ = ___<br \/>\nSo, 8 + 3 = __<br \/>\nAnswer :<br \/>\n8 + 3=<br \/>\n8 + 2 + 1 =<br \/>\n1 + 10 = 11<br \/>\nSo, 8 + 3 = 11<br \/>\nExplanation :<br \/>\nTo make addend 8 as 10 we should add 2 to the 8 then write addend 3\u00a0 as\u00a0 2 + 1 .<br \/>\nthen add 2 + 8 we get , 10 and then later add 1 to 10 we get sum , 11 .<\/p>\n<p>Make a 10 to add.<\/p>\n<p>Question 5.<br \/>\n3 + 9 = ___<br \/>\nAnswer :<br \/>\n3 + 9 =<br \/>\n2 + 1 + 9 =<br \/>\n2 + 10 = 12<br \/>\nSo, 3 + 9 = 12<br \/>\nExplanation :<br \/>\nTo make addend 9 as 10 we should add 1 to the 9 so write addend\u00a0 3 as\u00a0 2 + 1 .<br \/>\nthen add 1 + 9 we get , 10 and then later add 2 to 10 we get sum , 12 .<\/p>\n<p>Question 6.<br \/>\n8 + 8 = ___<br \/>\nAnswer :<br \/>\n8 + 8 =<br \/>\n8 + 2 + 6 =<br \/>\n10 + 6 = 16<br \/>\nSo, 8 + 8 = 16<br \/>\nExplanation :<br \/>\nTo make addend 8 as 10 we should add 2 to the 8 so write addend\u00a0 8 as\u00a0 2 + 6 .<br \/>\nthen add 8 + 2 we get , 10 and then later add 6 to 10 we get sum , 16 .<\/p>\n<p>Question 7.<br \/>\n7 +4 = ___<br \/>\nAnswer :<br \/>\n7 + 4 =<br \/>\n7 + 3 + 1 =<br \/>\n10 + 1 = 11<br \/>\nSo, 7 + 4 = 11<br \/>\nExplanation :<br \/>\nTo make addend 7 as 10 we should add 3 to the 7 so write addend\u00a0 4 as\u00a0 3 + 1 .<br \/>\nthen add 7 + 3 we get , 10 and then later add 1 to 10 we get sum , 11 .<\/p>\n<p>Question 8.<br \/>\n4 + 9 = ___<br \/>\nAnswer :<br \/>\n4 + 9 =<br \/>\n3 + 1 + 9 =<br \/>\n10 + 3 = 13<br \/>\nSo, 4 + 9 = 13<br \/>\nExplanation :<br \/>\nTo make addend 9 as 10 we should add 1 to the 9 so write addend 4 as\u00a0 3 + 1 .<br \/>\nthen add 1 + 9 we get , 10 and then later add 3 to 10 we get sum , 13 .<\/p>\n<p>Question 9.<br \/>\n___ = 6 + 9<br \/>\nAnswer :<br \/>\n6 + 9 =<br \/>\n5 + 1 + 9 =<br \/>\n10 + 5 = 15<br \/>\nSo, 10 + 5 = 15<br \/>\nExplanation :<br \/>\nTo make addend 9 as 10 we should add 1 to the 9 so write addend\u00a0 6 as\u00a0 5 + 1 .<br \/>\nthen add 1 + 9 we get , 10 and then later add 5 to 10 we get sum , 15 .<\/p>\n<p>Question 10.<br \/>\n___ = 4 + 8<br \/>\nAnswer :<br \/>\n4 + 8 =<br \/>\n2 + 2 + 8 =<br \/>\n10 + 2 = 12<br \/>\nSo, 4 + 8 = 12<br \/>\nExplanation :<br \/>\nTo make addend 8 as 10 we should add 2 to the 8 so write addend\u00a0 4 as\u00a0 2 + 2 .<br \/>\nthen add 8 + 2 we get , 10 and then later add 2 to 10 we get sum , 12 .<\/p>\n<p>Question 11.<br \/>\n__ = 7 + 8<br \/>\nAnswer :<br \/>\n7 + 8 =<br \/>\n5 + 2 + 8 =<br \/>\n10 + 5 = 15<br \/>\nSo, 7 + 8 = 15<br \/>\nExplanation :<br \/>\nTo make addend 8 as 10 we should add 2 to the 8 so write addend\u00a0 7 as\u00a0 5 + 2 .<br \/>\nthen add 8 + 2 we get , 10 and then later add 5 to 10 we get sum , 15 .<\/p>\n<p>Question 12.<br \/>\n___ = 9 + 2<br \/>\n9 + 2 =<br \/>\n9 + 1 + 1 =<br \/>\n10 + 1 = 11<br \/>\nSo, 9 + 2 = 11<br \/>\nExplanation :<br \/>\nTo make addend 9 as 10 we should add 1 to the 9 so write addend 2 as\u00a0 1 + 1 .<br \/>\nthen add 9 + 1 we get , 10 and then later add 1 to 10 we get sum , 11 .<\/p>\n<p>Question 13.<br \/>\n<strong>Number Sense<\/strong><br \/>\nComplete each equation.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18713\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-92.png\" alt=\"Big Ideas Math Answers 2nd Grade Chapter 2 Fluency and Strategies within 20 92\" width=\"652\" height=\"38\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-92.png 652w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-92-300x17.png 300w\" sizes=\"(max-width: 652px) 100vw, 652px\" \/><\/p>\n<p>Answer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-49747\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Make-10-Add-Homework-Practice-2.4-Question-13.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Make-10-Add-Homework-Practice-2.4-Question-13\" width=\"629\" height=\"79\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Make-10-Add-Homework-Practice-2.4-Question-13.jpg 629w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Make-10-Add-Homework-Practice-2.4-Question-13-300x38.jpg 300w\" sizes=\"(max-width: 629px) 100vw, 629px\" \/><\/p>\n<p>Question 14.<br \/>\n<strong>Modeling Real Life<\/strong><br \/>\nThere are 12 giraffes and 5 elephants. How many elephants must join them so that the numbers of giraffes and elephants are equal?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18714\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-93.png\" alt=\"Big Ideas Math Answers 2nd Grade Chapter 2 Fluency and Strategies within 20 93\" width=\"598\" height=\"175\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-93.png 598w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-93-300x88.png 300w\" sizes=\"(max-width: 598px) 100vw, 598px\" \/><br \/>\nAnswer :<br \/>\nNumber of Giraffes = 12<br \/>\nNumber of Elephants = 5<br \/>\nNumber of more elephants must join them so that the numbers of giraffes and elephants are equal = 12 &#8211; 5 = 7<br \/>\nTherefore 7 more elephants must join them so that the numbers of giraffes and elephants will be equal .<\/p>\n<p>Question 15.<br \/>\n<strong>Modeling Real Life<\/strong><br \/>\nThere are 14 horses on a farm. 7 are brown. The rest are white. How many are white?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18715\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-94.png\" alt=\"Big Ideas Math Answers 2nd Grade Chapter 2 Fluency and Strategies within 20 94\" width=\"612\" height=\"170\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-94.png 612w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-94-300x83.png 300w\" sizes=\"(max-width: 612px) 100vw, 612px\" \/><br \/>\nAnswer :<br \/>\nNumber of Horses = 14<br \/>\nNumber of Brown Horses = 7<br \/>\nNumber of White Horses = 14 &#8211; 7 = 7<\/p>\n<p><strong>Review &amp; Refresh<\/strong><\/p>\n<p>Compare.<\/p>\n<p>Question 16.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18716\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-95.png\" alt=\"Big Ideas Math Answers 2nd Grade Chapter 2 Fluency and Strategies within 20 95\" width=\"120\" height=\"51\" \/><br \/>\nAnswer :<br \/>\n21 &lt; 22<br \/>\nExplanation :<br \/>\n21 is lesser than 22<\/p>\n<p>Question 17.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18717\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-96.png\" alt=\"Big Ideas Math Answers 2nd Grade Chapter 2 Fluency and Strategies within 20 96\" width=\"124\" height=\"50\" \/><br \/>\nAnswer :<br \/>\n43 &gt; 34<br \/>\nExplanation :<br \/>\n43 is greater than 34<\/p>\n<h3><a id=\"Lesson_2.5_Count_On_and_Count_Back_to_Subtract\"><\/a>Lesson 2.5 Count On and Count Back to Subtract<\/h3>\n<p><strong>Explore and Grow<\/strong><\/p>\n<p>Show two ways to \ufb01nd the difference on the number lines.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18718\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-97.png\" alt=\"Big Ideas Math Answers 2nd Grade Chapter 2 Fluency and Strategies within 20 97\" width=\"533\" height=\"423\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-97.png 533w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-97-300x238.png 300w\" sizes=\"(max-width: 533px) 100vw, 533px\" \/><br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50869\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Explore-Grow-1.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson 2.5-Count-On-and-Count-Back-to-Subtract-Explore-Grow\" width=\"747\" height=\"545\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Explore-Grow-1.jpg 747w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Explore-Grow-1-300x219.jpg 300w\" sizes=\"(max-width: 747px) 100vw, 747px\" \/><br \/>\nExplanation :<br \/>\nCount back to find the difference &#8211; start at 13 and count back 9.the arrow ending at 4 shows the difference.<br \/>\nCount on to find the difference &#8211; Start at 9 and count on to 13.<\/p>\n<p><strong>Show and Grow<\/strong><\/p>\n<p>Question 1.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18719\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-98.png\" alt=\"Big Ideas Math Answers 2nd Grade Chapter 2 Fluency and Strategies within 20 98\" width=\"604\" height=\"61\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-98.png 604w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-98-300x30.png 300w\" sizes=\"(max-width: 604px) 100vw, 604px\" \/><br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50844\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Show-Grow-Question-1.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson 2.5-Count-On-and-Count-Back-to-Subtract-Show-Grow-Question-1\" width=\"832\" height=\"156\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Show-Grow-Question-1.jpg 832w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Show-Grow-Question-1-300x56.jpg 300w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Show-Grow-Question-1-768x144.jpg 768w\" sizes=\"(max-width: 832px) 100vw, 832px\" \/><br \/>\nExplanation :<br \/>\nCount back to find the difference &#8211; start at 11 and count back 5.the arrow ending at 6 shows the difference.<\/p>\n<p>Question 2.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18720\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-99.png\" alt=\"Big Ideas Math Answers 2nd Grade Chapter 2 Fluency and Strategies within 20 99\" width=\"601\" height=\"65\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-99.png 601w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-99-300x32.png 300w\" sizes=\"(max-width: 601px) 100vw, 601px\" \/><br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50846\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Show-Grow-Question-2.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson 2.5-Count-On-and-Count-Back-to-Subtract-Show-Grow-Question-2\" width=\"807\" height=\"147\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Show-Grow-Question-2.jpg 807w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Show-Grow-Question-2-300x55.jpg 300w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Show-Grow-Question-2-768x140.jpg 768w\" sizes=\"(max-width: 807px) 100vw, 807px\" \/><br \/>\nExplanation :<br \/>\nCount back to find the difference &#8211; start at 15 and count back 8.the arrow ending at 7 shows the difference.<\/p>\n<p>Question 3.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18721\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-100.png\" alt=\"Big Ideas Math Answers 2nd Grade Chapter 2 Fluency and Strategies within 20 100\" width=\"602\" height=\"65\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-100.png 602w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-100-300x32.png 300w\" sizes=\"(max-width: 602px) 100vw, 602px\" \/><br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50847\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Show-Grow-Question-3.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson 2.5-Count-On-and-Count-Back-to-Subtract-Show-Grow-Question-3\" width=\"810\" height=\"147\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Show-Grow-Question-3.jpg 810w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Show-Grow-Question-3-300x54.jpg 300w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Show-Grow-Question-3-768x139.jpg 768w\" sizes=\"(max-width: 810px) 100vw, 810px\" \/><br \/>\nExplanation :<br \/>\nCount back to find the difference &#8211; start at 9 and count back 6.the arrow ending at 3 shows the difference.<\/p>\n<p>Question 4.<br \/>\n16 &#8211; 8 = ___<br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50848\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Show-Grow-Question-4.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson 2.5-Count-On-and-Count-Back-to-Subtract-Show-Grow-Question-4\" width=\"834\" height=\"145\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Show-Grow-Question-4.jpg 834w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Show-Grow-Question-4-300x52.jpg 300w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Show-Grow-Question-4-768x134.jpg 768w\" sizes=\"(max-width: 834px) 100vw, 834px\" \/><br \/>\nExplanation :<br \/>\nCount back to find the difference &#8211; start at 16 and count back 8.the arrow ending at 8 shows the difference.<\/p>\n<p><strong>Apply and Grow: Practice<\/strong><\/p>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-18722\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-101.png\" alt=\"Big Ideas Math Answers 2nd Grade Chapter 2 Fluency and Strategies within 20 101\" width=\"526\" height=\"69\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-101.png 526w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-101-300x39.png 300w\" sizes=\"(max-width: 526px) 100vw, 526px\" \/><\/p>\n<p>Question 5.<br \/>\n11 &#8211; 8 = ___<br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50849\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-5.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson 2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-5\" width=\"820\" height=\"152\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-5.jpg 820w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-5-300x56.jpg 300w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-5-768x142.jpg 768w\" sizes=\"(max-width: 820px) 100vw, 820px\" \/><br \/>\nExplanation :<br \/>\nCount back to find the difference &#8211; start at 11 and count back 8.the arrow ending at 3 shows the difference.<\/p>\n<p>Question 6.<br \/>\n10 &#8211; 6 = ___<br \/>\nAnswer :<\/p>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-50850\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-6.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson 2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-6\" width=\"802\" height=\"126\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-6.jpg 802w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-6-300x47.jpg 300w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-6-768x121.jpg 768w\" sizes=\"(max-width: 802px) 100vw, 802px\" \/><\/p>\n<p>Explanation :<br \/>\nCount back to find the difference &#8211; start at 10 and count back 6. The arrow ending at 4 shows the difference.<\/p>\n<p>Question 7.<br \/>\n14 &#8211; 6 = ___<br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50852\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-7.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson 2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-7\" width=\"813\" height=\"135\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-7.jpg 813w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-7-300x50.jpg 300w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-7-768x128.jpg 768w\" sizes=\"(max-width: 813px) 100vw, 813px\" \/><br \/>\nExplanation :<br \/>\nCount back to find the difference &#8211; start at 14 and count back 6. The arrow ending at 8 shows the difference.<\/p>\n<p>Question 8.<br \/>\n11 &#8211; 4 = ___<br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50853\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-8.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson 2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-8\" width=\"800\" height=\"153\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-8.jpg 800w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-8-300x57.jpg 300w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-8-768x147.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><br \/>\nExplanation :<br \/>\nCount back to find the difference &#8211; start at 11 and count back 4. The arrow ending at 7 shows the difference.<\/p>\n<p>Question 9.<br \/>\n15 &#8211; 9 = ___<br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50854\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-9.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson 2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-9\" width=\"824\" height=\"149\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-9.jpg 824w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-9-300x54.jpg 300w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-9-768x139.jpg 768w\" sizes=\"(max-width: 824px) 100vw, 824px\" \/><br \/>\nExplanation :<br \/>\nCount back to find the difference &#8211; start at 15 and count back 9. The arrow ending at 6 shows the difference.<\/p>\n<p>Question 10.<br \/>\n16 &#8211; 7 = ___<br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50855\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-10.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson 2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-10\" width=\"793\" height=\"135\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-10.jpg 793w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-10-300x51.jpg 300w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-10-768x131.jpg 768w\" sizes=\"(max-width: 793px) 100vw, 793px\" \/><br \/>\nExplanation :<br \/>\nCount back to find the difference &#8211; start at 16 and count back 7. The arrow ending at 9 shows the difference.<\/p>\n<p>Question 11.<br \/>\n14 &#8211; 9 = ___<br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50857\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-11.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson 2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-11\" width=\"823\" height=\"156\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-11.jpg 823w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-11-300x57.jpg 300w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-11-768x146.jpg 768w\" sizes=\"(max-width: 823px) 100vw, 823px\" \/><br \/>\nExplanation :<br \/>\nCount back to find the difference &#8211; start at 14 and count back 9. The arrow ending at 5 shows the difference.<\/p>\n<p>Question 12.<br \/>\n12 &#8211; 4 = ___<br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50858\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-12.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson 2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-12\" width=\"798\" height=\"129\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-12.jpg 798w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-12-300x48.jpg 300w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-12-768x124.jpg 768w\" sizes=\"(max-width: 798px) 100vw, 798px\" \/><br \/>\nExplanation :<br \/>\nCount back to find the difference &#8211; start at 12 and count back 4. The arrow ending at 8 shows the difference.<\/p>\n<p>Question 13.<br \/>\n10 &#8211; 7 = ___<br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50859\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-13.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson 2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-13\" width=\"820\" height=\"166\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-13.jpg 820w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-13-300x61.jpg 300w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-13-768x155.jpg 768w\" sizes=\"(max-width: 820px) 100vw, 820px\" \/><br \/>\nExplanation :<br \/>\nCount back to find the difference &#8211; start at 10 and count back 7. The arrow ending at 3 shows the difference.<\/p>\n<p>Question 14.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18723\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-102.png\" alt=\"Big Ideas Math Answers 2nd Grade Chapter 2 Fluency and Strategies within 20 102\" width=\"95\" height=\"126\" \/><br \/>\nAnswer :<br \/>\n8 &#8211; 4 = 4<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50860\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-14.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson 2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-14\" width=\"796\" height=\"125\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-14.jpg 796w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-14-300x47.jpg 300w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-14-768x121.jpg 768w\" sizes=\"(max-width: 796px) 100vw, 796px\" \/><br \/>\nExplanation :<br \/>\nCount back to find the difference &#8211; start at 8 and count back 4. The arrow ending at 4 shows the difference.<\/p>\n<p>Question 15.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18724\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-103.png\" alt=\"Big Ideas Math Answers 2nd Grade Chapter 2 Fluency and Strategies within 20 103\" width=\"94\" height=\"124\" \/><br \/>\nAnswer :<br \/>\n11 &#8211; 6 = 5<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50863\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-15.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson 2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-15\" width=\"793\" height=\"115\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-15.jpg 793w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-15-300x44.jpg 300w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-15-768x111.jpg 768w\" sizes=\"(max-width: 793px) 100vw, 793px\" \/><br \/>\nExplanation :<br \/>\nCount back to find the difference &#8211; start at 11 and count back 6. The arrow ending at 5 shows the difference.<\/p>\n<p>Question 16.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18725\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-104.png\" alt=\"Big Ideas Math Answers 2nd Grade Chapter 2 Fluency and Strategies within 20 104\" width=\"94\" height=\"125\" \/><br \/>\nAnswer :<br \/>\n18 &#8211; 9 = 9<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50864\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-16.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson 2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-16\" width=\"791\" height=\"130\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-16.jpg 791w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-16-300x49.jpg 300w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-16-768x126.jpg 768w\" sizes=\"(max-width: 791px) 100vw, 791px\" \/><br \/>\nExplanation :<br \/>\nCount back to find the difference &#8211; start at 18 and count back 9. The arrow ending at 9 shows the difference.<\/p>\n<p>Question 17.<br \/>\n__ = 9 &#8211; 2<br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50867\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-17.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson 2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-17\" width=\"795\" height=\"118\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-17.jpg 795w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-17-300x45.jpg 300w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-17-768x114.jpg 768w\" sizes=\"(max-width: 795px) 100vw, 795px\" \/><br \/>\nExplanation :<br \/>\nCount back to find the difference &#8211; start at 9 and count back 2. The arrow ending at 7 shows the difference.<\/p>\n<p>Question 18.<br \/>\n___ = 13 &#8211; 5<br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50866\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-18.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson 2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-18\" width=\"795\" height=\"123\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-18.jpg 795w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-18-300x46.jpg 300w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-18-768x119.jpg 768w\" sizes=\"(max-width: 795px) 100vw, 795px\" \/><br \/>\nExplanation :<br \/>\nCount back to find the difference &#8211; start at 13 and count back 5. The arrow ending at 8 shows the difference.<\/p>\n<p>Question 19.<br \/>\n__ = 14 &#8211; 7<br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50865\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-19.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson 2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-19\" width=\"805\" height=\"136\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-19.jpg 805w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-19-300x51.jpg 300w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Apply-and-Grow-Practice-Question-19-768x130.jpg 768w\" sizes=\"(max-width: 805px) 100vw, 805px\" \/><br \/>\nExplanation :<br \/>\nCount back to find the difference &#8211; start at 14 and count back 7. The arrow ending at 7 shows the difference.<\/p>\n<p>Question 20.<br \/>\n<strong>Structure<\/strong><br \/>\nWhat strategy did Newton use to solve? How do you know?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18726\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-105.png\" alt=\"Big Ideas Math Answers 2nd Grade Chapter 2 Fluency and Strategies within 20 105\" width=\"639\" height=\"224\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-105.png 639w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-105-300x105.png 300w\" sizes=\"(max-width: 639px) 100vw, 639px\" \/><br \/>\nAnswer :<br \/>\n13 &#8211; 8 = 5<br \/>\nThe Method Used here is Count On to find the difference<br \/>\nExplanation :<br \/>\nIt started at 8 and count on to 13 .<\/p>\n<p><strong>Think and Grow: Modeling Real Life<\/strong><\/p>\n<p>There are 13 backpacks in your classroom. 9 are taken. How many backpacks are left?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18727\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-106.png\" alt=\"Big Ideas Math Answers 2nd Grade Chapter 2 Fluency and Strategies within 20 106\" width=\"168\" height=\"143\" \/><br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18728\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-107.png\" alt=\"Big Ideas Math Answers 2nd Grade Chapter 2 Fluency and Strategies within 20 107\" width=\"560\" height=\"262\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-107.png 560w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-107-300x140.png 300w\" sizes=\"(max-width: 560px) 100vw, 560px\" \/><br \/>\nAnswer :<br \/>\nNumber of backpacks = 13<br \/>\nNumber of backpacks taken = 9<br \/>\nNumber of backpacks left = 13 &#8211; 9 = 4<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50868\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Think-and-Grow-Modeling-Real-Life.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson 2.5-Count-On-and-Count-Back-to-Subtract-Think-and-Grow-Modeling-Real-Life\" width=\"818\" height=\"368\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Think-and-Grow-Modeling-Real-Life.jpg 818w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Think-and-Grow-Modeling-Real-Life-300x135.jpg 300w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.5-Count-On-and-Count-Back-to-Subtract-Think-and-Grow-Modeling-Real-Life-768x346.jpg 768w\" sizes=\"(max-width: 818px) 100vw, 818px\" \/><br \/>\nExplanation :<br \/>\nCount back to find the difference &#8211; start at 10 and count back 6. The arrow ending at 4 shows the difference.<\/p>\n<p><strong>Show and Grow<\/strong><\/p>\n<p>Question 21.<br \/>\nThere are 17 trays in a stack. 7 are used. How many trays are left?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18729\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-108.png\" alt=\"Big Ideas Math Answers 2nd Grade Chapter 2 Fluency and Strategies within 20 108\" width=\"169\" height=\"140\" \/><br \/>\nAnswer :<br \/>\nNumber of trays = 17<br \/>\nNumber of used trays = 7<br \/>\nNumber of trays left\u00a0 =17 &#8211; 7 = 10<br \/>\nTherefore 10 trays are not used .<\/p>\n<p>Question 22.<br \/>\n<strong>DIG DEEPER!<\/strong><br \/>\nNewton wants to download some songs. 8 songs are downloaded. There are 6 songs left. How many songs did Newton want to download?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18730\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-109.png\" alt=\"Big Ideas Math Answers 2nd Grade Chapter 2 Fluency and Strategies within 20 109\" width=\"145\" height=\"189\" \/><br \/>\nAnswer :<br \/>\nNumber of songs downloaded = 8<br \/>\nNumber of songs left for downloading = 7<br \/>\nTotal Number of songs = 8 + 7 = 15 .<br \/>\nTherefore , newton want to download 15 songs .<\/p>\n<h3><a id=\"Count_On_and_Count_Back_to_Subtract_Homework_&amp;_Practice_2.5\"><\/a>Count On and Count Back to Subtract Homework &amp; Practice 2.5<\/h3>\n<p>Question 1.<br \/>\n7 &#8211; 5 = __<br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50870\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Count-On-and-Count-Back-to-Subtract-Homework-Practice-2.5-Question-1.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Count-On-and-Count-Back-to-Subtract-Homework-&amp;-Practice-2.5-Question-1\" width=\"833\" height=\"167\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Count-On-and-Count-Back-to-Subtract-Homework-Practice-2.5-Question-1.jpg 833w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Count-On-and-Count-Back-to-Subtract-Homework-Practice-2.5-Question-1-300x60.jpg 300w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Count-On-and-Count-Back-to-Subtract-Homework-Practice-2.5-Question-1-768x154.jpg 768w\" sizes=\"(max-width: 833px) 100vw, 833px\" \/>Explanation :<br \/>\nCount back to find the difference &#8211; start at 7 and count back 5. The arrow ending at 2 shows the difference.<\/p>\n<p>Question 2.<br \/>\n11 &#8211; 7 = __<br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50871\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Count-On-and-Count-Back-to-Subtract-Homework-Practice-2.5-Question-2.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Count-On-and-Count-Back-to-Subtract-Homework-&amp;-Practice-2.5-Question-2\" width=\"808\" height=\"151\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Count-On-and-Count-Back-to-Subtract-Homework-Practice-2.5-Question-2.jpg 808w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Count-On-and-Count-Back-to-Subtract-Homework-Practice-2.5-Question-2-300x56.jpg 300w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Count-On-and-Count-Back-to-Subtract-Homework-Practice-2.5-Question-2-768x144.jpg 768w\" sizes=\"(max-width: 808px) 100vw, 808px\" \/><br \/>\nExplanation :<br \/>\nCount back to find the difference &#8211; start at 11 and count back 7. The arrow ending at 4 shows the difference.<\/p>\n<p>Question 3.<br \/>\n12 &#8211; 5 = __<br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50872\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Count-On-and-Count-Back-to-Subtract-Homework-amp-Practice-2.5-Question-3.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Count-On-and-Count-Back-to-Subtract-Homework-&amp;-Practice-2.5-Question-3\" width=\"798\" height=\"129\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Count-On-and-Count-Back-to-Subtract-Homework-amp-Practice-2.5-Question-3.jpg 798w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Count-On-and-Count-Back-to-Subtract-Homework-amp-Practice-2.5-Question-3-300x48.jpg 300w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Count-On-and-Count-Back-to-Subtract-Homework-amp-Practice-2.5-Question-3-768x124.jpg 768w\" sizes=\"(max-width: 798px) 100vw, 798px\" \/><br \/>\nExplanation :<br \/>\nCount back to find the difference &#8211; start at 12 and count back 5. The arrow ending at 7 shows the difference.<\/p>\n<p>Question 4.<br \/>\n17 &#8211; 8 = ___<br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50873\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Count-On-and-Count-Back-to-Subtract-Homework-Practice-2.5-Question-4.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Count-On-and-Count-Back-to-Subtract-Homework-&amp;-Practice-2.5-Question-4\" width=\"802\" height=\"121\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Count-On-and-Count-Back-to-Subtract-Homework-Practice-2.5-Question-4.jpg 802w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Count-On-and-Count-Back-to-Subtract-Homework-Practice-2.5-Question-4-300x45.jpg 300w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Count-On-and-Count-Back-to-Subtract-Homework-Practice-2.5-Question-4-768x116.jpg 768w\" sizes=\"(max-width: 802px) 100vw, 802px\" \/><br \/>\nExplanation :<br \/>\nCount back to find the difference &#8211; start at 17 and count back 8. The arrow ending at 9 shows the difference.<\/p>\n<p>Question 5.<br \/>\n7 &#8211; 2 = ___<br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50877\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Count-On-and-Count-Back-to-Subtract-Homework-amp-Practice-2.5-Question-5.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Count-On-and-Count-Back-to-Subtract-Homework-&amp;-Practice-2.5-Question-5\" width=\"807\" height=\"128\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Count-On-and-Count-Back-to-Subtract-Homework-amp-Practice-2.5-Question-5.jpg 807w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Count-On-and-Count-Back-to-Subtract-Homework-amp-Practice-2.5-Question-5-300x48.jpg 300w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Count-On-and-Count-Back-to-Subtract-Homework-amp-Practice-2.5-Question-5-768x122.jpg 768w\" sizes=\"(max-width: 807px) 100vw, 807px\" \/><br \/>\nExplanation :<br \/>\nCount back to find the difference &#8211; start at 7 and count back 2. The arrow ending at 5 shows the difference.<\/p>\n<p>Question 6.<br \/>\n16 &#8211; 9 = ___<br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50875\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Count-On-and-Count-Back-to-Subtract-Homework-amp-Practice-2.5-Question-6-1.jpg\" alt=\"\" width=\"837\" height=\"147\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Count-On-and-Count-Back-to-Subtract-Homework-amp-Practice-2.5-Question-6-1.jpg 837w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Count-On-and-Count-Back-to-Subtract-Homework-amp-Practice-2.5-Question-6-1-300x53.jpg 300w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Count-On-and-Count-Back-to-Subtract-Homework-amp-Practice-2.5-Question-6-1-768x135.jpg 768w\" sizes=\"(max-width: 837px) 100vw, 837px\" \/><br \/>\nExplanation :<br \/>\nCount back to find the difference &#8211; start at 16 and count back 9. The arrow ending at 5 shows the difference.<\/p>\n<p>Question 7.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18731\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-110.png\" alt=\"Big Ideas Math Answers 2nd Grade Chapter 2 Fluency and Strategies within 20 110\" width=\"98\" height=\"123\" \/><br \/>\nAnswer :<br \/>\n9 &#8211; 3 = 3<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50880\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Count-On-and-Count-Back-to-Subtract-Homework-amp-Practice-2.5-Question-7.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Count-On-and-Count-Back-to-Subtract-Homework-&amp;-Practice-2.5-Question-7\" width=\"791\" height=\"125\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Count-On-and-Count-Back-to-Subtract-Homework-amp-Practice-2.5-Question-7.jpg 791w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Count-On-and-Count-Back-to-Subtract-Homework-amp-Practice-2.5-Question-7-300x47.jpg 300w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Count-On-and-Count-Back-to-Subtract-Homework-amp-Practice-2.5-Question-7-768x121.jpg 768w\" sizes=\"(max-width: 791px) 100vw, 791px\" \/><br \/>\nExplanation :<br \/>\nCount back to find the difference &#8211; start at 9 and count back 3. The arrow ending at 6 shows the difference.<\/p>\n<p>Question 8.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18732\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-111.png\" alt=\"Big Ideas Math Answers 2nd Grade Chapter 2 Fluency and Strategies within 20 111\" width=\"99\" height=\"123\" \/><br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50878\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Count-On-and-Count-Back-to-Subtract-Homework-amp-Practice-2.5-Question-8.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Count-On-and-Count-Back-to-Subtract-Homework-&amp;-Practice-2.5-Question-8\" width=\"809\" height=\"130\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Count-On-and-Count-Back-to-Subtract-Homework-amp-Practice-2.5-Question-8.jpg 809w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Count-On-and-Count-Back-to-Subtract-Homework-amp-Practice-2.5-Question-8-300x48.jpg 300w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Count-On-and-Count-Back-to-Subtract-Homework-amp-Practice-2.5-Question-8-768x123.jpg 768w\" sizes=\"(max-width: 809px) 100vw, 809px\" \/><br \/>\nExplanation :<br \/>\nCount back to find the difference &#8211; start at 13 and count back 4. The arrow ending at 9 shows the difference.<\/p>\n<p>Question 9.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18733\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-112.png\" alt=\"Big Ideas Math Answers 2nd Grade Chapter 2 Fluency and Strategies within 20 112\" width=\"95\" height=\"124\" \/><br \/>\nAnswer :<br \/>\n12 &#8211; 6 = 6<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50881\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Count-On-and-Count-Back-to-Subtract-Homework-Practice-2.5-Question-9.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Count-On-and-Count-Back-to-Subtract-Homework-&amp;-Practice-2.5-Question-9\" width=\"788\" height=\"107\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Count-On-and-Count-Back-to-Subtract-Homework-Practice-2.5-Question-9.jpg 788w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Count-On-and-Count-Back-to-Subtract-Homework-Practice-2.5-Question-9-300x41.jpg 300w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Count-On-and-Count-Back-to-Subtract-Homework-Practice-2.5-Question-9-768x104.jpg 768w\" sizes=\"(max-width: 788px) 100vw, 788px\" \/><br \/>\nExplanation :<br \/>\nCount back to find the difference &#8211; start at 12 and count back 6. The arrow ending at 6 shows the difference.<\/p>\n<p>Question 10.<br \/>\n___ = 10 &#8211; 8<br \/>\nAnswer :<br \/>\n10 &#8211; 8 = 2<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50876\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Count-On-and-Count-Back-to-Subtract-Homework-amp-Practice-2.5-Question-10.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Count-On-and-Count-Back-to-Subtract-Homework-&amp;-Practice-2.5-Question-10\" width=\"801\" height=\"113\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Count-On-and-Count-Back-to-Subtract-Homework-amp-Practice-2.5-Question-10.jpg 801w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Count-On-and-Count-Back-to-Subtract-Homework-amp-Practice-2.5-Question-10-300x42.jpg 300w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Count-On-and-Count-Back-to-Subtract-Homework-amp-Practice-2.5-Question-10-768x108.jpg 768w\" sizes=\"(max-width: 801px) 100vw, 801px\" \/><br \/>\nExplanation :<br \/>\nCount back to find the difference &#8211; start at 10 and count back 8. The arrow ending at 2 shows the difference.<\/p>\n<p>Question 11.<br \/>\n__ = 8 &#8211; 5<br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50882\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Count-On-and-Count-Back-to-Subtract-Homework-Practice-2.5-Question-11.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Count-On-and-Count-Back-to-Subtract-Homework-&amp;-Practice-2.5-Question-11\" width=\"792\" height=\"114\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Count-On-and-Count-Back-to-Subtract-Homework-Practice-2.5-Question-11.jpg 792w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Count-On-and-Count-Back-to-Subtract-Homework-Practice-2.5-Question-11-300x43.jpg 300w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Count-On-and-Count-Back-to-Subtract-Homework-Practice-2.5-Question-11-768x111.jpg 768w\" sizes=\"(max-width: 792px) 100vw, 792px\" \/><br \/>\nExplanation :<br \/>\nCount back to find the difference &#8211; start at 11 and count back 5. The arrow ending at 3 shows the difference.<\/p>\n<p>Question 12.<br \/>\n__ = 12 &#8211; 3<br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50883\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Count-On-and-Count-Back-to-Subtract-Homework-amp-Practice-2.5-Question-12.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Count-On-and-Count-Back-to-Subtract-Homework-&amp;-Practice-2.5-Question-12\" width=\"786\" height=\"127\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Count-On-and-Count-Back-to-Subtract-Homework-amp-Practice-2.5-Question-12.jpg 786w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Count-On-and-Count-Back-to-Subtract-Homework-amp-Practice-2.5-Question-12-300x48.jpg 300w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Count-On-and-Count-Back-to-Subtract-Homework-amp-Practice-2.5-Question-12-768x124.jpg 768w\" sizes=\"(max-width: 786px) 100vw, 786px\" \/><br \/>\nExplanation :<br \/>\nCount back to find the difference &#8211; start at 12 and count back 3. The arrow ending at 9 shows the difference.<\/p>\n<p>Question 13.<br \/>\n<strong>DIG DEEPER!<\/strong><br \/>\nComplete the squares so the differences on the outside are correct.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18734\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-113.png\" alt=\"Big Ideas Math Answers 2nd Grade Chapter 2 Fluency and Strategies within 20 113\" width=\"164\" height=\"158\" \/><br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50884\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Count-On-and-Count-Back-to-Subtract-Homework-amp-Practice-2.5-Question-13.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Count-On-and-Count-Back-to-Subtract-Homework-&amp;-Practice-2.5-Question-13\" width=\"215\" height=\"206\" \/><br \/>\nExplanation :<br \/>\n9 &#8211; 4 = 5<br \/>\n7 &#8211; 4 = 3<br \/>\n9 &#8211; 7 = 2<br \/>\n4 &#8211; 4 = 0<br \/>\nAll above equations are correct<\/p>\n<p>Question 14.<br \/>\n<strong>Modeling Real Life<\/strong><br \/>\n15 kids are in line to play four square. 7 of them leave. How many kids are left?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18735\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-114.png\" alt=\"Big Ideas Math Answers 2nd Grade Chapter 2 Fluency and Strategies within 20 114\" width=\"211\" height=\"164\" \/><br \/>\nAnswer :<br \/>\nNumber of kids = 15<br \/>\nNumber of kids left the play = 7<br \/>\nNumber of kids left to play = 15 &#8211; 7 = 8<\/p>\n<p>Question 15.<br \/>\n<strong>Modeling Real Life<\/strong><br \/>\nNewton has 6 pieces of macaroni. Descartes has 15. How many fewer pieces does Newton have than Descartes?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18736\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-115.png\" alt=\"Big Ideas Math Answers 2nd Grade Chapter 2 Fluency and Strategies within 20 115\" width=\"169\" height=\"188\" \/><br \/>\nAnswer :<br \/>\nNumber of pieces of macaroni with Newton = 6<br \/>\nNumber of pieces of macaroni with Descartes = 15<br \/>\nNumber of fewer pieces does Newton have than Descartes = 15 &#8211; 6 = 9<br \/>\nTherefore , Newton 9 fewer pieces than Descartes .<\/p>\n<p>Question 16.<br \/>\n<strong>Precision<\/strong><br \/>\nDraw more lines to show fourths.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18737\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-116.png\" alt=\"Big Ideas Math Answers 2nd Grade Chapter 2 Fluency and Strategies within 20 116\" width=\"124\" height=\"113\" \/><\/p>\n<h3><a id=\"Lesson_2.6_Relate_Addition_and_Subtraction\"><\/a>Lesson 2.6 Relate Addition and Subtraction<\/h3>\n<p><strong>Explore and Grow<\/strong><\/p>\n<p>Write an addition equation. Complete the part-part-whole model to match. Write a related subtraction equation.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18738\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-117.png\" alt=\"Big Ideas Math Answers 2nd Grade Chapter 2 Fluency and Strategies within 20 117\" width=\"313\" height=\"507\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-117.png 313w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-117-185x300.png 185w\" sizes=\"(max-width: 313px) 100vw, 313px\" \/><br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-49748\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.6-Relate-Addition-Subtraction-Explore-Grow.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.6-Relate-Addition-Subtraction-Explore-Grow\" width=\"319\" height=\"527\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.6-Relate-Addition-Subtraction-Explore-Grow.jpg 319w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.6-Relate-Addition-Subtraction-Explore-Grow-182x300.jpg 182w\" sizes=\"(max-width: 319px) 100vw, 319px\" \/><br \/>\nExplanation :<br \/>\nAddition and subtraction\u00a0are\u00a0inverse\u00a0operations because one operation can &#8220;undo&#8221; the other operation.<br \/>\nAdding 9 and 6 to get 15 is the opposite of 15 minus 9, leaving 6 or the opposite of 15 minus 6, leaving 9<\/p>\n<p><strong>Show and Grow<\/strong><\/p>\n<p>Question 1.<br \/>\n5 + 3 = ___<br \/>\n8 &#8211; 5 = ___<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18739\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-118.png\" alt=\"Big Ideas Math Answers 2nd Grade Chapter 2 Fluency and Strategies within 20 118\" width=\"218\" height=\"144\" \/><br \/>\nAnswer :<br \/>\n5 + 3 = 8<br \/>\n8 &#8211; 5 = 3<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-49749\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.6-Relate-Addition-Subtraction-Show-Grow-Question-1.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.6-Relate-Addition-Subtraction-Show-Grow-Question-1\" width=\"252\" height=\"174\" \/><br \/>\nExplanation :<br \/>\nAddition and subtraction\u00a0are\u00a0inverse\u00a0operations because one operation can &#8220;undo&#8221; the other operation.<br \/>\nAdding 5 and 3 to get 8 is the opposite of 8 minus 5, leaving 3 or the opposite of 8 minus 3, leaving 5<\/p>\n<p>Question 2.<br \/>\n4 + 7 = __<br \/>\n11 &#8211; 4 = ___<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18747\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-119.png\" alt=\"Big Ideas Math Answers 2nd Grade Chapter 2 Fluency and Strategies within 20 119\" width=\"214\" height=\"143\" \/><\/p>\n<p>Answer :<br \/>\n4 + 7 = 11<br \/>\n11 &#8211; 4 = 7<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-49750\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.6-Relate-Addition-Subtraction-Show-Grow-Question-2.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.6-Relate-Addition-Subtraction-Show-Grow-Question-2\" width=\"235\" height=\"169\" \/><br \/>\nExplanation :<br \/>\nAddition and subtraction\u00a0are\u00a0inverse\u00a0operations because one operation can &#8220;undo&#8221; the other operation.<br \/>\nAdding 4 and 7 to get 11 is the opposite of 11 minus 4, leaving 7 or the opposite of 11 minus 7, leaving 4<\/p>\n<p>Question 3.<br \/>\n3 + 9 = ___<br \/>\n12 &#8211; 3 = ___<br \/>\nAnswer :<br \/>\n3 + 9 = 12<br \/>\n12 &#8211; 3 = 9<br \/>\nExplanation :<br \/>\nAddition and subtraction\u00a0are\u00a0inverse\u00a0operations because one operation can &#8220;undo&#8221; the other operation.<br \/>\nAdding 3 and 9 to get 12 is the opposite of 12 minus 9, leaving 3 or the opposite of 12 minus 3, leaving 9<\/p>\n<p>Question 4.<br \/>\n8 + 6 = ___<br \/>\n14 &#8211; 8 = ___<br \/>\nAnswer :<br \/>\n8 + 6 = 14<br \/>\n14 &#8211; 8 = 6<br \/>\nExplanation :<br \/>\nAddition and subtraction\u00a0are\u00a0inverse\u00a0operations because one operation can &#8220;undo&#8221; the other operation.<br \/>\nAdding 8 and 6 to get 14 is the opposite of 14 minus 8, leaving 6 or the opposite of 14 minus 6, leaving 8<\/p>\n<p>Question 5.<br \/>\n7 + 8 = ___<br \/>\n15 &#8211; 7 = ___<br \/>\nAnswer :<br \/>\n7 + 8 = 15<br \/>\n15 &#8211; 7 = 8<br \/>\nExplanation :<br \/>\nAddition and subtraction\u00a0are\u00a0inverse\u00a0operations because one operation can &#8220;undo&#8221; the other operation.<br \/>\nAdding 7 and 8 to get 15 is the opposite of 15 minus 7, leaving 8 or the opposite of 15 minus 8, leaving 7<\/p>\n<p>Question 6.<br \/>\n9 + 9 = ___<br \/>\n18 &#8211; 9 = ___<br \/>\nAnswer :<br \/>\n9 + 9 = 18<br \/>\n18 &#8211; 9 = 9<br \/>\nExplanation :<br \/>\nAddition and subtraction\u00a0are\u00a0inverse\u00a0operations because one operation can &#8220;undo&#8221; the other operation.<br \/>\nAdding 9 and 9 to get 18 is the opposite of 18 minus 9, leaving 9<\/p>\n<p>Question 7.<br \/>\n4 + 5 = ___<br \/>\n9 &#8211; 4 = ___<br \/>\nAnswer :<br \/>\n4 + 5 = 9<br \/>\n9 &#8211; 4 = 5<br \/>\nExplanation :<br \/>\nAddition and subtraction\u00a0are\u00a0inverse\u00a0operations because one operation can &#8220;undo&#8221; the other operation.<br \/>\nAdding 4 and 5 to get 9 is the opposite of 9 minus 4, leaving 5 or the opposite of 9 minus 5, leaving 4<\/p>\n<p>Question 8.<br \/>\n5 + 7 = __<br \/>\n12 &#8211; 7 = ___<br \/>\nAnswer :<br \/>\n5 + 7 = 12<br \/>\n12 &#8211; 7 = 5<br \/>\nExplanation :<br \/>\nAddition and subtraction\u00a0are\u00a0inverse\u00a0operations because one operation can &#8220;undo&#8221; the other operation.<br \/>\nAdding 5 and 7 to get 12 is the opposite of 12 minus 7, leaving 5 or the opposite of 12 minus 5, leaving 7<\/p>\n<p>Question 9.<br \/>\n8 + 8 = ___<br \/>\n16 &#8211; 8 = ___<br \/>\nAnswer :<br \/>\n8 + 8 = 16<br \/>\n16 &#8211; 8 = 8<br \/>\nExplanation :<br \/>\nAddition and subtraction\u00a0are\u00a0inverse\u00a0operations because one operation can &#8220;undo&#8221; the other operation.<br \/>\nAdding 8 and 8 to get 16 is the opposite of 16 minus 8, leaving 8<\/p>\n<p>Question 10.<br \/>\n5 + 2 = ___<br \/>\n7 &#8211; 2 = ___<br \/>\nAnswer :<br \/>\n5 + 2 = 7<br \/>\n7 &#8211; 2 = 5<br \/>\nExplanation :<br \/>\nAddition and subtraction\u00a0are\u00a0inverse\u00a0operations because one operation can &#8220;undo&#8221; the other operation.<br \/>\nAdding 5 and 2 to get 7 is the opposite of 7 minus 2, leaving 5 or the opposite of 7 minus 5, leaving 2<\/p>\n<p>Question 11.<br \/>\n4 + 6 = ___<br \/>\n10 &#8211; 4 = ___<br \/>\nAnswer :<br \/>\n4 + 6 = 10<br \/>\n10 &#8211; 4 = 6<br \/>\nExplanation :<br \/>\nAddition and subtraction\u00a0are\u00a0inverse\u00a0operations because one operation can &#8220;undo&#8221; the other operation.<br \/>\nAdding 4 and 6 to get 10 is the opposite of 10 minus 4, leaving 6 or the opposite of 10 minus 6, leaving 4<\/p>\n<p>Question 12.<br \/>\n2 + 6 = ___<br \/>\n8 &#8211; 2 = ___<br \/>\nAnswer :<br \/>\n2 + 6 = 8<br \/>\n8 &#8211; 2 = 6<br \/>\nExplanation :<br \/>\nAddition and subtraction\u00a0are\u00a0inverse\u00a0operations because one operation can &#8220;undo&#8221; the other operation.<br \/>\nAdding 2 and 6 to get 8 is the opposite of 8 minus 2, leaving 6 or the opposite of 8 minus 6, leaving 2<\/p>\n<p>Question 13.<br \/>\n7 + 7 = ___<br \/>\n14 &#8211; 7 = ___<br \/>\nAnswer :<br \/>\n7 + 7 = 14<br \/>\n14 &#8211; 7 = 7<br \/>\nExplanation :<br \/>\nAddition and subtraction\u00a0are\u00a0inverse\u00a0operations because one operation can &#8220;undo&#8221; the other operation.<br \/>\nAdding 7 and 7 to get 14 is the opposite of 14 minus 7, leaving 7<\/p>\n<p>Question 14.<br \/>\n6 + 5 = ___<br \/>\n11 &#8211; 6 = ___<br \/>\nAnswer :<br \/>\n6 + 5 = 11<br \/>\n11 &#8211; 6 = 5<br \/>\nExplanation :<br \/>\nAddition and subtraction\u00a0are\u00a0inverse\u00a0operations because one operation can &#8220;undo&#8221; the other operation.<br \/>\nAdding 6 and 5 to get 11 is the opposite of 11 minus 5, leaving 6 or the opposite of 11 minus 6, leaving 5<\/p>\n<p>Question 15.<br \/>\n9 + 6 = ___<br \/>\n15 &#8211; 6 = __<br \/>\nAnswer :<br \/>\n9 + 6 = 15<br \/>\n15 &#8211; 6 = 9<br \/>\nExplanation :<br \/>\nAddition and subtraction\u00a0are\u00a0inverse\u00a0operations because one operation can &#8220;undo&#8221; the other operation.<br \/>\nAdding 9 and 6 to get 15 is the opposite of 15 minus 9, leaving 6 or the opposite of 15 minus 6, leaving 9<\/p>\n<p>Question 16.<br \/>\n3 + 8 = ___<br \/>\n11 &#8211; 8 = ___<br \/>\n11 &#8211; 3 = __<br \/>\nAnswer :<br \/>\n3 + 8 = 11<br \/>\n11 &#8211; 8 = 3<br \/>\n11 &#8211; 3 = 8<br \/>\nExplanation :<br \/>\nAddition and subtraction\u00a0are\u00a0inverse\u00a0operations because one operation can &#8220;undo&#8221; the other operation.<br \/>\nAdding 3 and 8 to get 11 is the opposite of 11 minus 8, leaving 3 or the opposite of 11 minus 3, leaving 8<\/p>\n<p>Question 17.<br \/>\n9 + 7 = ___<br \/>\n16 &#8211; 9 = ___<br \/>\n16 &#8211; 7 = ___<br \/>\nAnswer :<br \/>\n9 + 7 = 16<br \/>\n16 &#8211; 9 = 7<br \/>\n16 &#8211; 7 = 9<br \/>\nExplanation :<br \/>\nAddition and subtraction\u00a0are\u00a0inverse\u00a0operations because one operation can &#8220;undo&#8221; the other operation.<br \/>\nAdding 9 and 7 to get 16 is the opposite of 16 minus 9, leaving 7 or the opposite of 16 minus 7, leaving 9<\/p>\n<p>Question 18.<br \/>\n8 + 5 = ___<br \/>\n13 &#8211; 5 = ___<br \/>\n13 &#8211; 8 = ___<br \/>\nAnswer :<br \/>\n8 + 5 = 13<br \/>\n13 &#8211; 5 = 8<br \/>\n13 &#8211; 8 = 5<br \/>\nExplanation :<br \/>\nAddition and subtraction\u00a0are\u00a0inverse\u00a0operations because one operation can &#8220;undo&#8221; the other operation.<br \/>\nAdding 8 and 5 to get 13 is the opposite of 13 minus 5, leaving 8 or the opposite of 13 minus 8, leaving 5<\/p>\n<p>Question 19.<br \/>\n<strong>Structure<\/strong><br \/>\nComplete the number bond. Write related addition and subtraction equations.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18749\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-120.png\" alt=\"Big Ideas Math Answers 2nd Grade Chapter 2 Fluency and Strategies within 20 120\" width=\"560\" height=\"177\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-120.png 560w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-120-300x95.png 300w\" sizes=\"(max-width: 560px) 100vw, 560px\" \/><br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-49751\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.6-Relate-Addition-Subtraction-Show-Grow-Question-19.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.6-Relate-Addition-Subtraction-Show-Grow-Question-19\" width=\"560\" height=\"177\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.6-Relate-Addition-Subtraction-Show-Grow-Question-19.jpg 560w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.6-Relate-Addition-Subtraction-Show-Grow-Question-19-300x95.jpg 300w\" sizes=\"(max-width: 560px) 100vw, 560px\" \/><br \/>\nExplanation :<br \/>\nAddition and subtraction\u00a0are\u00a0inverse\u00a0operations because one operation can &#8220;undo&#8221; the other operation.<br \/>\nAdding 7 and 8 to get 15 is the opposite of 15 minus 7, leaving 8 or the opposite of 15 minus 8, leaving 7<\/p>\n<p><strong>Think and Grow: Modeling Real Life<\/strong><\/p>\n<p>You have 17 glow sticks. You give away 9 of them. How many glow sticks do you have left?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18758\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-121.png\" alt=\"Big Ideas Math Answers 2nd Grade Chapter 2 Fluency and Strategies within 20 121\" width=\"125\" height=\"139\" \/><br \/>\nWhich addition fact can help you subtract?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18760\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-123.png\" alt=\"Big Ideas Math Answers 2nd Grade Chapter 2 Fluency and Strategies within 20 123\" width=\"550\" height=\"156\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-123.png 550w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-123-300x85.png 300w\" sizes=\"(max-width: 550px) 100vw, 550px\" \/><br \/>\nAnswer :<br \/>\nNumber of Glow sticks = 17<br \/>\nNumber of glow sticks given away = 9<br \/>\nNumber of glow sticks left = 17 &#8211; 9 = 8<\/p>\n<p><strong>Show and Grow<\/strong><\/p>\n<p>Question 20.<br \/>\nA box of sidewalk chalk has 20 pieces. You use 10 of them. How many pieces are not used?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-19010\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-124.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 124\" width=\"188\" height=\"147\" \/><br \/>\nAnswer :<br \/>\nNumber of chalks = 20<br \/>\nNumber of chalks used = 10<br \/>\nNumber of chalks not used = 20 &#8211; 10 = 10<\/p>\n<p>Question 21.<br \/>\nThere are 7 more butter\ufb02ies than birds. There are 8 birds. How many butter\ufb02ies are there?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18761\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-125.png\" alt=\"Big Ideas Math Answers 2nd Grade Chapter 2 Fluency and Strategies within 20 125\" width=\"174\" height=\"111\" \/><br \/>\nAnswer :<br \/>\nNumber of birds = 8<br \/>\nNumber of butterflies = 7 more butter\ufb02ies than birds = 7 + 8 = 15<\/p>\n<p>Question 22.<br \/>\nA kitchen drawer has 9 fewer forks than spoons. There are 15 spoons. How many forks are there?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18762\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-126.png\" alt=\"Big Ideas Math Answers 2nd Grade Chapter 2 Fluency and Strategies within 20 126\" width=\"137\" height=\"50\" \/><br \/>\nAnswer :<br \/>\nNumber of spoons = 15<br \/>\nNumber of forks = 9 fewer forks than spoons = 15 &#8211; 9 = 6<\/p>\n<h3><a id=\"Relate_Addition_and_Subtraction_Homework_&amp;_Practice_2.6\"><\/a>Relate Addition and Subtraction Homework &amp; Practice 2.6<\/h3>\n<p>Question 1.<br \/>\n5 + 5 = ___<br \/>\n10 &#8211; 5 = ___<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18763\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answers-2nd-Grade-Chapter-2-Fluency-and-Strategies-within-20-127.png\" alt=\"Big Ideas Math Answers 2nd Grade Chapter 2 Fluency and Strategies within 20 127\" width=\"214\" height=\"152\" \/><br \/>\nAnswer :<br \/>\n5 + 5 = 10<br \/>\n10 &#8211; 5 = 5<br \/>\n<img loading=\"lazy\" class=\"alignnone wp-image-49752 size-full\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Relate-Addition-Subtraction-Homework-Practice-2.6-Question-1.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Relate-Addition-Subtraction-Homework-Practice-2.6-Question-1\" width=\"224\" height=\"181\" \/><br \/>\nExplanation :<br \/>\nAddition and subtraction\u00a0are\u00a0inverse\u00a0operations because one operation can &#8220;undo&#8221; the other operation.<br \/>\nAdding 5 and 5 to get 10 is the opposite of 10 minus 5, leaving 5<\/p>\n<p>Question 2.<br \/>\n5 + 8 = ___<br \/>\n13 &#8211; 8 = ___<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18617\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-128.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 128\" width=\"216\" height=\"147\" \/><br \/>\nAnswer :<br \/>\n5 + 8 = 13<br \/>\n13 &#8211; 8 = 5<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-49753\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Relate-Addition-Subtraction-Homework-Practice-2.6-Question-2.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Relate-Addition-Subtraction-Homework-Practice-2.6-Question-2\" width=\"224\" height=\"181\" \/><\/p>\n<p>Explanation :<br \/>\nAddition and subtraction\u00a0are\u00a0inverse\u00a0operations because one operation can &#8220;undo&#8221; the other operation.<br \/>\nAdding 5 and 8 to get 13 is the opposite of 13 minus 5, leaving\u00a0 8 or the opposite of 13 minus 8, leaving 4<\/p>\n<p>Question 3.<br \/>\n3 + 4 = ___<br \/>\n7 &#8211; 3 = ___<br \/>\nAnswer :<br \/>\n3 + 4 = 7<br \/>\n7 &#8211; 3 = 4<\/p>\n<p>Explanation :<br \/>\nAddition and subtraction\u00a0are\u00a0inverse\u00a0operations because one operation can &#8220;undo&#8221; the other operation.<br \/>\nAdding 3 and 4 to get 7 is the opposite of 7 minus 3, leaving\u00a0 4 or the opposite of 7 minus 4, leaving 3<\/p>\n<p>Question 4.<br \/>\n8 + 6 = __<br \/>\n14 &#8211; 6 = ___<br \/>\nAnswer :<br \/>\n8 + 6 = 14<br \/>\n14 &#8211; 6 = 8<br \/>\nExplanation :<br \/>\nAddition and subtraction\u00a0are\u00a0inverse\u00a0operations because one operation can &#8220;undo&#8221; the other operation.<br \/>\nAdding 8 and 6 to get 14 is the opposite of 14 minus 6, leaving 8 or the opposite of 14 minus 8, leaving 6<\/p>\n<p>Question 5.<br \/>\n6 + 6 = ___<br \/>\n12 &#8211; 6 = ___<br \/>\nAnswer :<br \/>\n6 + 6 = 12<br \/>\n12 &#8211; 6 = 6<br \/>\nExplanation :<br \/>\nAddition and subtraction\u00a0are\u00a0inverse\u00a0operations because one operation can &#8220;undo&#8221; the other operation.<br \/>\nAdding 6 and 6 to get 12 is the opposite of 12 minus 6, leaving 6<\/p>\n<p>Question 6.<br \/>\n5 + 6 = ___<br \/>\n11 &#8211; 6 = __<br \/>\n11 &#8211; 5 = ___<br \/>\nAnswer :<br \/>\n5 + 6 = 11<br \/>\n11 &#8211; 6 = 5<br \/>\n11 &#8211; 5 = 6<br \/>\nExplanation :<br \/>\nAddition and subtraction\u00a0are\u00a0inverse\u00a0operations because one operation can &#8220;undo&#8221; the other operation.<br \/>\nAdding 5 and 6 to get 11 is the opposite of 11 minus 6, leaving 5 or the opposite of 11 minus 5, leaving 6<\/p>\n<p>Question 7.<br \/>\n9 + 8 = ___<br \/>\n17 &#8211; 9 = ___<br \/>\n17 &#8211; 8 = ___<br \/>\nAnswer :<br \/>\n9 + 8 = 17<br \/>\n17 &#8211; 9 = 8<br \/>\n17 &#8211; 8 = 9<br \/>\nExplanation :<br \/>\nAddition and subtraction\u00a0are\u00a0inverse\u00a0operations because one operation can &#8220;undo&#8221; the other operation.<br \/>\nAdding 9 and 8 to get 17 is the opposite of 17 minus 9, leaving 8 or the opposite of 17 minus 8, leaving 9<\/p>\n<p>Question 8.<br \/>\n7 + 9 = ___<br \/>\n16 &#8211; 9 = ___<br \/>\n16 &#8211; 7 = ___<br \/>\nAnswer :<br \/>\n7 + 9 = 16<br \/>\n16 &#8211; 9 = 7<br \/>\n16 &#8211; 7 = 9<br \/>\nExplanation :<br \/>\nAddition and subtraction\u00a0are\u00a0inverse\u00a0operations because one operation can &#8220;undo&#8221; the other operation.<br \/>\nAdding 7 and 9 to get 16 is the opposite of 16 minus 9, leaving 7 or the opposite of 16 minus 7, leaving 9<\/p>\n<p>Question 9.<br \/>\n<strong>Number Sense<\/strong><br \/>\nFind the sums. Write a related subtraction equation for each addition equation.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18618\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-129.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 129\" width=\"580\" height=\"96\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-129.png 580w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-129-300x50.png 300w\" sizes=\"(max-width: 580px) 100vw, 580px\" \/><br \/>\nAnswer :<br \/>\n4 + 9 = 13 and 13 &#8211; 4 = 9<br \/>\n7 + 5 = 12 and 12 &#8211; 7 = 5<br \/>\nExplanation :<br \/>\nAddition and subtraction\u00a0are\u00a0inverse\u00a0operations because one operation can &#8220;undo&#8221; the other operation.<br \/>\nAdding 4 and 9 to get 13 is the opposite of 13 minus 4, leaving 9<br \/>\nAddition and subtraction\u00a0are\u00a0inverse\u00a0operations because one operation can &#8220;undo&#8221; the other operation.<br \/>\nAdding 7 and 5 to get 12 is the opposite of 12 minus 7, leaving 5<\/p>\n<p>Question 10.<br \/>\n<strong>Modeling Real Life<\/strong><br \/>\nYou have 13 colors of modeling clay. You use 7 of them to make a sculpture. How many colors are not used?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18619\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-130.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 130\" width=\"153\" height=\"143\" \/><br \/>\nAnswer :<br \/>\nNumber of colors with me = 13<br \/>\nNumber of colors used = 7<br \/>\nNumber of colors not used = 13 &#8211; 7 = 6 colors<\/p>\n<p>Question 11.<br \/>\n<strong>Modeling Real Life<\/strong><br \/>\nThere are 7 more snails than caterpillars. There are 4 caterpillars. How many snails are there?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18620\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-131.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 131\" width=\"165\" height=\"153\" \/><br \/>\nAnswer :<br \/>\nNumber of caterpillars = 4<br \/>\nNumber of snails = 7 more snails than caterpillars.\u00a0 = 7 + 4 = 11<\/p>\n<p>Question 12.<br \/>\nYou have 6 bears. Some are brown. The rest are black. You have more brown bears than black bears. How many brown and black bears can you have?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18621\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-132.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 132\" width=\"394\" height=\"94\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-132.png 394w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-132-300x72.png 300w\" sizes=\"(max-width: 394px) 100vw, 394px\" \/><br \/>\nShow how you know:<br \/>\nAnswer :<br \/>\nOption 1 and Option 4<br \/>\nExplanation :<br \/>\nNumber of bears = 6<br \/>\nbrown bears &gt; black bears<br \/>\nwe cant say the exact number of black or brown bears but as per options we can solve<br \/>\nOption 1 &#8211; 5 brown and 1 black satisfy the condition.<br \/>\nOption 4 &#8211; 4 brown and 2 black satisfy the condition.<br \/>\nbrown bears &gt; black bears<\/p>\n<h3><a id=\"Lesson_2.7_Get_to_10_to_Subtract\"><\/a>Lesson 2.7 Get to 10 to Subtract<\/h3>\n<p><strong>Explore and Grow<\/strong><\/p>\n<p>How can you use the number line to \ufb01nd the missing number?<\/p>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-18622\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-133.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 133\" width=\"533\" height=\"257\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-133.png 533w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-133-300x145.png 300w\" sizes=\"(max-width: 533px) 100vw, 533px\" \/><br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50885\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.7-Get-to-10-to-Subtract-Explore-Grow.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.7-Get-to-10-to-Subtract-Explore-Grow\" width=\"722\" height=\"351\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.7-Get-to-10-to-Subtract-Explore-Grow.jpg 722w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.7-Get-to-10-to-Subtract-Explore-Grow-300x146.jpg 300w\" sizes=\"(max-width: 722px) 100vw, 722px\" \/><br \/>\nExplanation :<br \/>\nNumber of linking arrows represent the subtrahend of above equation = 4<\/p>\n<p><strong>Show and Grow<\/strong><\/p>\n<p>Get to 10 to subtract.<\/p>\n<p>Question 1.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18623\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-134.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 134\" width=\"231\" height=\"221\" \/><br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50011\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.7-Get-to-10-to-Subtract-Show-Grow-Question-1.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20- Lesson 2.7-Get-to-10-to-Subtract-Show-Grow-Question-1\" width=\"231\" height=\"221\" \/><br \/>\nExplanation :<br \/>\nThe subtrahend 6 is written as 3 + 3 so that the Minuend 13 is subtracted with 3 to get 10. then 3 is subtracted from 10 , we get difference as 7.<\/p>\n<p>Question 2.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18624\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-135.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 135\" width=\"229\" height=\"214\" \/><br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50012\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.7-Get-to-10-to-Subtract-Show-Grow-Question-2.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20- Lesson 2.7-Get-to-10-to-Subtract-Show-Grow-Question-2\" width=\"229\" height=\"214\" \/><br \/>\nExplanation :<br \/>\nThe subtrahend 8 is written as 2 + 6 so that the Minuend 12 is subtracted with 2 to get 10. then 6 is subtracted from 10 , we get difference as 4.<\/p>\n<p>Question 3.<br \/>\n14 &#8211; 8 = ?<br \/>\n10 &#8211; __ = __<br \/>\nSo, 14 &#8211; 8 = ___.<br \/>\nAnswer :<br \/>\n14 &#8211; 8<br \/>\n14- (4 + 4)<br \/>\n10 &#8211; 4 = 6<br \/>\nSo, 14 &#8211; 8 = 6<br \/>\nExplanation :<br \/>\nThe subtrahend 8 is written as 4 + 4 so that the Minuend 14 is subtracted with 4 to get 10. then 4 is subtracted from 10 , we get difference as 6.<\/p>\n<p>Question 4.<br \/>\n16 &#8211; 7 = ?<br \/>\n10 &#8211; __ = __<br \/>\nSo, 16 &#8211; 7 = ___<br \/>\nAnswer :<br \/>\n16 &#8211; 7<br \/>\n16 &#8211; (6 + 1 )<br \/>\n10 &#8211; 1= 9<br \/>\nSo, 16 &#8211; 7 = 9<br \/>\nExplanation :<br \/>\nThe subtrahend 7 is written as 6 + 1 so that the Minuend 16 is subtracted with 6 to get 10. then 1 is subtracted from 10 , we get difference as 9.<\/p>\n<p><strong>Apply and Grow: Practice<\/strong><\/p>\n<p>Get to 10 to subtract.<\/p>\n<p>Question 5.<br \/>\n12 &#8211; 6 = ?<br \/>\n10 &#8211; __ = __<br \/>\nSo, 12 &#8211; 6 = __<br \/>\nAnswer :<br \/>\n12 &#8211; 6 =<br \/>\n12 &#8211; (2 + 4 )<br \/>\n10 &#8211; 4 = 6<br \/>\nSo, 12 &#8211; 6 = 6<br \/>\nExplanation :<br \/>\nThe subtrahend 6 is written as 2 + 4 so that the Minuend 12 is subtracted with 2 to get 10. then 4 is subtracted from 10 , we get difference as 6.<\/p>\n<p>Question 6.<br \/>\n13 &#8211; 7 = __<br \/>\n10 &#8211; __ = __<br \/>\nSo, 13 &#8211; 7 = ___<br \/>\nAnswer :<br \/>\n13 &#8211; 7 =<br \/>\n13 &#8211; (3 + 4)<br \/>\n10 &#8211; 4 = 6<br \/>\nSo, 13 &#8211; 7 = 6<br \/>\nExplanation :<br \/>\nThe subtrahend 7 is written as 3 + 4 so that the Minuend 13 is subtracted with 3 to get 10. then 4 is subtracted from 10 , we get difference as 6.<\/p>\n<p>Question 7.<br \/>\n15 &#8211; 9 = ?<br \/>\n10 &#8211; __ = ___<br \/>\nSo, 15 &#8211; 9 = ___<br \/>\nAnswer :<br \/>\n15 &#8211; 9 =<br \/>\n15 &#8211; (5 + 4)<br \/>\n10 &#8211; 4 = 6<br \/>\nSo, 15 &#8211; 9 = 6<br \/>\nExplanation :<br \/>\nThe subtrahend 9 is written as 5 + 4 so that the Minuend 15 is subtracted with 5 to get 10. then 4 is subtracted from 10 , we get difference as 6.<\/p>\n<p>Question 8.<br \/>\n14 &#8211; 6 = ?<br \/>\n10 &#8211; __ = __<br \/>\nSo, 14 &#8211; 6 = __<br \/>\nAnswer :<br \/>\n14 &#8211; 6 =<br \/>\n14 &#8211; ( 4 + 2 )<br \/>\n10 &#8211; 2 = 8<br \/>\nSo, 14 &#8211; 6 = 8<br \/>\nExplanation :<br \/>\nThe subtrahend 6 is written as 4 + 2 so that the Minuend 14 is subtracted with 4 to get 10. then 2 is subtracted from 10 , we get difference as 8.<\/p>\n<p>Question 9.<br \/>\n13 &#8211; 8 = ___<br \/>\nAnswer :<br \/>\n13 &#8211; 8 =<br \/>\n13 &#8211; ( 3 + 5 )<br \/>\n10 &#8211; 5 = 5<br \/>\nSo, 13 &#8211; 8 = 5<br \/>\nExplanation :<br \/>\nThe subtrahend 8 is written as 3 + 5 so that the Minuend 13 is subtracted with 3 to get 10. then 5 is subtracted from 10 , we get difference as 5.<\/p>\n<p>Question 10.<br \/>\n12 &#8211; 4= ___<br \/>\nAnswer :<br \/>\n12 &#8211; 4 =<br \/>\n12 &#8211; ( 2 + 2 )<br \/>\n10 &#8211; 2 = 8<br \/>\nSo, 12 &#8211; 4 = 8<br \/>\nExplanation :<br \/>\nThe subtrahend 4 is written as 2 + 2 so that the Minuend 12 is subtracted with 2 to get 10. then 2 is subtracted from 10 , we get difference as 8.<\/p>\n<p>Question 11.<br \/>\n17 &#8211; 9 = __<br \/>\nAnswer :<br \/>\n17 &#8211; 9 =<br \/>\n17 &#8211; ( 7 + 2 )<br \/>\n10 &#8211; 2 = 8<br \/>\nSo, 17 &#8211; 9 = 8<br \/>\nExplanation :<br \/>\nThe subtrahend 9 is written as 7 + 2 so that the Minuend 17 is subtracted with 7 to get 10. then 2 is subtracted from 10 , we get difference as 8.<\/p>\n<p>Question 12.<br \/>\n15 &#8211; 8 = __<br \/>\nAnswer :<br \/>\n15 &#8211; 8 =<br \/>\n15 &#8211; ( 5 + 3 )<br \/>\n10 &#8211; 3 = 7<br \/>\nSo, 15 &#8211; 8 = 7<br \/>\nExplanation :<br \/>\nThe subtrahend 8 is written as 5 + 23 so that the Minuend 15 is subtracted with 5 to get 10. then 3 is subtracted from 10 , we get difference as 7.<\/p>\n<p>Question 13.<br \/>\n12 &#8211; 7 = ___<br \/>\nAnswer :<br \/>\n12 &#8211; 7 =<br \/>\n12 &#8211; ( 2 + 5 )<br \/>\n10 &#8211; 5 = 5<br \/>\nSo, 12 &#8211; 7 = 5<br \/>\nExplanation :<br \/>\nThe subtrahend 7 is written as\u00a0 2 + 5 so that the Minuend 12 is subtracted with 2 to get 10. then 5 is subtracted from 10 , we get difference as 5.<\/p>\n<p>Question 14.<br \/>\n13 &#8211; 4 = ___<br \/>\nAnswer :<br \/>\n13 &#8211; 4 =<br \/>\n13 &#8211; ( 3 + 1 )<br \/>\n10 &#8211; 1 = 9<br \/>\nSo, 13 &#8211; 4 = 9<br \/>\nExplanation :<br \/>\nThe subtrahend 4 is written as 3 + 1 so that the Minuend 13 is subtracted with 3 to get 10. then 1 is subtracted from 10 , we get difference as 9.<\/p>\n<p>Question 15.<br \/>\n__ = 12 &#8211; 3<br \/>\nAnswer :<br \/>\n12 &#8211; 3 =<br \/>\n12 &#8211; ( 2 + 1 )<br \/>\n10 &#8211; 1 = 9<br \/>\nSo, 12 &#8211; 3 = 9<br \/>\nExplanation :<br \/>\nThe subtrahend 3 is written as 2 + 1 so that the Minuend 12 is subtracted with 2 to get 10. then 1 is subtracted from 10 , we get difference as 9.<\/p>\n<p>Question 16.<br \/>\n__ = 16 &#8211; 7<br \/>\nAnswer :<br \/>\n16 &#8211; 7 =<br \/>\n16 &#8211; ( 6 + 1 )<br \/>\n10 &#8211; 1 = 9<br \/>\nSo, 16 &#8211; 7 = 9<br \/>\nExplanation :<br \/>\nThe subtrahend 7 is written as 6 + 1 so that the Minuend 16 is subtracted with 6 to get 10. then 1 is subtracted from 10 , we get difference as 9.<\/p>\n<p>Question 17.<br \/>\n___ = 14 &#8211; 9<br \/>\nAnswer :<br \/>\n14 &#8211; 9 =<br \/>\n14 &#8211; ( 4 + 5 )<br \/>\n10 &#8211; 5 = 5<br \/>\nSo, 14 &#8211; 9 = 5<br \/>\nExplanation :<br \/>\nThe subtrahend 9 is written as 4 + 5 so that the Minuend 14 is subtracted with 4 to get 10. then 5 is subtracted from 10 , we get difference as 5.<\/p>\n<p>Question 18.<br \/>\n__ = 12 &#8211; 9<br \/>\nAnswer :<br \/>\n12 &#8211; 9 =<br \/>\n12 &#8211; ( 2 + 7 )<br \/>\n10 &#8211; 7 = 3<br \/>\nSo, 12 &#8211; 9 = 3<br \/>\nExplanation :<br \/>\nThe subtrahend 9 is written as 2 + 7 so that the Minuend 12 is subtracted with 2 to get 10. then 7 is subtracted from 10 , we get difference as 3.<\/p>\n<p>Question 19.<br \/>\n<strong>Number Sense<\/strong><br \/>\nHow can you get to 10 to \ufb01nd 13 \u22125?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18625\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-136.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 136\" width=\"455\" height=\"47\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-136.png 455w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-136-300x31.png 300w\" sizes=\"(max-width: 455px) 100vw, 455px\" \/><br \/>\nAnswer :<br \/>\n13 &#8211; 5 =<br \/>\n13 &#8211; ( 3 + 2 )<br \/>\n10 &#8211; 2 = 8<br \/>\nSo, 13 &#8211; 5 = 8<br \/>\nExplanation :<br \/>\nThe subtrahend 5 is written as 3+ 2 so that the Minuend 13 is subtracted with 3 to get 10. then 2 is subtracted from 10 , we get difference as 8.<\/p>\n<p><strong>Think and Grow: Modeling Real Life<\/strong><\/p>\n<p>A \ufb01rst-aid kit has 16 bandages. You use 7 of them. How many bandages are left?<br \/>\nEquation:<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18626\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-137.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 137\" width=\"184\" height=\"172\" \/><br \/>\nAnswer :<br \/>\nNumber of bandages = 16<br \/>\nNumber of used bandages = 7<br \/>\nNumber of bandages not used = 16 &#8211; 7 = 9<\/p>\n<p><strong>Show and Grow<\/strong><\/p>\n<p>Question 20.<br \/>\nThere are 12 elephants at a watering hole. 5 of them leave. How many elephants are left?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18627\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-138.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 138\" width=\"177\" height=\"157\" \/><br \/>\nAnswer :<br \/>\nNumber of Elephants at watering hole = 12<br \/>\nNumber of Elephants left the watering hole\u00a0 = 5<br \/>\nNumber of Elephants at Watering hole now = 12 &#8211; 5 = 7<\/p>\n<p>Question 21.<br \/>\n<strong>DIG DEEPER!<\/strong><br \/>\nThere are 17 hot-air balloons on the ground. 5 of them take off at 1:00. 4 more take off at 1:30. How many balloons are still on the ground?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18628\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-139.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 139\" width=\"176\" height=\"180\" \/><\/p>\n<p>Explain how you found the number of balloons still on the ground.<br \/>\n______________________________________<br \/>\n______________________________________<br \/>\nAnswer :<br \/>\nNumber of hot-air balloons on the ground = 17<br \/>\nNumber of balloons take off at 1 : 00 = 5<br \/>\nNumber of balloons take off at 1 : 30 = 4<br \/>\nNumber of balloons left on ground = 17 &#8211; 5 &#8211; 4 = 8<\/p>\n<h3><a id=\"Get_to_10_to_Subtract_Homework_&amp;_Practice_2.7\"><\/a>Get to 10 to Subtract Homework &amp; Practice 2.7<\/h3>\n<p>Get to 10 to subtract<\/p>\n<p>Question 1.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18629\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-140.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 140\" width=\"236\" height=\"221\" \/><br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50013\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Get-to-10-to-Subtract-Homework-Practice-2.7-Question-1.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Get-to-10-to-Subtract-Homework-Practice-2.7-Question-1\" width=\"236\" height=\"221\" \/><br \/>\nExplanation :<br \/>\nThe subtrahend 5 is written as 2+ 3 so that the Minuend 12 is subtracted with 2 to get 10. then 3 is subtracted from 10 , we get difference as 7.<\/p>\n<p>Question 2.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18630\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-141.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 141\" width=\"231\" height=\"223\" \/><br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50014\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Get-to-10-to-Subtract-Homework-Practice-2.7-Question-2.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Get-to-10-to-Subtract-Homework-Practice-2.7-Question-2\" width=\"231\" height=\"223\" \/><br \/>\nExplanation :<br \/>\nThe subtrahend 6 is written as 5+ 1 so that the Minuend 15 is subtracted with 5 to get 10. then 1 is subtracted from 10 , we get difference as 9.<\/p>\n<p>Question 3.<br \/>\n16 &#8211; 8 = ?<br \/>\n10 &#8211; __ = __<br \/>\nSo, 16 &#8211; 8 = __<br \/>\nAnswer :<br \/>\n16 &#8211; 8<br \/>\n16 &#8211; (6 + 2 )<br \/>\n10 &#8211; 2 = 8<br \/>\nSo, 16 &#8211; 8 = 8<br \/>\nExplanation :<br \/>\nThe subtrahend 8 is written as 6+ 2 so that the Minuend 16 is subtracted with 6 to get 10. then 2 is subtracted from 10 , we get difference as 8.<\/p>\n<p>Question 4.<br \/>\n13 &#8211; 9 = ?<br \/>\n10 &#8211; __ = ___<br \/>\nSo, 13 &#8211; 9 = ___<br \/>\nAnswer :<br \/>\n13 &#8211; 9<br \/>\n13 &#8211; ( 3 + 6 )<br \/>\n10 &#8211; 6 = 4<br \/>\nSo, 13 &#8211; 9 = 4<br \/>\nExplanation :<br \/>\nThe subtrahend 9 is written as 3+ 6 so that the Minuend 13 is subtracted with 3 to get 10. then 6 is subtracted from 10 , we get difference as 4.<\/p>\n<p>Question 5.<br \/>\n14 &#8211; 5 ___<br \/>\nAnswer :<br \/>\n14 &#8211; 5<br \/>\n14 &#8211; (4 + 1 )<br \/>\n10 &#8211; 1 = 9<br \/>\nSo, 14 &#8211; 5 = 9<br \/>\nExplanation :<br \/>\nThe subtrahend 5 is written as 4+ 1 so that the Minuend 14 is subtracted with 4 to get 10. then 1 is subtracted from 10 , we get difference as 9.<\/p>\n<p>Question 6.<br \/>\n16 &#8211; 7 = ___<br \/>\nAnswer :<br \/>\n16 &#8211; 7<br \/>\n16 &#8211; (6 + 1 )<br \/>\n10 &#8211; 1 = 9<br \/>\nSo, 16 &#8211; 7 = 9<br \/>\nExplanation :<br \/>\nThe subtrahend 7 is written as 6 + 1 so that the Minuend 16 is subtracted with 6 to get 10. then 1 is subtracted from 10 , we get difference as 9.<\/p>\n<p>Question 7.<br \/>\n12 &#8211; 8 = __<br \/>\nAnswer :<br \/>\n12 &#8211; 8<br \/>\n12 &#8211; (2 + 6 )<br \/>\n10 &#8211; 6 = 4<br \/>\nSo, 12 &#8211; 8 = 4<br \/>\nExplanation :<br \/>\nThe subtrahend 8 is written as 2+ 6 so that the Minuend 12 is subtracted with 2 to get 10. then 6 is subtracted from 10 , we get difference as 4.<\/p>\n<p>Question 8.<br \/>\n13 &#8211; 8 = __<br \/>\nAnswer :<br \/>\n13 &#8211; 8<br \/>\n13 &#8211; (3 + 5 )<br \/>\n10 &#8211; 5 = 5<br \/>\nSo, 13 &#8211; 8 = 5<br \/>\nExplanation :<br \/>\nThe subtrahend 8 is written as 3+ 5 so that the Minuend 13 is subtracted with 3 to get 10. then 5 is subtracted from 10 , we get difference as 5.<\/p>\n<p>Question 9.<br \/>\n__ = 16 &#8211; 9<br \/>\nAnswer :<br \/>\n16 &#8211; 9<br \/>\n16 &#8211; (6 + 3 )<br \/>\n10 &#8211; 3 = 7<br \/>\nSo, 16 &#8211; 9 = 7<br \/>\nExplanation :<br \/>\nThe subtrahend 9 is written as 6+ 3 so that the Minuend 16 is subtracted with 6 to get 10. then 3 is subtracted from 10 , we get difference as 7.<\/p>\n<p>Question 10.<br \/>\n___ = 14 &#8211; 7<br \/>\nAnswer :<br \/>\n14 &#8211; 7<br \/>\n14 &#8211; (4 + 3 )<br \/>\n10 &#8211; 3 = 7<br \/>\nSo, 14 &#8211; 7 = 7<br \/>\nExplanation :<br \/>\nThe subtrahend 7 is written as 4+ 3 so that the Minuend 14 is subtracted with 4 to get 10. then 3 is subtracted from 10 , we get difference as 7.<\/p>\n<p>Question 11.<br \/>\n__ = 12 &#8211; 4<br \/>\nAnswer :<br \/>\n12 &#8211; 4<br \/>\n12 &#8211; (2 + 2 )<br \/>\n10 &#8211; 2 = 8<br \/>\nSo, 12 &#8211; 4 = 8<br \/>\nExplanation :<br \/>\nThe subtrahend 4 is written as 2+ 2 so that the Minuend 12 is subtracted with 2 to get 10. then 2 is subtracted from 10 , we get difference as 8.<\/p>\n<p>Question 12.<br \/>\n___ = 18 &#8211; 9<br \/>\nAnswer :<br \/>\n18 &#8211; 9<br \/>\n18 &#8211; (8 + 1 )<br \/>\n10 &#8211; 1 = 9<br \/>\nSo, 18 &#8211; 9 = 9<br \/>\nExplanation :<br \/>\nThe subtrahend 9 is written as 8+ 1 so that the Minuend 18 is subtracted with 8 to get 10. then 1 is subtracted from 10 , we get difference as 9.<\/p>\n<p>Question 13.<br \/>\n<strong>Number Sense<\/strong><br \/>\nComplete each equation.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18631\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-142.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 142\" width=\"583\" height=\"83\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-142.png 583w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-142-300x43.png 300w\" sizes=\"(max-width: 583px) 100vw, 583px\" \/><br \/>\nAnswer :<br \/>\n14 &#8211; 8 = 10 &#8211; 6<br \/>\n13 &#8211; 6 = 10 &#8211; 3<br \/>\n15 &#8211; 7 = 10 &#8211; 2<\/p>\n<p>Question 14.<br \/>\n<strong>Modeling Real Life<\/strong><br \/>\nDescartes has 18 items to sell at a garage sale. He sells 9 of them. How many items does he have left?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18632\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-143.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 143\" width=\"202\" height=\"46\" \/><br \/>\nAnswer :<br \/>\nNumber items with Descartes = 18<br \/>\nNumber of items sold = 9<br \/>\nNumber of items left for sale = 18 &#8211; 9 = 9<\/p>\n<p>Question 15.<br \/>\n<strong>DIG DEEPER!<\/strong><br \/>\nThere are 12 penguins. 5 of them leave to \ufb01nd food at 5:00. 3 more leave at 5:30. How many penguins are left?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18633\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-144.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 144\" width=\"355\" height=\"138\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-144.png 355w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-144-300x117.png 300w\" sizes=\"(max-width: 355px) 100vw, 355px\" \/><br \/>\nAnswer :<br \/>\nNumber of Penguins = 12<br \/>\nNumber of penguins left at 5 : 00 = 5<br \/>\nNumber of penguins left at 5 : 30 = 3<br \/>\nRemaining Number of penguins = 12 &#8211; 5 &#8211; 3 = 4<\/p>\n<p><strong>Review &amp; Refresh<\/strong><\/p>\n<p>Question 16.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18634\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-145.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 145\" width=\"188\" height=\"79\" \/><br \/>\nAnswer :<br \/>\n19 is a Odd Number .<br \/>\nExplanation :<br \/>\nAn\u00a0odd number\u00a0is a\u00a0number\u00a0that cannot be divided into two equal groups.<\/p>\n<p>Question 17.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18635\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-146.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 146\" width=\"185\" height=\"75\" \/><br \/>\nAnswer :<br \/>\n12 is a Even number .<br \/>\nExplanation :<br \/>\nAn\u00a0even number\u00a0is a\u00a0number that can be divided into two equal groups. \u00a0Even numbers end in 2, 4, 6, 8 and 0 regardless of how many digits they have.<\/p>\n<h3><a id=\"Lesson_2.8_Practice_Addition_and_Subtraction\"><\/a>Lesson 2.8 Practice Addition and Subtraction<\/h3>\n<p><strong>Explore and Grow<\/strong><\/p>\n<p>You have 6 yellow buttons and 8 red buttons. Write four equations that describe your buttons.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18636\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-147.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 147\" width=\"293\" height=\"282\" \/><br \/>\nAnswer :<br \/>\nNumber of Yellow buttons = 6<br \/>\nNumber of Red buttons = 8<br \/>\nTotal Number of buttons = 6 + 8 = 8 + 6 = 14<\/p>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-50015\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.8-Practice-Addition-Subtraction-Explore-Grow.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.8-Practice-Addition-Subtraction-Explore-Grow\" width=\"293\" height=\"282\" \/><\/p>\n<p><strong>Show and Grow<\/strong><\/p>\n<p>Question 1.<br \/>\n3 + 9 = ___<br \/>\nAnswer :<br \/>\n3 + 9 = 12<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50886\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.8-Practice-Addition-Subtraction-Question-1.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.8-Practice-Addition-Subtraction-Question-1\" width=\"339\" height=\"231\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.8-Practice-Addition-Subtraction-Question-1.jpg 339w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.8-Practice-Addition-Subtraction-Question-1-300x204.jpg 300w\" sizes=\"(max-width: 339px) 100vw, 339px\" \/><\/p>\n<p>Question 2.<br \/>\n8 &#8211; 6 = ___<br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50016\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.8-Practice-Addition-Subtraction-Show-Grow-Question-2.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.8-Practice-Addition-Subtraction-Show-Grow-Question-2\" width=\"224\" height=\"181\" \/><br \/>\n2 + 6 = 8<br \/>\nSo, 8 &#8211; 6 = 2<\/p>\n<p>Question 3.<br \/>\n11 &#8211; 4 = ___<br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50017\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.8-Practice-Addition-Subtraction-Show-Grow-Question-3.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.8-Practice-Addition-Subtraction-Show-Grow-Question-3\" width=\"224\" height=\"181\" \/><br \/>\n7 + 4 = 11<br \/>\nSo, 11 &#8211; 4 = 7<\/p>\n<p>Question 4.<br \/>\n7 + 7 = __<br \/>\nAnswer :<br \/>\n7 + 7 = 14<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50894\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.8-Practice-Addition-Subtraction-Question-4.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.8-Practice-Addition-Subtraction-Question-4\" width=\"339\" height=\"231\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.8-Practice-Addition-Subtraction-Question-4.jpg 339w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.8-Practice-Addition-Subtraction-Question-4-300x204.jpg 300w\" sizes=\"(max-width: 339px) 100vw, 339px\" \/><\/p>\n<p>Question 5.<br \/>\n9 + 8 = ___<br \/>\nAnswer :<br \/>\n9 + 8 = 17<br \/>\n8 + 8 = 16<br \/>\nExplanation :<br \/>\n9 + 8 is one more than 8 + 8 or 9 + 8<br \/>\nSo, 9 + 8 = 17<\/p>\n<p>Question 6.<br \/>\n10 &#8211; 7 = __<br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50018\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.8-Practice-Addition-Subtraction-Show-Grow-Question-6.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.8-Practice-Addition-Subtraction-Show-Grow-Question-6\" width=\"224\" height=\"181\" \/><br \/>\n3 + 7 = 10<br \/>\nSo, 10 &#8211; 7 = 3<\/p>\n<p><strong>Apply and Grow: Practice<\/strong><\/p>\n<p>Question 7.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18637\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-148.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 148\" width=\"98\" height=\"122\" \/><br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50019\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.8-Practice-Addition-Subtraction-Apply-Grow-Practice-Question-7.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.8-Practice-Addition-Subtraction-Apply-Grow-Practice-Question-7\" width=\"101\" height=\"149\" \/><br \/>\nExplanation :<br \/>\nAny number added to 0 gives the number itself.<\/p>\n<p>Question 8.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18638\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-149.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 149\" width=\"99\" height=\"121\" \/><br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50020\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.8-Practice-Addition-Subtraction-Apply-Grow-Practice-Question-8.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.8-Practice-Addition-Subtraction-Apply-Grow-Practice-Question-8\" width=\"101\" height=\"149\" \/><\/p>\n<p>Question 9.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18639\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-150.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 150\" width=\"93\" height=\"122\" \/><br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50021\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.8-Practice-Addition-Subtraction-Apply-Grow-Practice-Question-9.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.8-Practice-Addition-Subtraction-Apply-Grow-Practice-Question-9\" width=\"97\" height=\"131\" \/><\/p>\n<p>Question 10.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18640\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-151.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 151\" width=\"93\" height=\"128\" \/><br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50022\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.8-Practice-Addition-Subtraction-Apply-Grow-Practice-Question-10.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.8-Practice-Addition-Subtraction-Apply-Grow-Practice-Question-10\" width=\"97\" height=\"131\" \/><\/p>\n<p>Question 11.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18641\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-152.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 152\" width=\"98\" height=\"124\" \/><br \/>\nA<span style=\"font-size: 16px;\">nswer :\u00a0<\/span><\/p>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-50023\" style=\"font-weight: inherit;\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.8-Practice-Addition-Subtraction-Apply-Grow-Practice-Question-11.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.8-Practice-Addition-Subtraction-Apply-Grow-Practice-Question-11\" width=\"98\" height=\"131\" \/><\/p>\n<p>Question 12.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18642\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-153.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 153\" width=\"97\" height=\"124\" \/><br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50024\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.8-Practice-Addition-Subtraction-Apply-Grow-Practice-Question-12.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.8-Practice-Addition-Subtraction-Apply-Grow-Practice-Question-12\" width=\"97\" height=\"131\" \/><br \/>\nExplanation :<br \/>\nAny number added to 0 gives the number itself.<\/p>\n<p>Question 13.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18643\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-154.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 154\" width=\"98\" height=\"123\" \/><br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50025\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.8-Practice-Addition-Subtraction-Apply-Grow-Practice-Question-13.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.8-Practice-Addition-Subtraction-Apply-Grow-Practice-Question-13\" width=\"98\" height=\"131\" \/><\/p>\n<p>Question 14.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18644\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-155.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 155\" width=\"96\" height=\"121\" \/><\/p>\n<p>Answer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50026\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.8-Practice-Addition-Subtraction-Apply-Grow-Practice-Question-14.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.8-Practice-Addition-Subtraction-Apply-Grow-Practice-Question-14\" width=\"97\" height=\"131\" \/><\/p>\n<p>Question 15.<br \/>\n__ = 9 + 1<br \/>\nAnswer :<br \/>\n10 = 9 + 1<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50887\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.8-Practice-Addition-Subtraction-Question-15.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.8-Practice-Addition-Subtraction-Question-15\" width=\"339\" height=\"231\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.8-Practice-Addition-Subtraction-Question-15.jpg 339w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.8-Practice-Addition-Subtraction-Question-15-300x204.jpg 300w\" sizes=\"(max-width: 339px) 100vw, 339px\" \/><\/p>\n<p>Question 16.<br \/>\n__ = 4 + 5<br \/>\nAnswer :<br \/>\n9 = 4 + 5<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50888\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.8-Practice-Addition-Subtraction-Question-16.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.8-Practice-Addition-Subtraction-Question-16\" width=\"339\" height=\"231\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.8-Practice-Addition-Subtraction-Question-16.jpg 339w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.8-Practice-Addition-Subtraction-Question-16-300x204.jpg 300w\" sizes=\"(max-width: 339px) 100vw, 339px\" \/><\/p>\n<p>Question 17.<br \/>\n___ = 11 &#8211; 8<br \/>\nAnswer :<br \/>\n3 = 11 &#8211; 8<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50890\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.8-Practice-Addition-Subtraction-Question-17.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.8-Practice-Addition-Subtraction-Question-17\" width=\"339\" height=\"231\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.8-Practice-Addition-Subtraction-Question-17.jpg 339w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.8-Practice-Addition-Subtraction-Question-17-300x204.jpg 300w\" sizes=\"(max-width: 339px) 100vw, 339px\" \/><br \/>\n3 + 8 = 11<br \/>\nSo, 11 &#8211; 8 = 3<\/p>\n<p>Question 18.<br \/>\n___ = 9 &#8211; 5<br \/>\nAnswer :<br \/>\n4 = 9 &#8211; 5<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50888\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.8-Practice-Addition-Subtraction-Question-16.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.8-Practice-Addition-Subtraction-Question-16\" width=\"339\" height=\"231\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.8-Practice-Addition-Subtraction-Question-16.jpg 339w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.8-Practice-Addition-Subtraction-Question-16-300x204.jpg 300w\" sizes=\"(max-width: 339px) 100vw, 339px\" \/><br \/>\n4 + 5 = 9<br \/>\nSo, 9 &#8211; 5 = 4<\/p>\n<p>Question 19.<br \/>\n__ = 7 + 9<br \/>\nAnswer :<br \/>\n16 = 7 + 9<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50889\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.8-Practice-Addition-Subtraction-Question-19.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.8-Practice-Addition-Subtraction-Question-19\" width=\"339\" height=\"231\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.8-Practice-Addition-Subtraction-Question-19.jpg 339w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.8-Practice-Addition-Subtraction-Question-19-300x204.jpg 300w\" sizes=\"(max-width: 339px) 100vw, 339px\" \/><\/p>\n<p>Question 20.<br \/>\n___ = 7 &#8211; 1<br \/>\nAnswer :<br \/>\n6 = 7 &#8211; 1<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50891\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.8-Practice-Addition-Subtraction-Question-20.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.8-Practice-Addition-Subtraction-Question-20\" width=\"339\" height=\"231\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.8-Practice-Addition-Subtraction-Question-20.jpg 339w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.8-Practice-Addition-Subtraction-Question-20-300x204.jpg 300w\" sizes=\"(max-width: 339px) 100vw, 339px\" \/><br \/>\n1 + 6 = 7<br \/>\nSo, 7 &#8211; 1 = 6<\/p>\n<p>Question 21.<br \/>\n___ = 8 + 4<br \/>\nAnswer :<br \/>\n12 = 8 + 4<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50892\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.8-Practice-Addition-Subtraction-Question-21.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.8-Practice-Addition-Subtraction-Question-21\" width=\"339\" height=\"231\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.8-Practice-Addition-Subtraction-Question-21.jpg 339w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.8-Practice-Addition-Subtraction-Question-21-300x204.jpg 300w\" sizes=\"(max-width: 339px) 100vw, 339px\" \/><\/p>\n<p>Question 22.<br \/>\n__ = 14 &#8211; 7<br \/>\nAnswer :<br \/>\n7 = 14 &#8211; 7<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50893\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.8-Practice-Addition-Subtraction-Question-22.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.8-Practice-Addition-Subtraction-Question-22\" width=\"339\" height=\"231\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.8-Practice-Addition-Subtraction-Question-22.jpg 339w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.8-Practice-Addition-Subtraction-Question-22-300x204.jpg 300w\" sizes=\"(max-width: 339px) 100vw, 339px\" \/><\/p>\n<p>Question 23.<br \/>\n<strong>Repeated Reasoning<\/strong><br \/>\nFind the missing addend. Explain how you solved.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18645\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-156.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 156\" width=\"547\" height=\"159\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-156.png 547w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-156-300x87.png 300w\" sizes=\"(max-width: 547px) 100vw, 547px\" \/><br \/>\nAnswer :<br \/>\n8 + _____ = 13<br \/>\n8 + 5 = 13<br \/>\nExplanation :<br \/>\nTo get 13 what should be added to 8<br \/>\nif we add 5 to 8 we get sum 13 .<\/p>\n<p><strong>Think and Grow: Modeling Real Life<\/strong><\/p>\n<p><strong>Show and Grow<\/strong><\/p>\n<p>How many more students have brown hair than blonde hair?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18647\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-157.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 157\" width=\"272\" height=\"237\" \/><br \/>\nAnswer :<br \/>\nNumber of students with brown hair = 14<br \/>\nNumber of students with black hair = 9<br \/>\nNumber of students with blonde hair = 7<br \/>\nNumber of more students have brown hair than blonde hair = 14 &#8211; 7 = 7<br \/>\nEquation: 14 &#8211; 7 = 7<br \/>\nTherefore 7 students more students have brown hair than blonde hair<\/p>\n<p>How many students do not have brown hair?<br \/>\nEquation: 9 + 7<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18648\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-158.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 158\" width=\"279\" height=\"42\" \/><br \/>\nAnswer :<br \/>\nNumber of students with out brown hair = ( number of students with blonde and black hair ) = 9 + 7 = 16<\/p>\n<p>Question 24.<br \/>\nHow many fewer students have hazel eyes than brown eyes?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18649\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-159.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 159\" width=\"283\" height=\"231\" \/><br \/>\nAnswer :<br \/>\nNumber of students with Blue Color= 8<br \/>\nNumber of students with Brown color = 12<br \/>\nNumber of students with Hazel Color = 4<br \/>\nNumber of students fewer have hazel eyes than brown eyes = 12 &#8211; 4 = 8<\/p>\n<p><strong>DIG DEEPER!<\/strong><br \/>\nHow many students do not have brown eyes?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18650\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-160.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 160\" width=\"374\" height=\"46\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-160.png 374w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-160-300x37.png 300w\" sizes=\"(max-width: 374px) 100vw, 374px\" \/><br \/>\nAnswer :<br \/>\nNumber of students do not have brown eyes = students with blue color and Hazel color = 8 + 4 = 12<\/p>\n<h3><a id=\"Practice_Addition_and_Subtraction_Homework_&amp;_Practice_2.8\"><\/a>Practice Addition and Subtraction Homework &amp; Practice 2.8<\/h3>\n<p>Question 1.<br \/>\n3 + 5 = ___<br \/>\nAnswer :<br \/>\n3 + 5 = 8<\/p>\n<p>Question 2.<br \/>\n5 + 7 = ___<br \/>\nAnswer :<br \/>\n5 + 7<br \/>\n2 + 3 + 7<br \/>\n= 2 + 10 = 12<\/p>\n<p>Explanation :<br \/>\nTo make addend 7 as 10 we should add 3 to the 7 so write addend 5 as\u00a0 2 + 3 .<br \/>\nthen add 3 + 7 we get , 10 and then later add 2 to 10 we get sum , 12 .<\/p>\n<p>Question 3.<br \/>\n13 &#8211; 6 = ___<br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50260\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Practice-Addition-Subtraction-Homework-Practice-2.8-Question-3.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Practice-Addition-Subtraction-Homework-Practice-2.8-Question-3\" width=\"236\" height=\"221\" \/><br \/>\nExplanation :<br \/>\nThe subtrahend 6 is written as 3+ 3 so that the Minuend 13 is subtracted with 3 to get 10. then 3 is subtracted from 10 , we get difference as 7.<\/p>\n<p>Question 4.<br \/>\n12 &#8211; 8 = ___<br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50262\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Practice-Addition-Subtraction-Homework-Practice-2.8-Question-4.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Practice-Addition-Subtraction-Homework-Practice-2.8-Question-4\" width=\"236\" height=\"221\" \/><br \/>\nExplanation :<br \/>\nThe subtrahend 8 is written as 2+ 6 so that the Minuend 12 is subtracted with 2 to get 10. then 6 is subtracted from 10 , we get difference as 4.<\/p>\n<p>Question 5.<br \/>\n6 + 0 = __<br \/>\nAnswer :<br \/>\n6 + 0 = 6<br \/>\nExplanation :<br \/>\nAny number added to 0 gives the sum the number itself .<\/p>\n<p>Question 6.<br \/>\n15 &#8211; 8 = ___<br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50263\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Practice-Addition-Subtraction-Homework-Practice-2.8-Question-6.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Practice-Addition-Subtraction-Homework-Practice-2.8-Question-6\" width=\"258\" height=\"248\" \/><br \/>\nExplanation :<br \/>\nThe subtrahend 8 is written as 5+ 3 so that the Minuend 15 is subtracted with 5 to get 10. then 3 is subtracted from 10 , we get difference as 7.<\/p>\n<p>Question 7.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18651\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-161.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 161\" width=\"96\" height=\"122\" \/><br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50264\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Practice-Addition-Subtraction-Homework-Practice-2.8-Question-7.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Practice-Addition-Subtraction-Homework-Practice-2.8-Question-7\" width=\"95\" height=\"140\" \/><\/p>\n<p>Question 8.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18652\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-162.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 162\" width=\"101\" height=\"122\" \/><br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50265\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Practice-Addition-Subtraction-Homework-Practice-2.8-Question-8.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Practice-Addition-Subtraction-Homework-Practice-2.8-Question-8\" width=\"111\" height=\"151\" \/><\/p>\n<p>Question 9.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18653\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-163.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 163\" width=\"105\" height=\"124\" \/><br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50266\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Practice-Addition-Subtraction-Homework-Practice-2.8-Question-9.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Practice-Addition-Subtraction-Homework-Practice-2.8-Question-9\" width=\"108\" height=\"140\" \/><\/p>\n<p>Question 10.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18654\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-164.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 164\" width=\"93\" height=\"127\" \/><br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50267\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Practice-Addition-Subtraction-Homework-Practice-2.8-Question-10.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Practice-Addition-Subtraction-Homework-Practice-2.8-Question-10\" width=\"108\" height=\"140\" \/><br \/>\nExplanation :<br \/>\nAny number subtracted with 1 gives the difference of previous number .<\/p>\n<p>Question 11.<br \/>\n___ = 5 + 5<br \/>\nAnswer :<br \/>\n5 + 5 = 10<\/p>\n<p>Question 12.<br \/>\n___ = 3 &#8211; 0<br \/>\nAnswer :<br \/>\n3 &#8211; 0 = 3<br \/>\nExplanation :<br \/>\nAny number subtracted with 0 gives the difference the number itself .<\/p>\n<p>Question 13.<br \/>\n<strong>Number Sense<\/strong><br \/>\nWhich expressions have a sum or difference that is greater than 10?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18655\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-165.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 165\" width=\"388\" height=\"117\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-165.png 388w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-165-300x90.png 300w\" sizes=\"(max-width: 388px) 100vw, 388px\" \/><\/p>\n<p>Question 14.<br \/>\n<strong>Modeling Real Life<\/strong><br \/>\nHow many fewer students choose a sandwich than pizza?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18656\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-166.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 166\" width=\"328\" height=\"233\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-166.png 328w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-166-300x213.png 300w\" sizes=\"(max-width: 328px) 100vw, 328px\" \/><br \/>\nAnswer :<br \/>\nNumber of students chooses sandwich = 9<br \/>\nNumber of students chooses pasta = 4<br \/>\nNumber of students chooses pizza = 15<br \/>\nNumber of fewer students chooses a sandwich than pizza = 15 &#8211; 9 = 4<br \/>\nTherefore 4 fewer students chooses a sandwich than pizza .<\/p>\n<p><strong>DIG DEEPER!<\/strong><br \/>\nHow many students do not choose pizza?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18657\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-167.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 167\" width=\"337\" height=\"59\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-167.png 337w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-167-300x53.png 300w\" sizes=\"(max-width: 337px) 100vw, 337px\" \/><\/p>\n<p>Answer :<br \/>\nNumber of students do not choose pizza = number of students who chooses sandwich and pasta<br \/>\n= 9 + 4 = 13<br \/>\nTherefore, Number of students do not choose pizza = 13<\/p>\n<p>Question 15.<br \/>\nCircle groups of 4. Write a repeated addition equation to match.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18658\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-168.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 168\" width=\"606\" height=\"145\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-168.png 606w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-168-300x72.png 300w\" sizes=\"(max-width: 606px) 100vw, 606px\" \/><br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50270\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Practice-Addition-Subtraction-Homework-Practice-2.8-Question-15-1.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Practice-Addition-Subtraction-Homework-Practice-2.8-Question-15\" width=\"713\" height=\"246\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Practice-Addition-Subtraction-Homework-Practice-2.8-Question-15-1.jpg 713w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Practice-Addition-Subtraction-Homework-Practice-2.8-Question-15-1-300x104.jpg 300w\" sizes=\"(max-width: 713px) 100vw, 713px\" \/><br \/>\nExplanation :<br \/>\nNumber of birds = 16<br \/>\nNumber of groups = 4<br \/>\nNumber of birds in each group = 16 \u00f7 4 = 4<br \/>\nTherefore, 4 + 4 + 4 + 4 = 16 each group contains 4 birds .<\/p>\n<h3><a id=\"Lesson_2.9_Problem_Solving:_Addition_and_Subtraction\"><\/a>Lesson 2.9 Problem Solving: Addition and Subtraction<\/h3>\n<p><strong>Explore and Grow<\/strong><\/p>\n<p>Model the story.<\/p>\n<p>You have 5 puzzle pieces. Your friend has 9. How many more pieces does your friend have than you?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18659\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-169.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 169\" width=\"287\" height=\"85\" \/><br \/>\nAnswer :<br \/>\nNumber of puzzles with me = 5<br \/>\nNumber of puzzles with my friend = 9<br \/>\nNumber of more pieces does my friend have than me = 9 &#8211; 5 = 4<\/p>\n<p><strong>Show and Grow<\/strong><\/p>\n<p>Question 1.<br \/>\nYou have 7 more keychains than your friend. You have 15 keychains. How many keychains does your friend have?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18660\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-170.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 170\" width=\"627\" height=\"236\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-170.png 627w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-170-300x113.png 300w\" sizes=\"(max-width: 627px) 100vw, 627px\" \/><br \/>\nAnswer :<br \/>\nNumber of key chains with me = 15<br \/>\nNumber of key chains with my friend = You have 7 more keychains than your friend = 15 -7 = 8<br \/>\nExplanation :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50271\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.9-Problem-Solving-Addition-Subtraction-Show-Grow-Question-1.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.9-Problem-Solving-Addition-Subtraction-Show-Grow-Question-1\" width=\"713\" height=\"246\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.9-Problem-Solving-Addition-Subtraction-Show-Grow-Question-1.jpg 713w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Lesson-2.9-Problem-Solving-Addition-Subtraction-Show-Grow-Question-1-300x104.jpg 300w\" sizes=\"(max-width: 713px) 100vw, 713px\" \/><\/p>\n<p><strong>Apply and Grow: Practice<\/strong><\/p>\n<p>Question 2.<br \/>\nSome friends are at a community pool. 7 more join them. Now there are 12. How many friends were there to start?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18661\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-172.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 172\" width=\"157\" height=\"172\" \/><br \/>\nAnswer :<br \/>\nNumber of friends at community pool = x<br \/>\nNumber of friends joined\u00a0 = 7<br \/>\nNumber of friends now at pool = 15 = x + 7<br \/>\nx + 7 = 15<br \/>\nx = 15 &#8211; 7 = 8<br \/>\nTherefore, Number of friends at community pool = 8<\/p>\n<p>Question 3.<br \/>\nSome friends are playing miniature golf. 8 of them leave. There are 6 left. How many friends were there to start?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18662\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-173.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 173\" width=\"170\" height=\"197\" \/><br \/>\nAnswer :<br \/>\nNumber of friends playing golf = x<br \/>\nNumber of friends left = 8<br \/>\nNumber of friends now playing golf = 6<br \/>\nNumber of friends at the start = x- 8 = 6<br \/>\nx= 8+ 6 = 14<br \/>\nTherefore, 14 friends were there to start.<\/p>\n<p>Question 4.<br \/>\n<strong>YOU BE THE TEACHER<\/strong><br \/>\nNewton has 5 fewer \ufb01sh than Descartes. Newton has 8 \ufb01sh. Your friend uses a bar model to \ufb01nd how many \ufb01sh Descartes has. Is your friend correct? Explain.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18664\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-174.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 174\" width=\"101\" height=\"91\" \/><br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18663\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-174.1.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 174.1\" width=\"629\" height=\"212\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-174.1.png 629w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-174.1-300x101.png 300w\" sizes=\"(max-width: 629px) 100vw, 629px\" \/><br \/>\nAnswer :<br \/>\nYes he is correct<br \/>\nExplanation :<br \/>\nNumber of fishes with Newton = 8<br \/>\nNumber of fishes with Descartes = Newton has 5 fewer \ufb01sh than Descartes. that means Descartes 5 more fishes than Newton = 8 + 5 = 13<\/p>\n<p><strong>Think and Grow: Modeling Real Life<\/strong><\/p>\n<p>15 kids play at a park. 6 of them leave. 9 more kids come to the park. How many kids are at the park now?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18665\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-175.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 175\" width=\"174\" height=\"132\" \/><br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18666\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-176.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 176\" width=\"555\" height=\"178\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-176.png 555w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-176-300x96.png 300w\" sizes=\"(max-width: 555px) 100vw, 555px\" \/><br \/>\nAnswer :<br \/>\nNumber of kids playing in the park = 15<br \/>\nNumber of kids left the park = 6<br \/>\nNumber of kids remaining in the park = 15 &#8211; 6 = 9<br \/>\nNumber of kids joined the park = 9<br \/>\nTotal number kids now in the park = 9 + 9 = 18<\/p>\n<p>Question 5.<br \/>\nYou have 13 baseball cards. You give 5 away. Then you get 4 more. How many baseball cards do you have now?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18646\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-157.1.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 157.1\" width=\"231\" height=\"172\" \/><br \/>\nAnswer :<br \/>\nNumber of base balls cards with me = 13<br \/>\nNumber of base balls cards given away = 5<br \/>\nNumber of base balls cards remaining with me now = 13 &#8211; 5 = 8<br \/>\nNumber of base balls cards added = 4<br \/>\nTotal Number of base balls cards now = 8 + 4 = 12<\/p>\n<p>Question 6.<br \/>\n<strong>DIG DEEPER!<\/strong><br \/>\nThere are 7 adult lions and some cubs in a pride. The pride has 13 lions in all. 3 more cubs are born. How many cubs are in the pride now?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18667\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-178.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 178\" width=\"273\" height=\"46\" \/><br \/>\nExplain how you solved this problem.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18668\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-179.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 179\" width=\"568\" height=\"93\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-179.png 568w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-179-300x49.png 300w\" sizes=\"(max-width: 568px) 100vw, 568px\" \/><br \/>\nAnswer :<br \/>\nNumber of Adults lions = 7<br \/>\nNumber of Lions = 13<br \/>\nNumber of cubs are more than 3<br \/>\nNumber of cubs = 13 &#8211; 7 = 6<br \/>\nTherefore, Number of cubs in the pride = 6<\/p>\n<h3><a id=\"Problem_Solving:_Addition_and_Subtraction_Homework_&amp;_Practice_2.9\"><\/a>Problem Solving: Addition and Subtraction Homework &amp; Practice 2.9<\/h3>\n<p>Question 1.<br \/>\nYou have 3 more movies than your friend. You have 10 movies. Your friend has 5 video games. How many movies does your friend have?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18669\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-180.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 180\" width=\"97\" height=\"91\" \/><br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18670\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-181.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 181\" width=\"608\" height=\"131\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-181.png 608w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-181-300x65.png 300w\" sizes=\"(max-width: 608px) 100vw, 608px\" \/><br \/>\nAnswer :<br \/>\nNumber of movies with me = 10<br \/>\nYou have 3 more movies than your friend<br \/>\nNumber of movies with my friend = 10 &#8211; 3 = 7<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50291\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Problem-Solving-Addition-Subtraction-Homework-Practice-2.9-Question-1.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Problem-Solving-Addition-Subtraction-Homework-Practice-2.9-Question-1\" width=\"695\" height=\"192\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Problem-Solving-Addition-Subtraction-Homework-Practice-2.9-Question-1.jpg 695w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Problem-Solving-Addition-Subtraction-Homework-Practice-2.9-Question-1-300x83.jpg 300w\" sizes=\"(max-width: 695px) 100vw, 695px\" \/><\/p>\n<p>Question 2.<br \/>\nSome friends are at a skating rink. 6 more join them. Now there are 11. How many friends were there to start?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18671\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-182.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 182\" width=\"146\" height=\"107\" \/><br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18672\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-183.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 183\" width=\"253\" height=\"52\" \/><br \/>\nAnswer :<br \/>\nNumber of Friends at skating rink = x<br \/>\nNumber of friends joined = 6<br \/>\nNumber of Friends now at skating rink = 11<br \/>\nNumber of Friends at skating rink = 11 &#8211; 6 = 5<br \/>\nTherefore, 5 friends were there to start<\/p>\n<p>Question 3.<br \/>\n<strong>Structure<\/strong><br \/>\nThere are 9 bananas in a bunch. A monkey eats some. There are 5 bananas left. Which picture shows how many bananas the monkey ate?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18673\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-184.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 184\" width=\"598\" height=\"125\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-184.png 598w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-184-300x63.png 300w\" sizes=\"(max-width: 598px) 100vw, 598px\" \/><br \/>\nAnswer :<br \/>\nNumber of Bananas = 9<br \/>\nNumber of Bananas left = 5<br \/>\nNumber of Bananas eaten by Monkey = 9 &#8211; 5 = 4<br \/>\nPicture 4 shows 4 Bananas .<\/p>\n<p>Question 4.<br \/>\n<strong>Modeling Real Life<\/strong><br \/>\nYou make 4 snow angels and Newton makes 5. Descartes makes 3 more snow angels. How many snow angels are there in all?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18674\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-185.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 185\" width=\"209\" height=\"208\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-185.png 209w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-185-150x150.png 150w\" sizes=\"(max-width: 209px) 100vw, 209px\" \/><br \/>\nAnswer :<br \/>\nNumber of snow angels made by me = 4<br \/>\nNumber of Snow angels made by Newton = 5<br \/>\nNumber of Snow angels made by Descartes = 3<br \/>\nTotal Number of Snow angels = 4 + 5 + 3 = 12<\/p>\n<p>Question 5.<br \/>\n<strong>Modeling Real Life<\/strong><br \/>\nNewton has 9 glitter pens. Descartes has 2 fewer than Newton. How many glitter pens do they have in all?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18676\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-186.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 186\" width=\"194\" height=\"191\" \/><br \/>\nAnswer :<br \/>\nNumber of Glitter pens with Newton= 9<br \/>\nNumber of Glitter pens with Descartes = Descartes has 2 fewer than Newton = 9 &#8211; 2 = 7<br \/>\nNumber of Glitter pens in all = 9 + 7 = 16<\/p>\n<p><strong>Review &amp; Refresh<\/strong><\/p>\n<p>Question 6.<br \/>\nWhich two shapes combine to make the shape on the left?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18675\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-186.1.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 186.1\" width=\"440\" height=\"72\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-186.1.png 440w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-186.1-300x49.png 300w\" sizes=\"(max-width: 440px) 100vw, 440px\" \/><br \/>\nAnswer :<br \/>\nTriangle and semi-circle combine to make the above shape .<\/p>\n<h3><a id=\"Fluency_and_Strategies_within_20_Activity\"><\/a>Fluency and Strategies within 20 Performance Task<\/h3>\n<p>Question 1.<br \/>\nYou and your friend check out books from the library as shown in the table.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18677\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-187.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 187\" width=\"432\" height=\"172\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-187.png 432w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-187-300x119.png 300w\" sizes=\"(max-width: 432px) 100vw, 432px\" \/><br \/>\na. You have one more adventure book than science books. How many books do you have in all?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18678\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-188.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 188\" width=\"381\" height=\"47\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-188.png 381w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-188-300x37.png 300w\" sizes=\"(max-width: 381px) 100vw, 381px\" \/><br \/>\nAnswer :<br \/>\nNumber of History books with me = 5<br \/>\nNumber of science books with me = 7<br \/>\nNumber of Adventure books with me = one more adventure books than science books = 7 + 1 = 8<br \/>\nTotal Number of Books with me N= science + History + Adventure = 7 + 5 + 8 = 20<\/p>\n<p>b. You and your friend have the same number of books. Your friend has more science books than history books. Your friend has an even number of adventure books. How many science books and adventure books does your friend have?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18679\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-189.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 189\" width=\"563\" height=\"46\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-189.png 563w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-189-300x25.png 300w\" sizes=\"(max-width: 563px) 100vw, 563px\" \/><br \/>\nAnswer :<br \/>\nTotal Number of books with me = Total Number of books with my friend = 20<br \/>\nScience books &gt; History books<br \/>\nNumber of history books with my Friend = 8<br \/>\nNumber of Science books with my friend let it be = 10<br \/>\nNumber of books remaining = 20 &#8211; 8 &#8211; 10 = 2<br \/>\nNumber of Adventure books = 2 even number<br \/>\nSo, all the given conditions are satisfied .<\/p>\n<p>c. How many books do you and your friend have in all that are not history books?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18680\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-190.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 190\" width=\"162\" height=\"117\" \/><br \/>\nAnswer :<br \/>\nNumber of History books with me and my friend = 5 + 8 = 13<br \/>\nNumber of Books with me and my friend = 20 + 20 = 40<br \/>\nNumber of books in all that are not history books = 40 &#8211; 13 = 27 Books.<\/p>\n<p>d. You return 3 books on Monday and 6 books on Thursday. How many books do you have left?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18681\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-191.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 191\" width=\"259\" height=\"49\" \/><br \/>\nAnswer :<br \/>\nNumber of books with me = 20<br \/>\nNumber of books returned on Monday = 3<br \/>\nNumber of books returned on Thrusday = 6<br \/>\nNumber of books left now = 20 &#8211; 3 &#8211; 6 = 20 &#8211; 9 = 11 Books.<\/p>\n<h3><a id=\"Fluency_and_Strategies_within_20_Activity\"><\/a>Fluency and Strategies within 20 Activity<\/h3>\n<p><strong>To Play:<\/strong><br \/>\nPlace your cube on 0. Roll a die to see how many spaces to move. Write an equation that matches on the Joey Jump Add or Subtract Recording Sheet. Continue until you reach the food and then return to the pouch.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18682\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-192.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 192\" width=\"534\" height=\"612\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-192.png 534w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-192-262x300.png 262w\" sizes=\"(max-width: 534px) 100vw, 534px\" \/><\/p>\n<h3><a id=\"Fluency_and_Strategies_within_20_Chapter_Practice\"><\/a>Fluency and Strategies within 20 Chapter Practice<\/h3>\n<p><strong>2.1 Add in Any Order<\/strong><\/p>\n<p>Question 1.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18683\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-193.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 193\" width=\"586\" height=\"111\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-193.png 586w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-193-300x57.png 300w\" sizes=\"(max-width: 586px) 100vw, 586px\" \/><br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50292\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.1-Add-in-Any-Order-Question-1.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.1-Add-in-Any-Order-Question-1\" width=\"622\" height=\"187\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.1-Add-in-Any-Order-Question-1.jpg 622w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.1-Add-in-Any-Order-Question-1-300x90.jpg 300w\" sizes=\"(max-width: 622px) 100vw, 622px\" \/><br \/>\nExplanation :<br \/>\nChanging the Order of addends doesn&#8217;t change the sum. The Expressions 7 + 2 and\u00a0 2 + 7 have the sum\u00a0 9 .<\/p>\n<p>Question 2.<br \/>\n<strong>Number Sense<\/strong><br \/>\nComplete each equation.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18685\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-194.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 194\" width=\"656\" height=\"84\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-194.png 656w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-194-300x38.png 300w\" sizes=\"(max-width: 656px) 100vw, 656px\" \/><br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50293\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.1-Add-in-Any-Order-Question-2.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.1-Add-in-Any-Order-Question-2\" width=\"644\" height=\"129\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.1-Add-in-Any-Order-Question-2.jpg 644w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.1-Add-in-Any-Order-Question-2-300x60.jpg 300w\" sizes=\"(max-width: 644px) 100vw, 644px\" \/><br \/>\nExplanation :<br \/>\nChanging the Order of addends doesn&#8217;t change the sum. The Expression a + b = b +a = c ,the sum .<\/p>\n<p><strong>2.2 Use Doubles<\/strong><\/p>\n<p>Find the sum. Write the double you used.<\/p>\n<p>Question 3.<br \/>\n6 + 5 = ___<br \/>\n___ + ___ = ___<br \/>\nAnswer :<br \/>\n6 + 5 = 11<br \/>\n5 + 5 = 10<br \/>\nExplanation :<br \/>\nDoubles plus 1<br \/>\n6 + 5 is equal to 5 + 5 and 1 more.<\/p>\n<p>Question 4.<br \/>\n8 +9 = ___<br \/>\n___ + ___ = ___<br \/>\nAnswer :<br \/>\n8 + 9 = 17<br \/>\n8 + 8 = 16<br \/>\nExplanation :<br \/>\nDoubles plus 1<br \/>\n8 + 9 is equal to 8 + 8 and 1 more.<\/p>\n<p>Question 5.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18686\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-195.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 195\" width=\"224\" height=\"187\" \/><br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50294\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.2-Use-Doubles-Question-5.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.2-Use-Doubles-Question-5\" width=\"245\" height=\"219\" \/><br \/>\nExplanation :<br \/>\nChanging the Order of addends doesn&#8217;t change the sum. The Expressions 3 + 2 and\u00a0 2 + 3 have the sum\u00a0 5 .<\/p>\n<p>Question 6.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18687\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-196.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 196\" width=\"225\" height=\"184\" \/><br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50295\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.2-Use-Doubles-Question-6.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.2-Use-Doubles-Question-6\" width=\"245\" height=\"219\" \/><br \/>\nExplanation :<br \/>\nChanging the Order of addends doesn&#8217;t change the sum. The Expressions 7 + 8 and\u00a0 8 + 7 have the sum\u00a0 15 .<\/p>\n<p><strong>2.3 Add Three Numbers<\/strong><\/p>\n<p>Question 7.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18688\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-197.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 197\" width=\"198\" height=\"65\" \/><br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50296\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.3-Add-Three-Numbers-Question-7.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.3-Add-Three-Numbers-Question-7\" width=\"245\" height=\"243\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.3-Add-Three-Numbers-Question-7.jpg 245w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.3-Add-Three-Numbers-Question-7-150x150.jpg 150w\" sizes=\"(max-width: 245px) 100vw, 245px\" \/><br \/>\nExplanation :<br \/>\nExplanation:<br \/>\nAddends are represented in circle and Sum is represented in square.<br \/>\nFirst adding two addends 8, 0 give the sum 8<br \/>\nand then adding the another addend 6 to the sum 8.<br \/>\nGives the sum 14.<\/p>\n<p>Question 8.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18689\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-198.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 198\" width=\"98\" height=\"152\" \/><br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50298\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.3-Add-Three-Numbers-Question-8-1.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.3-Add-Three-Numbers-Question-8\" width=\"191\" height=\"203\" \/><br \/>\nExplanation:<br \/>\nAddends are represented in circle and Sum is represented in square.<br \/>\nFirst adding two addends 1, 3 give the sum 4<br \/>\nand then adding the another addend 9 to the sum 4.<br \/>\nGives the sum 13.<\/p>\n<p>Question 9.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18690\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-199.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 199\" width=\"198\" height=\"51\" \/><br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50299\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.3-Add-Three-Numbers-Question-9.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.3-Add-Three-Numbers-Question-9\" width=\"205\" height=\"243\" \/><br \/>\nExplanation:<br \/>\nAddends are represented in circle and Sum is represented in square.<br \/>\nFirst adding two addends 8, 8 give the sum 16<br \/>\nand then adding the another addend 4 to the sum 16.<br \/>\nGives the sum 20.<\/p>\n<p>Question 10.<br \/>\n4 + 8 + 8 = ___<br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50299\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.3-Add-Three-Numbers-Question-9.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.3-Add-Three-Numbers-Question-9\" width=\"205\" height=\"243\" \/><br \/>\nExplanation:<br \/>\nAddends are represented in circle and Sum is represented in square.<br \/>\nFirst adding two addends 8, 8 give the sum 16<br \/>\nand then adding the another addend 4 to the sum 16.<br \/>\nGives the sum 20.<\/p>\n<p>Question 10.<br \/>\n<strong>Structure<\/strong><br \/>\nWrite the missing addends.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18691\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-200.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 200\" width=\"602\" height=\"177\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-200.png 602w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-200-300x88.png 300w\" sizes=\"(max-width: 602px) 100vw, 602px\" \/><br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50300\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.3-Add-Three-Numbers-Question-10.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.3-Add-Three-Numbers-Question-10\" width=\"651\" height=\"203\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.3-Add-Three-Numbers-Question-10.jpg 651w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.3-Add-Three-Numbers-Question-10-300x94.jpg 300w\" sizes=\"(max-width: 651px) 100vw, 651px\" \/><\/p>\n<p><strong>2.4 Make a ten to Add<\/strong><\/p>\n<p>Make a 10 to add<\/p>\n<p>Question 11.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18692\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-201.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 201\" width=\"247\" height=\"229\" \/><br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50301\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.4-Make-a-ten-to-Add-Question-11.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.4-Make-a-ten-to-Add-Question-11\" width=\"288\" height=\"313\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.4-Make-a-ten-to-Add-Question-11.jpg 288w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.4-Make-a-ten-to-Add-Question-11-276x300.jpg 276w\" sizes=\"(max-width: 288px) 100vw, 288px\" \/><\/p>\n<p>Explanation :<br \/>\nTo make addend 9 as 10 we should add 1 to the 9 so write addend 8 as\u00a0 1 + 7 .<br \/>\nthen add 9 + 1 we get , 10 and then later add 7 to 10 we get sum , 17 .<\/p>\n<p>Question 12.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18693\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-202.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 202\" width=\"237\" height=\"224\" \/><\/p>\n<p>Answer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50302\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.4-Make-a-ten-to-Add-Question-12.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.4-Make-a-ten-to-Add-Question-12\" width=\"274\" height=\"269\" \/><\/p>\n<p>Explanation :<br \/>\nTo make addend 7 as 10 we should add 3 to the 7 so write addend 6 as\u00a0 3 + 3 .<br \/>\nthen add 7 + 3 we get , 10 and then later add 3 to 10 we get sum , 13 .<\/p>\n<p>Question 13.<br \/>\n9 + 6 = ___<br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50303\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.4-Make-a-ten-to-Add-Question-13.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.4-Make-a-ten-to-Add-Question-13\" width=\"274\" height=\"269\" \/><\/p>\n<p>Explanation :<br \/>\nTo make addend 9 as 10 we should add 1 to the 9 so write addend 6 as\u00a0 1 + 5 .<br \/>\nthen add 9 + 1 we get , 10 and then later add 5 to 10 we get sum , 15 .<\/p>\n<p>Question 14.<br \/>\n4 + 7 = ___<br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50304\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.4-Make-a-ten-to-Add-Question-14.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.4-Make-a-ten-to-Add-Question-14\" width=\"274\" height=\"269\" \/><\/p>\n<p>Explanation :<br \/>\nTo make addend 4 as 10 we should add 6 to the 4 so write addend 7 as\u00a0 6 + 1 .<br \/>\nthen add 4 + 6 we get , 10 and then later add 1 to 10 we get sum , 11 .<\/p>\n<p><strong>2.5 Count On and Count Back to Subtract<\/strong><\/p>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-18694\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-203.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 203\" width=\"534\" height=\"74\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-203.png 534w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-203-300x42.png 300w\" sizes=\"(max-width: 534px) 100vw, 534px\" \/><\/p>\n<p>Question 15.<br \/>\n12 &#8211; 8 = __<br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50314\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.5-Count-On-and-Count-Back-to-Subtract-Question-15-1.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.5-Count-On-and-Count-Back-to-Subtract-Question-15\" width=\"748\" height=\"164\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.5-Count-On-and-Count-Back-to-Subtract-Question-15-1.jpg 748w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.5-Count-On-and-Count-Back-to-Subtract-Question-15-1-300x66.jpg 300w\" sizes=\"(max-width: 748px) 100vw, 748px\" \/><br \/>\nStart at 12 and count back to 8 . The arrow ends at 4 showing the difference . So, 12 &#8211; 8 = 4<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50316\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.5-Count-On-and-Count-Back-to-Subtract-Question-15-b-1.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.5-Count-On-and-Count-Back-to-Subtract-Question-15-b\" width=\"771\" height=\"158\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.5-Count-On-and-Count-Back-to-Subtract-Question-15-b-1.jpg 771w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.5-Count-On-and-Count-Back-to-Subtract-Question-15-b-1-300x61.jpg 300w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.5-Count-On-and-Count-Back-to-Subtract-Question-15-b-1-768x157.jpg 768w\" sizes=\"(max-width: 771px) 100vw, 771px\" \/><br \/>\nStart at 8 count on to 12. So, 12 &#8211; 8 = 4<\/p>\n<p>Question 16.<br \/>\n14 &#8211; 5 = ___<br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50318\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.5-Count-On-and-Count-Back-to-Subtract-Question-16-a-1.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.5-Count-On-and-Count-Back-to-Subtract-Question-16-a\" width=\"730\" height=\"172\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.5-Count-On-and-Count-Back-to-Subtract-Question-16-a-1.jpg 730w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.5-Count-On-and-Count-Back-to-Subtract-Question-16-a-1-300x71.jpg 300w\" sizes=\"(max-width: 730px) 100vw, 730px\" \/><br \/>\nStart at 14 and count back to 5 . The arrow ends at 9 showing the difference . So, 14 &#8211; 5 = 9<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50319\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.5-Count-On-and-Count-Back-to-Subtract-Question-16-b.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.5-Count-On-and-Count-Back-to-Subtract-Question-16-b\" width=\"727\" height=\"164\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.5-Count-On-and-Count-Back-to-Subtract-Question-16-b.jpg 727w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.5-Count-On-and-Count-Back-to-Subtract-Question-16-b-300x68.jpg 300w\" sizes=\"(max-width: 727px) 100vw, 727px\" \/><br \/>\nStart at 5 count on to 14. So, 14 &#8211; 5 = 9<\/p>\n<p>Question 17.<br \/>\n17 &#8211; 9 = ___<br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50321\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.5-Count-On-and-Count-Back-to-Subtract-Question-17-a-1.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.5-Count-On-and-Count-Back-to-Subtract-Question-17-a\" width=\"749\" height=\"172\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.5-Count-On-and-Count-Back-to-Subtract-Question-17-a-1.jpg 749w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.5-Count-On-and-Count-Back-to-Subtract-Question-17-a-1-300x69.jpg 300w\" sizes=\"(max-width: 749px) 100vw, 749px\" \/><br \/>\nStart at 17 and count back to 9 . The arrow ends at 8 showing the difference . So, 17 &#8211; 9 = 8<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50322\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.5-Count-On-and-Count-Back-to-Subtract-Question-17-b.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.5-Count-On-and-Count-Back-to-Subtract-Question-17-b\" width=\"718\" height=\"149\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.5-Count-On-and-Count-Back-to-Subtract-Question-17-b.jpg 718w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.5-Count-On-and-Count-Back-to-Subtract-Question-17-b-300x62.jpg 300w\" sizes=\"(max-width: 718px) 100vw, 718px\" \/><br \/>\nStart at 9 count on to 17. So, 17 &#8211; 9 = 8<\/p>\n<p><strong>2.6 Relate Addition and Subtraction<\/strong><\/p>\n<p>Question 18.<br \/>\n7 + 6 = __<br \/>\n13 &#8211; 6 = ___<br \/>\n13 &#8211; 7 = ___<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18695\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-204.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 204\" width=\"271\" height=\"165\" \/><br \/>\nAnswer :<br \/>\n7 + 6 = 13<br \/>\n13 &#8211; 6 = 7<br \/>\n13 &#8211; 7 = 6<\/p>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-50305\" style=\"font-weight: inherit;\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.6-Relate-Addition-and-Subtraction-Question-18.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.6-Relate-Addition-and-Subtraction-Question-18\" width=\"292\" height=\"188\" \/><br \/>\nE<span style=\"font-size: 16px;\">xplana<\/span><span style=\"font-size: 16px;\">tion :<br \/>\n<\/span>Addition and subtraction\u00a0are\u00a0inverse\u00a0operations because one operation can &#8220;undo&#8221; the other operation.<br \/>\nAdding 7 and 6 to get 13 is the opposite of 13 minus 7, leaving 6 or the opposite of 13 minus 6, leaving 7.<\/p>\n<p><strong>2.7 Get to 10 to Subtract<\/strong><\/p>\n<p>Get to 10 to subtract<\/p>\n<p>Question 19.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18696\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-205.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 205\" width=\"231\" height=\"218\" \/><br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50306\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.7-Get-to-10-to-Subtract-Question-19.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.7-Get-to-10-to-Subtract-Question-19\" width=\"262\" height=\"279\" \/><br \/>\nExplanation :<br \/>\nThe subtrahend 4 is written as 2+ 2 so that the Minuend 12 is subtracted with 2 to get 10. then 2 is subtracted from 10 , we get difference as 8.<\/p>\n<p>Question 20.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18697\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-206.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 206\" width=\"225\" height=\"222\" \/><br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50307\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.7-Get-to-10-to-Subtract-Question-20.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.7-Get-to-10-to-Subtract-Question-20\" width=\"223\" height=\"262\" \/><br \/>\nExplanation :<br \/>\nThe subtrahend 8 is written as 5 + 3 so that the Minuend 15 is subtracted with 5 to get 10. then 3 is subtracted from 10 , we get difference as 7.<\/p>\n<p>Question 21.<br \/>\n16 &#8211; 9 = ___<br \/>\nAnswer :<br \/>\n16 &#8211; 9 =<br \/>\n16 &#8211; ( 6 + 3 )<br \/>\n10 &#8211; 3 = 7<br \/>\nSo, 16 &#8211; 9 = 7<br \/>\nExplanation :<br \/>\nThe subtrahend 9 is written as 6+ 3 so that the Minuend 16 is subtracted with 6 to get 10. then 3 is subtracted from 10 , we get difference as 7.<\/p>\n<p>Question 22.<br \/>\n14 &#8211; 7 = ___<br \/>\nAnswer :<br \/>\n14 &#8211; 7 =<br \/>\n14 &#8211; ( 4 + 3 )<br \/>\n10 &#8211; 3 = 7<br \/>\nSo, 14 &#8211; 7 = 7<br \/>\nExplanation :<br \/>\nThe subtrahend 7 is written as 4 + 3 so that the Minuend 14 is subtracted with 4 to get 10. then 3 is subtracted from 10 , we get difference as 7.<\/p>\n<p><strong>2.8 Practice Addition and Subtraction<\/strong><\/p>\n<p>Question 23.<br \/>\n8 + 3 = ___<br \/>\nAnswer :<br \/>\n8 + 3 = 11<\/p>\n<p>Question 24.<br \/>\n13 &#8211; 7 = ___<br \/>\nAnswer :<br \/>\n12 &#8211; 4 =<br \/>\n12 &#8211; ( 2 + 2 )<br \/>\n10 &#8211; 2 = 8<br \/>\nSo, 12 &#8211; 4 = 8<br \/>\nExplanation :<br \/>\nThe subtrahend 5 is written as 2+ 3 so that the Minuend 12 is subtracted with 2 to get 10. then 3 is subtracted from 10 , we get difference as 7.<\/p>\n<p>Question 25.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18698\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-207.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 207\" width=\"101\" height=\"125\" \/><br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50308\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.8-Practice-Addition-and-Subtraction-Question-25.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.8-Practice-Addition-and-Subtraction-Question-25\" width=\"124\" height=\"170\" \/><\/p>\n<p>Question 26.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18699\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-208.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 208\" width=\"99\" height=\"120\" \/><br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50309\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.8-Practice-Addition-and-Subtraction-Question-26.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.8-Practice-Addition-and-Subtraction-Question-26\" width=\"124\" height=\"170\" \/><\/p>\n<p>Question 27.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18700\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-209.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 209\" width=\"98\" height=\"125\" \/><br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50310\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.8-Practice-Addition-and-Subtraction-Question-27.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.8-Practice-Addition-and-Subtraction-Question-27\" width=\"113\" height=\"156\" \/><\/p>\n<p>Question 28.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18701\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-210.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 210\" width=\"94\" height=\"128\" \/><br \/>\nAnswer :<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50311\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.8-Practice-Addition-and-Subtraction-Question-28.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.8-Practice-Addition-and-Subtraction-Question-28\" width=\"113\" height=\"156\" \/><\/p>\n<p>Question 29.<br \/>\n__ = 5 + 8<br \/>\nAnswer :<br \/>\n5 + 8<br \/>\n3 + 2 + 8<br \/>\n3 + 10 = 13<br \/>\nSo, 5 + 8 = 13<br \/>\nExplanation :<br \/>\nTo make addend 8 as 10 we should add 2 to the 8 so write addend 5 as\u00a0 3 + 2 .<br \/>\nthen add 2 + 8 we get , 10 and then later add 3 to 10 we get sum , 13 .<\/p>\n<p>Question 30.<br \/>\n__ = 12 &#8211; 5<br \/>\nAnswer :<br \/>\n12 &#8211; 5 =<br \/>\n12 &#8211; ( 2 + 3 )<br \/>\n10 &#8211; 3 = 7<br \/>\nSo, 12 &#8211; 5 = 7<br \/>\nExplanation :<br \/>\nThe subtrahend 5 is written as 2+ 3 so that the Minuend 12 is subtracted with 2 to get 10. then 3 is subtracted from 10 , we get difference as 7.<\/p>\n<p><strong>2.9 Problem Solving: Addition and Subtraction<\/strong><\/p>\n<p>Question 31.<br \/>\nSome friends are playing laser tag. 4 of them leave. There are 8 left. How many friends were there to start?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18702\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-211.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 211\" width=\"161\" height=\"105\" \/><br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-18703\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-212.png\" alt=\"Big Ideas Math Answer Key Grade 2 Chapter 2 Fluency and Strategies within 20 212\" width=\"614\" height=\"310\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-212.png 614w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Answer-Key-Grade-2-Chapter-2-Fluency-and-Strategies-within-20-212-300x151.png 300w\" sizes=\"(max-width: 614px) 100vw, 614px\" \/><br \/>\nAnswer :<br \/>\nNumber of friends playing = x<br \/>\nNumber of friends left = 4<br \/>\nNumber of friends left = 8 = x-4<br \/>\nx= 8 + 4 = 12<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-50312\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.9-Problem-Solving-Addition-and-Subtraction-Question-31.jpg\" alt=\"Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.9-Problem-Solving-Addition-and-Subtraction-Question-31\" width=\"836\" height=\"370\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.9-Problem-Solving-Addition-and-Subtraction-Question-31.jpg 836w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.9-Problem-Solving-Addition-and-Subtraction-Question-31-300x133.jpg 300w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/12\/Big-Ideas-Math-Book-2nd-Grade-Answer-key-Chapter-2-Fluency-and-Strategies-within-20-Fluency-and-Strategies-within-20-Chapter-Practice-2.9-Problem-Solving-Addition-and-Subtraction-Question-31-768x340.jpg 768w\" sizes=\"(max-width: 836px) 100vw, 836px\" \/><\/p>\n<p><em>Conclusion:<\/em><\/p>\n<p>I hope that you can resolve all your queries and access your preparation standard using the Big Ideas Math Book Grade 2 Chapter 2 Fluency and Strategies within 20 Solution Key. Step by step explanation for all questions are available at Big Ideas Math 2nd Grade 2nd Chapter Fluency and Strategies within 20 Answer Key. Bookmark our site to find the solution key of all Big Ideas Math Grade 2 Chapters.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Get Big Ideas Math Book 2rd Grade Answer Key Chapter 2 Fluency and Strategies within 20 on this page. This BIM Grade 2 Chapter 2 Fluency and Strategies within 20 Answer Key is useful for the students while preparing for the exams and preparation tests. You can download Big Ideas Math Answers Grade 2 Chapter &#8230; <a title=\"Big Ideas Math Answers Grade 2 Chapter 2 Fluency and Strategies within 20\" class=\"read-more\" href=\"https:\/\/bigideasmathanswers.com\/big-ideas-math-answers-grade-2-chapter-2\/\" aria-label=\"More on Big Ideas Math Answers Grade 2 Chapter 2 Fluency and Strategies within 20\">Read more<\/a><\/p>\n","protected":false},"author":9,"featured_media":89552,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":""},"categories":[4],"tags":[],"jetpack_featured_media_url":"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2020\/04\/Big-Ideas-Math-Answers-Grade-2-Chapter-2.png","_links":{"self":[{"href":"https:\/\/bigideasmathanswers.com\/wp-json\/wp\/v2\/posts\/18429"}],"collection":[{"href":"https:\/\/bigideasmathanswers.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/bigideasmathanswers.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/bigideasmathanswers.com\/wp-json\/wp\/v2\/users\/9"}],"replies":[{"embeddable":true,"href":"https:\/\/bigideasmathanswers.com\/wp-json\/wp\/v2\/comments?post=18429"}],"version-history":[{"count":1,"href":"https:\/\/bigideasmathanswers.com\/wp-json\/wp\/v2\/posts\/18429\/revisions"}],"predecessor-version":[{"id":90395,"href":"https:\/\/bigideasmathanswers.com\/wp-json\/wp\/v2\/posts\/18429\/revisions\/90395"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/bigideasmathanswers.com\/wp-json\/wp\/v2\/media\/89552"}],"wp:attachment":[{"href":"https:\/\/bigideasmathanswers.com\/wp-json\/wp\/v2\/media?parent=18429"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/bigideasmathanswers.com\/wp-json\/wp\/v2\/categories?post=18429"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/bigideasmathanswers.com\/wp-json\/wp\/v2\/tags?post=18429"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}