{"id":27709,"date":"2022-04-07T10:32:32","date_gmt":"2022-04-07T05:02:32","guid":{"rendered":"https:\/\/ccssmathanswers.com\/?p=27709"},"modified":"2022-04-07T11:20:22","modified_gmt":"2022-04-07T05:50:22","slug":"big-ideas-math-answers-grade-1-chapter-9","status":"publish","type":"post","link":"https:\/\/bigideasmathanswers.com\/big-ideas-math-answers-grade-1-chapter-9\/","title":{"rendered":"Big Ideas Math Answers Grade 1 Chapter 9 Add Two-Digit Numbers"},"content":{"rendered":"<p>Get the free pdf link to Download Big Ideas Math Answers Grade 1 Chapter 9 Add Two-Digit Numbers from here. This Big Ideas Math Book 1st Grade Answer Key Chapter 9 Add Two-Digit Numbers was designed by subject experts to assist the primary school students. We have provided the <a href=\"https:\/\/bigideasmathanswers.com\/big-ideas-math-answers-grade-1\/\">Big Ideas Math Answers Grade 1<\/a> Chapter 9 Add Two-Digit Numbers in the pdf format so that you can prepare offline.<\/p>\n<h2>Big Ideas Math Book 1st Grade Answer Key Chapter 9 Add Two-Digit Numbers<\/h2>\n<p>Start your preparation by taking help from Big Ideas Math Book 1st Grade Solution Key Chapter 9 Add Two-Digit Numbers and learn the concepts from practice tests, cumulative tests, and others. Big Ideas Math Answers Grade 1 Chapter 9 Add Two-Digit Numbers helps both Students and Teachers out there to get all the concepts underlying. Score good marks in your exams with the help of Big Ideas Math Book 1st Grade Answer Key Chapter 9 Add Two-Digit Numbers.<\/p>\n<p><strong>Vocabulary<\/strong><\/p>\n<ul>\n<li><a href=\"#Add_Two_Digit_Numbers_Vocabulary\">Add Two-Digit Numbers Vocabulary<\/a><\/li>\n<\/ul>\n<p><strong>Lesson: 1 Add Tens and Ones<\/strong><\/p>\n<ul>\n<li><a href=\"#Lesson_9.1_Add_Tens_and_Ones\">Lesson 9.1 Add Tens and Ones<\/a><\/li>\n<li><a href=\"#Add_Tens_and_Ones_Practice_9.1\">Add Tens and Ones Practice 9.1<\/a><\/li>\n<\/ul>\n<p><strong>Lesson: 2 Add Tens and Ones Using a Number Line<\/strong><\/p>\n<ul>\n<li><a href=\"#Lesson_9.2_Add_Tens_and_Ones_Using_a_Number_Line\">Lesson 9.2 Add Tens and Ones Using a Number Line<\/a><\/li>\n<li><a href=\"#Add_Tens_and_Ones_Using_a_Number_Line_Practice_9.2\">Add Tens and Ones Using a Number Line Practice 9.2<\/a><\/li>\n<\/ul>\n<p><strong>Lesson: 3 Make a 10 to Add<\/strong><\/p>\n<ul>\n<li><a href=\"#Lesson_9.3_Make_a_10_to_Add\">Lesson 9.3 Make a 10 to Add<\/a><\/li>\n<li><a href=\"#Make_a_10_to_Add_Practice_9.3\">Make a 10 to Add Practice 9.3<\/a><\/li>\n<\/ul>\n<p><strong>Lesson: 4 Add Two-Digit Numbers<\/strong><\/p>\n<ul>\n<li><a href=\"#Lesson_9.4_Add_Two_Digit_Numbers\">Lesson 9.4 Add Two-Digit Numbers<\/a><\/li>\n<li><a href=\"#Add_Two_Digit_Numbers_Practice_9.4\">Add Two-Digit Numbers Practice 9.4<\/a><\/li>\n<\/ul>\n<p><strong>Lesson: 5 Practice Addition Strategies<\/strong><\/p>\n<ul>\n<li><a href=\"#Lesson_9.5_Practice_Addition_Strategies\">Lesson 9.5 Practice Addition Strategies<\/a><\/li>\n<li><a href=\"#Practice_Addition_Strategies_Practice_9.5\">Practice Addition Strategies Practice 9.5<\/a><\/li>\n<\/ul>\n<p><strong>Lesson: 6 Problem Solving: Addition<\/strong><\/p>\n<ul>\n<li><a href=\"#Lesson_9.6_Problem_Solving:_Addition\">Lesson 9.6 Problem Solving: Addition<\/a><\/li>\n<li><a href=\"#Problem_Solving:_Addition_Practice_9.6\">Problem Solving: Addition Practice 9.6<\/a><\/li>\n<\/ul>\n<p><strong>Chapter-9: Add Two-Digit Numbers<\/strong><\/p>\n<ul>\n<li><a href=\"#Add_Two_Digit_Numbers_Performance_Task\">Add Two-Digit Numbers Performance Task<\/a><\/li>\n<li><a href=\"#Add_Two_Digit_Numbers_Change_Practice\">Add Two-Digit Numbers Change Practice<\/a><\/li>\n<\/ul>\n<h3><a id=\"Add_Two_Digit_Numbers_Vocabulary\"><\/a>Add Two-Digit Numbers Vocabulary<\/h3>\n<p><strong>Organize It<\/strong><\/p>\n<p>Review Words:<br \/>\n120 chart<br \/>\ncolumn<br \/>\nones<br \/>\nrow<br \/>\ntens<\/p>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-27711\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-9-Add-Two-Digit-Numbers-1.png\" alt=\"Big Ideas Math Answer Key Grade 1 Chapter 9 Add Two-Digit Numbers 1\" width=\"286\" height=\"151\" \/><br \/>\nAnswer:<br \/>\nTens and ones.<\/p>\n<p>Explanation:<br \/>\nThe first row represents the tens and second row represents the ones<br \/>\nIn tens row there are 3 lines 3 x 10 = 30.<br \/>\nIn ones row there 7 boxes 7 x 1 = 7<br \/>\nso, total there are 37<\/p>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-30301\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-compare-two-digit-numbers-chapter7.6-1.png\" alt=\"\" width=\"286\" height=\"151\" \/><\/p>\n<p><strong>Define It<\/strong><\/p>\n<p>Use the review words to complete the puzzle.<\/p>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-27710\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-9-Add-Two-Digit-Numbers-2.png\" alt=\"Big Ideas Math Answer Key Grade 1 Chapter 9 Add Two-Digit Numbers 2\" width=\"483\" height=\"257\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-9-Add-Two-Digit-Numbers-2.png 483w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-9-Add-Two-Digit-Numbers-2-300x160.png 300w\" sizes=\"(max-width: 483px) 100vw, 483px\" \/><br \/>\nAnswer:<br \/>\n1) 120Chart<br \/>\n<span style=\"font-size: 16px;\">2) Column<br \/>\n3)Row<\/span><\/p>\n<p><span style=\"font-size: 16px;\">Explanation:<br \/>\nFirst figure shows the numbers from 1 to 120.<br \/>\nThe vocabulary for the figure is 120 chart which is represented in the figure horizontally.<br \/>\nSecond figure shows columns colored<br \/>\nThe vocabulary for second figure is column<br \/>\nThird figure shows rows colored<br \/>\nThe vocabulary for the third figure is row<\/span><\/p>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-30304\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-compare-two-digit-numbers-chapter7.6-2.png\" alt=\"\" width=\"483\" height=\"257\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-compare-two-digit-numbers-chapter7.6-2.png 483w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-compare-two-digit-numbers-chapter7.6-2-300x160.png 300w\" sizes=\"(max-width: 483px) 100vw, 483px\" \/><\/p>\n<h3><a id=\"Lesson_9.1_Add_Tens_and_Ones\"><\/a>Lesson 9.1 Add Tens and Ones<\/h3>\n<p><strong>Explore and Grow<\/strong><\/p>\n<p>Show how you can use a model to solve.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27731\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-9-Add-Two-Digit-Numbers-3.png\" alt=\"Big Ideas Math Answer Key Grade 1 Chapter 9 Add Two-Digit Numbers 3\" width=\"155\" height=\"80\" \/><br \/>\n32 + 7 = _________<\/p>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-27730\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-9-Add-Two-Digit-Numbers-4.png\" alt=\"Big Ideas Math Answer Key Grade 1 Chapter 9 Add Two-Digit Numbers 4\" width=\"382\" height=\"337\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-9-Add-Two-Digit-Numbers-4.png 382w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-9-Add-Two-Digit-Numbers-4-300x265.png 300w\" sizes=\"(max-width: 382px) 100vw, 382px\" \/><br \/>\nAnswer:<br \/>\n32 + 7= 39 Three tens and 9 ones.<br \/>\nExplanation:<br \/>\nThe first row represents the tens and second row represents the ones<br \/>\nIn tens row there are 3 lines 3 x 10 = 30.<br \/>\nIn ones row there 9 boxes 9 x 1 = 9<br \/>\nso, total there are 39<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-30306\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.1.png\" alt=\"\" width=\"382\" height=\"337\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.1.png 382w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.1-300x265.png 300w\" sizes=\"(max-width: 382px) 100vw, 382px\" \/><\/p>\n<p><strong>Show and Grow<\/strong><\/p>\n<p>Question 1.<br \/>\n25 + 12 = _________<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27729\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-9-Add-Two-Digit-Numbers-5.png\" alt=\"Big Ideas Math Answer Key Grade 1 Chapter 9 Add Two-Digit Numbers 5\" width=\"142\" height=\"93\" \/><br \/>\nAnswer:<br \/>\n25 + 12 = 37 Three tens and 7 ones<br \/>\nExplanation:<br \/>\nThe first row represents the tens and second row represents the ones<br \/>\nIn tens row there are 2 lines 2 x 10 = 20.<br \/>\nIn ones row there 5 boxes 5 x 1 = 5<br \/>\nso, total there are 25.<br \/>\nThe first row represents the tens and second row represents the ones<br \/>\nIn tens row there are 1 lines 1 x 10 = 10.<br \/>\nIn ones row there 2 boxes 2 x 1 = 2<br \/>\nso, total there are 12<br \/>\nBy adding both the numbers the answer is 37.<\/p>\n<p>Question 2.<br \/>\n36 + 3 = __________<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27728\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-9-Add-Two-Digit-Numbers-6.png\" alt=\"Big Ideas Math Answer Key Grade 1 Chapter 9 Add Two-Digit Numbers 6\" width=\"158\" height=\"86\" \/><br \/>\nAnswer:<br \/>\n36 +3= 39, three tens and 9 ones<br \/>\nExplanation:<br \/>\nThe first row represents the tens and second row represents the ones<br \/>\nIn tens row there are 3 lines 3 x 10 = 30.<br \/>\nIn ones row there 6 boxes 6 x 1 = 6<br \/>\nso, total there are 36.<br \/>\nThe first row represents the tens and second row represents the ones<br \/>\nIn tens row there are 0 lines 0 x 10 = 0.<br \/>\nIn ones row there 3 boxes 3 x 1 = 3<br \/>\nso, total there are 3<br \/>\nBy adding both the numbers the answer is 39.<\/p>\n<p>Question 3.<br \/>\n21 + 8 = __________<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27727\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-9-Add-Two-Digit-Numbers-7.png\" alt=\"Big Ideas Math Answer Key Grade 1 Chapter 9 Add Two-Digit Numbers 7\" width=\"143\" height=\"89\" \/><br \/>\nAnswer:<br \/>\n21+ 8 = 29, 2 tens and 9 ones.<br \/>\nExplanation:<br \/>\nThe first row represents the tens and second row represents the ones<br \/>\nIn tens row there are 2 lines 2 x 10 = 20.<br \/>\nIn ones row there 1 boxes 1 x 1 = 1<br \/>\nso, total there are 1.<br \/>\nThe first row represents the tens and second row represents the ones<br \/>\nIn tens row there are 0 lines 0 x 10 = 0.<br \/>\nIn ones row there 8 boxes 8 x 1 = 8<br \/>\nso, total there are 8<br \/>\nBy adding both the numbers the answer is 29.<\/p>\n<p>Question 4.<br \/>\n22 + 24 = __________<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27726\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-9-Add-Two-Digit-Numbers-8.png\" alt=\"Big Ideas Math Answer Key Grade 1 Chapter 9 Add Two-Digit Numbers 8\" width=\"175\" height=\"94\" \/><br \/>\nAnswer:<br \/>\n22 + 24 = 46, 4 tens and 6 ones<br \/>\nExplanation:<br \/>\nThe first row represents the tens and second row represents the ones<br \/>\nIn tens row there are 2 lines 2 x 10 = 20.<br \/>\nIn ones row there 2 boxes 2 x 1 = 2<br \/>\nso, total there are 22.<br \/>\nThe first row represents the tens and second row represents the ones<br \/>\nIn tens row there are 2 lines 2 x 10 = 20.<br \/>\nIn ones row there 4 boxes 4 x 1 = 4<br \/>\nso, total there are 24<br \/>\nBy adding both the numbers the answer is 46.<\/p>\n<p><strong>Apply and Grow: Practice<\/strong><\/p>\n<p>Question 5.<br \/>\n34 + 4 = __________<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27725\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-9-Add-Two-Digit-Numbers-9.png\" alt=\"Big Ideas Math Answer Key Grade 1 Chapter 9 Add Two-Digit Numbers 9\" width=\"140\" height=\"88\" \/><br \/>\nAnswer:<br \/>\n34 + 4 = 38, 3 tens and 8 ones.<br \/>\nExplanation:<br \/>\nThe first row represents the tens and second row represents the ones<br \/>\nIn tens row there are 3 lines 3 x 10 = 30.<br \/>\nIn ones row there 4 boxes 4 x 1 = 4<br \/>\nso, total there are 34.<br \/>\nThe first row represents the tens and second row represents the ones<br \/>\nIn tens row there are 0 lines 0 x 10 = 0.<br \/>\nIn ones row there 4 boxes 4 x 1 = 4<br \/>\nso, total there are 4<br \/>\nBy adding both the numbers the answer is 38.<\/p>\n<p>Question 6.<br \/>\n43 + 15 = __________<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27724\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-9-Add-Two-Digit-Numbers-10.png\" alt=\"Big Ideas Math Answer Key Grade 1 Chapter 9 Add Two-Digit Numbers 10\" width=\"169\" height=\"89\" \/><\/p>\n<p>Answer:<br \/>\n43 + 15 = 58, 5 tens and 8 ones.<\/p>\n<p>Explanation:<br \/>\nThe first row represents the tens and second row represents the ones<br \/>\nIn tens row there are 4 lines 4 x 10 = 40.<br \/>\nIn ones row there 3 boxes 3 x 1 = 3<br \/>\nso, total there are 43.<br \/>\nThe first row represents the tens and second row represents the ones<br \/>\nIn tens row there are 1 lines 1 x 10 = 10.<br \/>\nIn ones row there 5 boxes 5 x 1 = 5.<br \/>\nso, total there are 15<br \/>\nBy adding both the numbers the answer is 58.<\/p>\n<p>Question 7.<br \/>\n71 + 20 = __________<br \/>\nAnswer:<br \/>\n71 + 20 = 91,<br \/>\n9 tens and 1 ones.<\/p>\n<p>Explanation:<br \/>\nThe number of choclates with rim is 71<br \/>\nThe number of choclates with jim is 20<br \/>\nTotal number of choclates is 91.<\/p>\n<p>Question 8.<br \/>\n93 + 6 = __________<br \/>\nAnswer:<br \/>\n93 + 6 = 99,<br \/>\n9 tens and 9 ones.<\/p>\n<p>Explanation:<br \/>\nThe number of choclates with rim is 93<br \/>\nThe number of choclates with jim is 6<br \/>\nTotal number of choclates is 99<\/p>\n<p>Question 9.<br \/>\n55 + 23 = __________<br \/>\nAnswer:<br \/>\n55 + 23 = 78, 7 tens and 8 ones.<\/p>\n<p>Explanation:<br \/>\nThe number of choclates with rim is 55<br \/>\nThe number of choclates with jim is 23<br \/>\nTotal number of choclates is 78.<\/p>\n<p>Question 10.<br \/>\n62 + 32 = __________<br \/>\nAnswer:<br \/>\n62 + 32 = 94, 9 tens and 4 ones.<\/p>\n<p>Explanation:<br \/>\nThe number of choclates with rim is 62<br \/>\nThe number of choclates with jim is 32<br \/>\nTotal number of choclates is 94.<\/p>\n<p>Question 11.<br \/>\n<strong>MP Reasoning<\/strong><br \/>\nCircle the number to complete the equation.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27723\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-9-Add-Two-Digit-Numbers-11.png\" alt=\"Big Ideas Math Answer Key Grade 1 Chapter 9 Add Two-Digit Numbers 11\" width=\"167\" height=\"90\" \/><br \/>\nAnswer:<br \/>\n41 + 5 = 46,<br \/>\nCircled the number 5.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-30309\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.2.png\" alt=\"\" width=\"167\" height=\"90\" \/><\/p>\n<p><strong>Think and Grow: Modeling Real Life<\/strong><\/p>\n<p>You watch television for 24 minutes in the morning and 32 minutes at night. How many minutes do you spend watching television in all?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27722\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-9-Add-Two-Digit-Numbers-12.png\" alt=\"Big Ideas Math Answer Key Grade 1 Chapter 9 Add Two-Digit Numbers 12\" width=\"113\" height=\"87\" \/><br \/>\nAddition equation:<\/p>\n<p>Model:<\/p>\n<p>___________ minutes<br \/>\nAnswer: 56<\/p>\n<p>Explanation:<br \/>\nModels: television,<br \/>\n24 minutes in the morning and 32 minutes in the night<br \/>\n24 + 32 = 56.<\/p>\n<p><strong>Show and Grow<\/strong><\/p>\n<p>Question 12.<br \/>\nYou do 42 jumping jacks in the morning and 46 at night. How many jumping jacks do you do in all?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27721\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-9-Add-Two-Digit-Numbers-13.png\" alt=\"Big Ideas Math Answer Key Grade 1 Chapter 9 Add Two-Digit Numbers 13\" width=\"72\" height=\"110\" \/><br \/>\nAddition equation:<\/p>\n<p>Model:<\/p>\n<p>___________ jumping jacks<br \/>\nAnswer: 88<\/p>\n<p>Explanation:<br \/>\nModels : Jumping jacks,<br \/>\n42 jumping jacks in the morning and 46 in the night<br \/>\n42 + 46 = 88. 88 Jumping jacks<\/p>\n<h3><a id=\"Add_Tens_and_Ones_Practice_9.1\"><\/a>Add Tens and Ones Practice 9.1<\/h3>\n<p>Question 1.<br \/>\n42 + 7 = _________<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27720\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-9-Add-Two-Digit-Numbers-14.png\" alt=\"Big Ideas Math Answer Key Grade 1 Chapter 9 Add Two-Digit Numbers 14\" width=\"172\" height=\"91\" \/><br \/>\nAnswer:<br \/>\n42 + 7 = 49, 4 tens and 9 ones.<\/p>\n<p>Explanation:<br \/>\nThe first row represents the tens and second row represents the ones<br \/>\nIn tens row there are 4 lines 4 x 10 = 40.<br \/>\nIn ones row there 2 boxes 2 x 1 = 2.<br \/>\nso, total there are 42.<br \/>\nThe first row represents the tens and second row represents the ones<br \/>\nIn tens row there are 0 lines 0 x 10 = 0.<br \/>\nIn ones row there 7 boxes 7 x 1 = 7<br \/>\nso, total there are 7<br \/>\nBy adding both the numbers the answer is 49.<\/p>\n<p>Question 2.<br \/>\n61 + 35 = __________<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27719\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-9-Add-Two-Digit-Numbers-15.png\" alt=\"Big Ideas Math Answer Key Grade 1 Chapter 9 Add Two-Digit Numbers 15\" width=\"208\" height=\"85\" \/><br \/>\nAnswer:<br \/>\n61 + 35 = 96, 9 tens and 6 ones.<\/p>\n<p>Explanation:<br \/>\nThe first row represents the tens and second row represents the ones<br \/>\nIn tens row there are 6 lines 6 x 10 = 60.<br \/>\nIn ones row there 1 boxes 1 x 1 = 1<br \/>\nso, total there are 61.<br \/>\nThe first row represents the tens and second row represents the ones<br \/>\nIn tens row there are 3 lines 3 x 10 = 30.<br \/>\nIn ones row there 5 boxes 5 x 1 = 5<br \/>\nso, total there are 35<br \/>\nBy adding both the numbers the answer is 96.<\/p>\n<p>Question 3.<br \/>\n74 + 11 = __________<br \/>\nAnswer:<br \/>\n74 + 11 = 85, 8 tens and 5 ones.<\/p>\n<p>Explanation:<br \/>\nThe number of choclates with rim is 74<br \/>\nThe number of choclates with jim is 11<br \/>\nTotal number of choclates is 85.<\/p>\n<p>Question 4.<br \/>\n86 + 2 = ___________<br \/>\nAnswer:<br \/>\n86 + 2 = 88, 8 tens and 8 ones.<\/p>\n<p>Explanation:<br \/>\nThe number of choclates with rim is 86<br \/>\nThe number of choclates with jim is 2<br \/>\nTotal number of choclates is 88.<\/p>\n<p>Question 5.<br \/>\n<strong>MP Reasoning<\/strong><br \/>\nCircle the number to complete the equation.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27718\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-9-Add-Two-Digit-Numbers-16.png\" alt=\"Big Ideas Math Answer Key Grade 1 Chapter 9 Add Two-Digit Numbers 16\" width=\"165\" height=\"85\" \/><br \/>\nAnswer:<br \/>\n22 + 70 =\u00a0 92, circled the 70 to complete the number.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-30312\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.2-1.png\" alt=\"\" width=\"167\" height=\"90\" \/><\/p>\n<p>Question 6.<\/p>\n<p><strong>Modeling Real Life<\/strong><br \/>\nYou eat 33 grapes. Your friend eats 23 grapes. How many grapes do you and your friend eat in all?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27717\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-9-Add-Two-Digit-Numbers-17.png\" alt=\"Big Ideas Math Answer Key Grade 1 Chapter 9 Add Two-Digit Numbers 17\" width=\"84\" height=\"56\" \/><\/p>\n<p>___________ grapes<br \/>\nAnswer: 55<\/p>\n<p>Explanation:<br \/>\nMe ate 33 and my friend ate 23 in all<br \/>\n33 + 23 = 55.<br \/>\nWe bote ate 55 in all.<\/p>\n<p><strong>Review &amp; Refresh<\/strong><\/p>\n<p>Question 7.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27716\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-9-Add-Two-Digit-Numbers-18.png\" alt=\"Big Ideas Math Answer Key Grade 1 Chapter 9 Add Two-Digit Numbers 18\" width=\"159\" height=\"93\" \/><br \/>\n__________ tens and _________ ones is _________ .<br \/>\nAnswer:<br \/>\n8 tens and 2 ones is 82<\/p>\n<p>Explanation:<br \/>\nThe first row represents the tens and second row represents the ones<br \/>\nIn tens row there are 8 lines 8 x 10 = 80.<br \/>\nIn ones row there 2 boxes 2 x 1 = 2<br \/>\nso, total there are 82.<\/p>\n<p>Question 8.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27715\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-9-Add-Two-Digit-Numbers-19.png\" alt=\"Big Ideas Math Answer Key Grade 1 Chapter 9 Add Two-Digit Numbers 19\" width=\"104\" height=\"91\" \/><br \/>\n__________ tens and _________ ones is _________ .<br \/>\nAnswer:<br \/>\n4 tens and 6 ones is 46<\/p>\n<p>Explanation:<br \/>\nThe first row represents the tens and second row represents the ones<br \/>\nIn tens row there are 4 lines 4 x 10 = 40.<br \/>\nIn ones row there 6 boxes 6 x 1 = 6<br \/>\nso, total there are 46.<\/p>\n<h3><a id=\"Lesson_9.2_Add_Tens_and_Ones_Using_a_Number_Line\"><\/a>Lesson 9.2 Add Tens and Ones Using a Number Line<\/h3>\n<p><strong>Explore and Grow<\/strong><\/p>\n<p>Color to show how you can use the hundred chart to find the sum.<\/p>\n<p>23 + 34 = ___________<\/p>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-27748\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-9-Add-Two-Digit-Numbers-20.png\" alt=\"Big Ideas Math Answers 1st Grade 1 Chapter 9 Add Two-Digit Numbers 20\" width=\"427\" height=\"420\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-9-Add-Two-Digit-Numbers-20.png 427w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-9-Add-Two-Digit-Numbers-20-300x295.png 300w\" sizes=\"(max-width: 427px) 100vw, 427px\" \/><br \/>\nAnswer:<br \/>\n23 + 34 = 57,<br \/>\n5 tens and 7 ones.<\/p>\n<p>Explanation:<br \/>\nIn the below figure 120 chart is shown in that 23 and 34 are colored<br \/>\nthat two numbers are added<br \/>\nto get the total sum.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-30314\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.2-2.png\" alt=\"\" width=\"427\" height=\"420\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.2-2.png 427w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.2-2-300x295.png 300w\" sizes=\"(max-width: 427px) 100vw, 427px\" \/><\/p>\n<p><strong>Show and Grow<\/strong><\/p>\n<p>Question 1.<br \/>\n22 + 7 = __________<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27747\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-9-Add-Two-Digit-Numbers-21.png\" alt=\"Big Ideas Math Answers 1st Grade 1 Chapter 9 Add Two-Digit Numbers 21\" width=\"422\" height=\"40\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-9-Add-Two-Digit-Numbers-21.png 422w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-9-Add-Two-Digit-Numbers-21-300x28.png 300w\" sizes=\"(max-width: 422px) 100vw, 422px\" \/><br \/>\nAnswer: 29<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-31547\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.1-3.png\" alt=\"\" width=\"428\" height=\"130\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.1-3.png 428w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.1-3-300x91.png 300w\" sizes=\"(max-width: 428px) 100vw, 428px\" \/><\/p>\n<p>Explanation:<br \/>\n22 + 7 = 29,<br \/>\nthe addition is represented on number line<\/p>\n<p>Question 2.<br \/>\n35 + 41 = __________<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27746\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-9-Add-Two-Digit-Numbers-22.png\" alt=\"Big Ideas Math Answers 1st Grade 1 Chapter 9 Add Two-Digit Numbers 22\" width=\"424\" height=\"42\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-9-Add-Two-Digit-Numbers-22.png 424w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-9-Add-Two-Digit-Numbers-22-300x30.png 300w\" sizes=\"(max-width: 424px) 100vw, 424px\" \/><br \/>\nAnswer:<br \/>\n35 + 41 = 76.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-31552\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.1-5.png\" alt=\"\" width=\"425\" height=\"159\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.1-5.png 425w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.1-5-300x112.png 300w\" sizes=\"(max-width: 425px) 100vw, 425px\" \/><\/p>\n<p>Explanation:<br \/>\n35 + 41 is represented on the number line.<\/p>\n<p><strong>Apply and Grow: practice<\/strong><\/p>\n<p>Question 3.<br \/>\n53 + 40 = _________<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27745\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-9-Add-Two-Digit-Numbers-23.png\" alt=\"Big Ideas Math Answers 1st Grade 1 Chapter 9 Add Two-Digit Numbers 23\" width=\"424\" height=\"43\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-9-Add-Two-Digit-Numbers-23.png 424w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-9-Add-Two-Digit-Numbers-23-300x30.png 300w\" sizes=\"(max-width: 424px) 100vw, 424px\" \/><br \/>\nAnswer:<br \/>\n53 + 40 = 93.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-31553\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.1-6.png\" alt=\"\" width=\"425\" height=\"159\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.1-6.png 425w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.1-6-300x112.png 300w\" sizes=\"(max-width: 425px) 100vw, 425px\" \/><\/p>\n<p>Question 4.<br \/>\n82 + 12 = __________<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27744\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-9-Add-Two-Digit-Numbers-24.png\" alt=\"Big Ideas Math Answers 1st Grade 1 Chapter 9 Add Two-Digit Numbers 24\" width=\"418\" height=\"37\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-9-Add-Two-Digit-Numbers-24.png 418w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-9-Add-Two-Digit-Numbers-24-300x27.png 300w\" sizes=\"(max-width: 418px) 100vw, 418px\" \/><br \/>\nAnswer: 82 + 12 = 94.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-31554\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.1-7.png\" alt=\"\" width=\"425\" height=\"159\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.1-7.png 425w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.1-7-300x112.png 300w\" sizes=\"(max-width: 425px) 100vw, 425px\" \/><\/p>\n<p>Question 5.<br \/>\n48 + 31 = ___________<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27744\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-9-Add-Two-Digit-Numbers-24.png\" alt=\"Big Ideas Math Answers 1st Grade 1 Chapter 9 Add Two-Digit Numbers 24\" width=\"418\" height=\"37\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-9-Add-Two-Digit-Numbers-24.png 418w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-9-Add-Two-Digit-Numbers-24-300x27.png 300w\" sizes=\"(max-width: 418px) 100vw, 418px\" \/><br \/>\nAnswer: 48 + 31 = 79.<br \/>\nFrom the above equation 48 is marked and from that point<br \/>\n3 points with 10 are taken and 1 with one is taken<br \/>\n48 + 31 = 79<\/p>\n<p>Question 6.<br \/>\n<strong>MP Structure<\/strong><br \/>\nWrite an equation that matches the number line.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27743\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-9-Add-Two-Digit-Numbers-25.png\" alt=\"Big Ideas Math Answers 1st Grade 1 Chapter 9 Add Two-Digit Numbers 25\" width=\"423\" height=\"142\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-9-Add-Two-Digit-Numbers-25.png 423w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-9-Add-Two-Digit-Numbers-25-300x101.png 300w\" sizes=\"(max-width: 423px) 100vw, 423px\" \/><br \/>\nAnswer: 37 + 23 = 60<\/p>\n<p>Explanation:<br \/>\nFrom the point 37 to 60<br \/>\n2 points with 10 are taken and 3 points with 1 are taken<br \/>\nso, the total equation is 37 + 23 = 60.<\/p>\n<p><strong>Think and Grow: Modeling Real Life<\/strong><\/p>\n<p>The home team scores 37 points. The visiting team scores 22 more. How many points does the visiting team score?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27742\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-9-Add-Two-Digit-Numbers-26.png\" alt=\"Big Ideas Math Answers 1st Grade 1 Chapter 9 Add Two-Digit Numbers 26\" width=\"109\" height=\"110\" \/><br \/>\nAddition equation:<\/p>\n<p>Model:<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27741\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-9-Add-Two-Digit-Numbers-27.png\" alt=\"Big Ideas Math Answers 1st Grade 1 Chapter 9 Add Two-Digit Numbers 27\" width=\"421\" height=\"26\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-9-Add-Two-Digit-Numbers-27.png 421w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-9-Add-Two-Digit-Numbers-27-300x19.png 300w\" sizes=\"(max-width: 421px) 100vw, 421px\" \/><\/p>\n<p>__________ points<br \/>\nAnswer: 37 + 22 = 59<\/p>\n<p>Explanation:<br \/>\nA point on the number line is taken as 37<br \/>\nFrom there 2 poins with 10 that is 20<br \/>\nFrom there 2 more points with 2 are taken<br \/>\ntotal it makes 22<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-31577\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.1-8.png\" alt=\"\" width=\"423\" height=\"142\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.1-8.png 423w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.1-8-300x101.png 300w\" sizes=\"(max-width: 423px) 100vw, 423px\" \/><\/p>\n<p><strong>Show and Grow<\/strong><\/p>\n<p>Question 7.<br \/>\nYour friend scores 63 points. You score 25 more than your friend. How many points do you score?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27740\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-9-Add-Two-Digit-Numbers-28.png\" alt=\"Big Ideas Math Answers 1st Grade 1 Chapter 9 Add Two-Digit Numbers 28\" width=\"91\" height=\"171\" \/><br \/>\nAddition equation:<\/p>\n<p>Model:<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27741\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-9-Add-Two-Digit-Numbers-27.png\" alt=\"Big Ideas Math Answers 1st Grade 1 Chapter 9 Add Two-Digit Numbers 27\" width=\"421\" height=\"26\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-9-Add-Two-Digit-Numbers-27.png 421w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-9-Add-Two-Digit-Numbers-27-300x19.png 300w\" sizes=\"(max-width: 421px) 100vw, 421px\" \/><\/p>\n<p>__________ points<br \/>\nAnswer: 63 + 25 = 88<br \/>\nExplanation:<br \/>\nA point on the number line is taken as 63<br \/>\nFrom there 2 poins with 10 that is 20<br \/>\nFrom there 5 more points with 5 are taken<br \/>\ntotal it makes 88.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-31580\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.1-9.png\" alt=\"\" width=\"466\" height=\"142\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.1-9.png 466w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.1-9-300x91.png 300w\" sizes=\"(max-width: 466px) 100vw, 466px\" \/><\/p>\n<h3><a id=\"Add_Tens_and_Ones_Using_a_Number_Line_Practice_9.2\"><\/a>Add Tens and Ones Using a Number Line Practice 9.2<\/h3>\n<p>Question 1.<br \/>\n13 + 60 = __________<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27739\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-9-Add-Two-Digit-Numbers-29.png\" alt=\"Big Ideas Math Answers 1st Grade 1 Chapter 9 Add Two-Digit Numbers 29\" width=\"422\" height=\"40\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-9-Add-Two-Digit-Numbers-29.png 422w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-9-Add-Two-Digit-Numbers-29-300x28.png 300w\" sizes=\"(max-width: 422px) 100vw, 422px\" \/><br \/>\nAnswer: 73<\/p>\n<p>Question 2.<br \/>\n81 + 8 = _____________<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27738\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-9-Add-Two-Digit-Numbers-30.png\" alt=\"Big Ideas Math Answers 1st Grade 1 Chapter 9 Add Two-Digit Numbers 30\" width=\"423\" height=\"27\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-9-Add-Two-Digit-Numbers-30.png 423w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-9-Add-Two-Digit-Numbers-30-300x19.png 300w\" sizes=\"(max-width: 423px) 100vw, 423px\" \/><br \/>\nAnswer: 89<\/p>\n<p>Question 3.<br \/>\n56 + 42 = ____________<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27738\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-9-Add-Two-Digit-Numbers-30.png\" alt=\"Big Ideas Math Answers 1st Grade 1 Chapter 9 Add Two-Digit Numbers 30\" width=\"423\" height=\"27\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-9-Add-Two-Digit-Numbers-30.png 423w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-9-Add-Two-Digit-Numbers-30-300x19.png 300w\" sizes=\"(max-width: 423px) 100vw, 423px\" \/><br \/>\nAnswer: 98<\/p>\n<p>Question 4.<br \/>\n<strong>MP Structure<\/strong><br \/>\nWrite an equation that matches the number line.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27737\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-9-Add-Two-Digit-Numbers-31.png\" alt=\"Big Ideas Math Answers 1st Grade 1 Chapter 9 Add Two-Digit Numbers 31\" width=\"421\" height=\"142\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-9-Add-Two-Digit-Numbers-31.png 421w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-9-Add-Two-Digit-Numbers-31-300x101.png 300w\" sizes=\"(max-width: 421px) 100vw, 421px\" \/><br \/>\nAnswer: 17 + 41= 58<\/p>\n<p>Question 5.<br \/>\n<strong>Modeling Real Life<\/strong><br \/>\nThere are 36 black keys on a piano. There are 16 more white keys than black keys. How many white keys are there?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27736\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-9-Add-Two-Digit-Numbers-32.png\" alt=\"Big Ideas Math Answers 1st Grade 1 Chapter 9 Add Two-Digit Numbers 32\" width=\"84\" height=\"92\" \/><br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27735\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-9-Add-Two-Digit-Numbers-33.png\" alt=\"Big Ideas Math Answers 1st Grade 1 Chapter 9 Add Two-Digit Numbers 33\" width=\"425\" height=\"30\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-9-Add-Two-Digit-Numbers-33.png 425w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-9-Add-Two-Digit-Numbers-33-300x21.png 300w\" sizes=\"(max-width: 425px) 100vw, 425px\" \/><\/p>\n<p>____________ white keys<br \/>\nAnswer: 52 white keys<\/p>\n<p><strong>Review &amp; Refresh<\/strong><\/p>\n<p>Question 6.<br \/>\n3 + 7 + 4 = ___________<br \/>\nAnswer: 14<\/p>\n<p>Question 7.<br \/>\n4 + 5 + 6 = ___________<br \/>\nAnswer: 15<\/p>\n<h3><a id=\"Lesson_9.3_Make_a_10_to_Add\"><\/a>Lesson 9.3 Make a 10 to Add<\/h3>\n<p><strong>Explore and Grow<\/strong><\/p>\n<p>How can you use the model to solve?<\/p>\n<p>38 + 6 = ___________<\/p>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-27780\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-9-Add-Two-Digit-Numbers-34.png\" alt=\"Big Ideas Math Answers Grade 1 Chapter 9 Add Two-Digit Numbers 34\" width=\"237\" height=\"140\" \/><br \/>\nAnswer:<br \/>\n38 + 6 = 44<\/p>\n<p>Explanation:<br \/>\nThe first row represents the tens and second row represents the ones<br \/>\nIn tens row there are 3 lines 3 x 10 = 30.<br \/>\nIn ones row there 8 boxes 8 x 1 = 8<br \/>\nso, total there are 38.<br \/>\nThe first row represents the tens and second row represents the ones<br \/>\nIn tens row there are 0 lines 0 x 10 = 0.<br \/>\nIn ones row there 6 boxes 6 x 1 = 6<br \/>\nso, total there are 6<br \/>\nBy adding both the numbers the answer is 44.<br \/>\nCount one numbers from both the sides 8 + 6 = 14<br \/>\nIt has 10 in it<\/p>\n<p><strong>Show and Grow<\/strong><\/p>\n<p>Question 1.<br \/>\n41 + 7 = ___________<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27779\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-9-Add-Two-Digit-Numbers-35.png\" alt=\"Big Ideas Math Answers Grade 1 Chapter 9 Add Two-Digit Numbers 35\" width=\"163\" height=\"88\" \/><br \/>\nMake a 10?\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Yes\u00a0 \u00a0 \u00a0 \u00a0 \u00a0No<br \/>\nAnswer: No<\/p>\n<p>Explanation:<br \/>\nBy adding ones place from both the sides<br \/>\n1 + 7 = 8<br \/>\nSo, the answer is no<\/p>\n<p>Question 2.<br \/>\n56 + 8 = ___________<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27778\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-9-Add-Two-Digit-Numbers-36.png\" alt=\"Big Ideas Math Answers Grade 1 Chapter 9 Add Two-Digit Numbers 36\" width=\"196\" height=\"91\" \/><br \/>\nMake a 10?\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Yes\u00a0 \u00a0 \u00a0 \u00a0 \u00a0No<br \/>\nAnswer: Yes<\/p>\n<p>Explanation:<br \/>\nBy adding ones place from both the sides<br \/>\n6 + 8 = 14<br \/>\nSo, there is 10 in it.<\/p>\n<p><strong>Apply and Grow: Practice<\/strong><\/p>\n<p>Question 3.<br \/>\n72 + 4 = _________<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27777\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-9-Add-Two-Digit-Numbers-37.png\" alt=\"Big Ideas Math Answers Grade 1 Chapter 9 Add Two-Digit Numbers 37\" width=\"195\" height=\"86\" \/><br \/>\nMake a 10?\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Yes\u00a0 \u00a0 \u00a0 \u00a0 \u00a0No<br \/>\nAnswer: No<\/p>\n<p>Explanation:<br \/>\nBy adding ones place from both the sides<br \/>\n2 + 4 = 6<br \/>\nSo, There is no 10 in it.<\/p>\n<p>Question 4.<br \/>\n63 + 9 = ___________<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27776\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-9-Add-Two-Digit-Numbers-38.png\" alt=\"Big Ideas Math Answers Grade 1 Chapter 9 Add Two-Digit Numbers 38\" width=\"199\" height=\"85\" \/><br \/>\nMake a 10?\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Yes\u00a0 \u00a0 \u00a0 \u00a0 \u00a0No<br \/>\nAnswer: Yes<\/p>\n<p>Explanation:<br \/>\nBy adding ones place from both the sides<br \/>\n3\u00a0 + 9 = 11<br \/>\nSo, there is 10 in it.<\/p>\n<p>Question 5.<br \/>\n14 + 6 = __________<br \/>\nMake a 10?\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Yes\u00a0 \u00a0 \u00a0 \u00a0 \u00a0No<br \/>\nAnswer: Yes<\/p>\n<p>Explanation:<br \/>\nBy adding ones place from both the sides<br \/>\n4 + 6 = 10<br \/>\nso, there is 10 in it.<\/p>\n<p>Question 6.<br \/>\n27 + 5 = __________<br \/>\nMake a 10?\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Yes\u00a0 \u00a0 \u00a0 \u00a0 \u00a0No<br \/>\nAnswer: Yes<\/p>\n<p>Explanation:<br \/>\nBy adding ones place from both the sides<br \/>\n7 + 5 = 12<br \/>\nSo, there is 10 in it.<\/p>\n<p>Question 7.<br \/>\n46 + 7 = ___________<br \/>\nMake a 10?\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Yes\u00a0 \u00a0 \u00a0 \u00a0 \u00a0No<br \/>\nAnswer: Yes<\/p>\n<p>Explanation:<br \/>\nBy adding ones place from both the sides<br \/>\n6 + 7 = 13<br \/>\nSo, there is 10 in it<\/p>\n<p>Question 8.<br \/>\n81 + 8 = ___________<br \/>\nMake a 10?\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Yes\u00a0 \u00a0 \u00a0 \u00a0 \u00a0No<br \/>\nAnswer: No<\/p>\n<p>Explanation:<br \/>\nBy adding ones place from both the sides<br \/>\n1 + 8 = 9<br \/>\nso, there is 10 in it.<\/p>\n<p><strong>MP Logic<\/strong><br \/>\nComplete.<br \/>\nQuestion 9.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27775\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-9-Add-Two-Digit-Numbers-39.png\" alt=\"Big Ideas Math Answers Grade 1 Chapter 9 Add Two-Digit Numbers 39\" width=\"153\" height=\"154\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-9-Add-Two-Digit-Numbers-39.png 153w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-9-Add-Two-Digit-Numbers-39-150x150.png 150w\" sizes=\"(max-width: 153px) 100vw, 153px\" \/><\/p>\n<p>Answer: 62<\/p>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-30970\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.1-1.png\" alt=\"\" width=\"153\" height=\"154\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.1-1.png 153w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.1-1-150x150.png 150w\" sizes=\"(max-width: 153px) 100vw, 153px\" \/><\/p>\n<p>Explanation:<br \/>\n56 + 6 = 62<br \/>\n56 + 4 makes 60 and 4 + 2 = 6<br \/>\n6 is divided as 4 + 2<br \/>\n60 + 2<\/p>\n<p>Question 10.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27774\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-9-Add-Two-Digit-Numbers-40.png\" alt=\"Big Ideas Math Answers Grade 1 Chapter 9 Add Two-Digit Numbers 40\" width=\"154\" height=\"158\" \/><br \/>\nAnswer: 48<\/p>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-30971\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.1-2.png\" alt=\"\" width=\"154\" height=\"158\" \/><br \/>\nExplanation:<br \/>\n39 + 9 = 48<br \/>\n39 + 1 = 40, 9 is divided to 1 and 8.<\/p>\n<p><strong>Think and Grow: Modeling Real Life<\/strong><\/p>\n<p>You put 17 puzzle pieces together. There are 7 left. How many puzzle pieces are there in all?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27773\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-9-Add-Two-Digit-Numbers-41.png\" alt=\"Big Ideas Math Answers Grade 1 Chapter 9 Add Two-Digit Numbers 41\" width=\"150\" height=\"114\" \/><br \/>\nAddition equation:<\/p>\n<p>Model:<\/p>\n<p>Make a 10?\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Yes\u00a0 \u00a0 \u00a0 \u00a0 \u00a0No<\/p>\n<p>___________ Puzzle pieces<br \/>\nAnswer: Yes.<\/p>\n<p>Explanation:<br \/>\n17 puzzle pieces are together<br \/>\n7 added to it<br \/>\n17 + 7 = 24<br \/>\nThe ones place of both sides are added 7 + 7 = 14<br \/>\nso, there is ten in it.<\/p>\n<p><strong>Show and Grow<\/strong><\/p>\n<p>Question 11.<br \/>\nYou color 46 states. There are 4 left. How many states are there in all?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27772\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-9-Add-Two-Digit-Numbers-42.png\" alt=\"Big Ideas Math Answers Grade 1 Chapter 9 Add Two-Digit Numbers 42\" width=\"147\" height=\"107\" \/><br \/>\nAddition equation:<\/p>\n<p>Model:<\/p>\n<p>Make a 10?\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Yes\u00a0 \u00a0 \u00a0 \u00a0 \u00a0No<\/p>\n<p>___________ States<br \/>\nAnswer: 50<\/p>\n<p>Explanation:<br \/>\nColored states are 46<br \/>\nuncolored states are 4<br \/>\nTotal states are 46 + 4 = 50<br \/>\n6 + 4 = 10<br \/>\nBoth the sides ones places are added<\/p>\n<h3><a id=\"Make_a_10_to_Add_Practice_9.3\"><\/a>Make a 10 to Add Practice 9.3<\/h3>\n<p>Question 1.<br \/>\n66 + 5 = __________<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27771\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-9-Add-Two-Digit-Numbers-43.png\" alt=\"Big Ideas Math Answers Grade 1 Chapter 9 Add Two-Digit Numbers 43\" width=\"194\" height=\"89\" \/><br \/>\nMake a 10?\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Yes\u00a0 \u00a0 \u00a0 \u00a0 \u00a0No<br \/>\nAnswer: yes<\/p>\n<p>Explanation:<br \/>\nNumber of lines which represents 10 is 6 that in tens place<br \/>\nin ones place both the sides 6 + 5 = 11<br \/>\nso, there is 10 in it<\/p>\n<p>Question 2.<br \/>\n74 + 3 = ____________<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27770\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-9-Add-Two-Digit-Numbers-44.png\" alt=\"Big Ideas Math Answers Grade 1 Chapter 9 Add Two-Digit Numbers 44\" width=\"212\" height=\"86\" \/><br \/>\nMake a 10?\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Yes\u00a0 \u00a0 \u00a0 \u00a0 \u00a0No<br \/>\nAnswer: No<\/p>\n<p>Explanation:<br \/>\nNumber of lines which represents 10 is 7 that in tens place<br \/>\nin ones place both the sides 4 + 3 = 7.<br \/>\nso, there is no 10 in it.<\/p>\n<p>Question 3.<br \/>\n28 + 8 _____________<br \/>\nMake a 10?\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Yes\u00a0 \u00a0 \u00a0 \u00a0 \u00a0No<br \/>\nAnswer: Yes<\/p>\n<p>Explanation:<br \/>\n2 represents tens place 2 x 10 = 20<br \/>\nIn ones place from both the sides 8 + 8 = 16<br \/>\nso, There is ten in it.<\/p>\n<p>Question 4.<br \/>\n52 + 9 = ______________<br \/>\nMake a 10?\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Yes\u00a0 \u00a0 \u00a0 \u00a0 \u00a0No<br \/>\nAnswer: Yes<\/p>\n<p>Explanation:<br \/>\n5 represents tens place 5 x 10 = 50<br \/>\nIn ones place from both the sides 2 + 9 = 11<br \/>\nso, There is ten in it.<br \/>\n52 + 9 = 61.<\/p>\n<p>Question 5.<br \/>\n26 + 7 = ____________<br \/>\nMake a 10?\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Yes\u00a0 \u00a0 \u00a0 \u00a0 \u00a0No<br \/>\nAnswer: yes<\/p>\n<p>Explanation:<br \/>\n2 represents tens place 2 x 10 = 20<br \/>\nIn ones place from both the sides 6 + 7 = 13<br \/>\nso, There is ten in it.<br \/>\n26 + 7 = 33.<\/p>\n<p>Question 6.<br \/>\n41 + 6 = ____________<br \/>\nMake a 10?\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Yes\u00a0 \u00a0 \u00a0 \u00a0 \u00a0No<br \/>\nAnswer: No<\/p>\n<p>Explanation:<br \/>\n4 represents tens place 4 x 10 = 40<br \/>\nIn ones place from both the sides 1 + 6 = 7<br \/>\nso, There is no ten in it.<br \/>\n41 + 6 = 47.<\/p>\n<p><strong>MP Logic<\/strong><br \/>\nComplete.<br \/>\nQuestion 7.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27769\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-9-Add-Two-Digit-Numbers-45.png\" alt=\"Big Ideas Math Answers Grade 1 Chapter 9 Add Two-Digit Numbers 45\" width=\"155\" height=\"157\" \/><br \/>\nAnswer: 41<\/p>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-31586\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.1-10.png\" alt=\"\" width=\"155\" height=\"157\" \/><br \/>\nExplanation:<br \/>\n37 + 4 = 41<br \/>\n4 is divided to 3 and 1<br \/>\n37 + 3 = 40<br \/>\n40 plus 1 is 41<\/p>\n<p>Question 8.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27768\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-9-Add-Two-Digit-Numbers-46.png\" alt=\"Big Ideas Math Answers Grade 1 Chapter 9 Add Two-Digit Numbers 46\" width=\"159\" height=\"152\" \/><br \/>\nAnswer: 54<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-31601\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.1-11.png\" alt=\"\" width=\"159\" height=\"157\" \/><\/p>\n<p>Explanation:<br \/>\n48 + 6 = 54<br \/>\n6 is divided in to 2 and 4<br \/>\n48 + 2 = 50 So, there is ten in it<br \/>\n50 + 4 = 54<\/p>\n<p>Question 9.<br \/>\n<strong>Modeling Real Life<\/strong><br \/>\nA snake lays 24 eggs. Another snake lays 9 eggs. How many eggs are there in all?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27767\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-9-Add-Two-Digit-Numbers-47.png\" alt=\"Big Ideas Math Answers Grade 1 Chapter 9 Add Two-Digit Numbers 47\" width=\"112\" height=\"74\" \/><br \/>\nAnswer:<br \/>\n33 eggs<\/p>\n<p>Explanation:<br \/>\nA snake lays 24 eggs<br \/>\nanother snake lays 9<br \/>\nthere are 33 eggs in all.<\/p>\n<p><strong>Review &amp; Refresh<\/strong><\/p>\n<p>Question 10.<br \/>\nColor the shapes that have 4 vertices.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27766\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-9-Add-Two-Digit-Numbers-48.png\" alt=\"Big Ideas Math Answers Grade 1 Chapter 9 Add Two-Digit Numbers 48\" width=\"455\" height=\"82\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-9-Add-Two-Digit-Numbers-48.png 455w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-9-Add-Two-Digit-Numbers-48-300x54.png 300w\" sizes=\"(max-width: 455px) 100vw, 455px\" \/><br \/>\nAnswer:\u00a0 Square and rectangle<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-31602\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.1-12.png\" alt=\"\" width=\"455\" height=\"82\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.1-12.png 455w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.1-12-300x54.png 300w\" sizes=\"(max-width: 455px) 100vw, 455px\" \/><\/p>\n<p>Explanation:<br \/>\nFor a square there are 4 vertices and for a rectangle there are 4 vertices. vertices are Nothing but corners or joining of the two lines.<\/p>\n<h3><a id=\"Lesson_9.4_Add_Two_Digit_Numbers\"><\/a>Lesson 9.4 Add Two-Digit Numbers<\/h3>\n<p><strong>Explore and Grow<\/strong><\/p>\n<p>Show how you can use a model to solve.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27800\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-9-Add-Two-Digit-Numbers-49.png\" alt=\"Big Ideas Math Answer Key Grade 1 Chapter 9 Add Two-Digit Numbers 49\" width=\"133\" height=\"89\" \/><\/p>\n<p>43 + 28 = _________<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27799\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-9-Add-Two-Digit-Numbers-50.png\" alt=\"Big Ideas Math Answer Key Grade 1 Chapter 9 Add Two-Digit Numbers 50\" width=\"379\" height=\"341\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-9-Add-Two-Digit-Numbers-50.png 379w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-9-Add-Two-Digit-Numbers-50-300x270.png 300w\" sizes=\"(max-width: 379px) 100vw, 379px\" \/><br \/>\nAnswer: 43 + 28 = 61<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-31603\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.1-13.png\" alt=\"\" width=\"379\" height=\"341\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.1-13.png 379w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.1-13-300x270.png 300w\" sizes=\"(max-width: 379px) 100vw, 379px\" \/><br \/>\nExplanation:<br \/>\n4 tens and 3 ones<br \/>\n2 tens and 8 ones<br \/>\nThe figure shows lines represents tens and<br \/>\ncircls represent ones<\/p>\n<p><strong>Show and Grow<\/strong><\/p>\n<p>Question 1.<br \/>\n39 + 45 = ?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27798\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-9-Add-Two-Digit-Numbers-51.png\" alt=\"Big Ideas Math Answer Key Grade 1 Chapter 9 Add Two-Digit Numbers 51\" width=\"440\" height=\"160\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-9-Add-Two-Digit-Numbers-51.png 440w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-9-Add-Two-Digit-Numbers-51-300x109.png 300w\" sizes=\"(max-width: 440px) 100vw, 440px\" \/><br \/>\n___________ tens __________ ones<br \/>\nAnswer: 7 tens and 14 ones<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-31605\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.3.png\" alt=\"\" width=\"440\" height=\"160\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.3.png 440w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.3-300x109.png 300w\" sizes=\"(max-width: 440px) 100vw, 440px\" \/><br \/>\nExplanation:<br \/>\nThe figure shows 39 represents 3 tens and 9 ones<br \/>\nand 4 tens 5 ones<br \/>\n3 + 4 = 7 and 9 + 5 = 14.<\/p>\n<p><strong>Apply and Grow: Practice<\/strong><\/p>\n<p>Question 2.<br \/>\n19 + 35 = ?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27797\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-9-Add-Two-Digit-Numbers-52.png\" alt=\"Big Ideas Math Answer Key Grade 1 Chapter 9 Add Two-Digit Numbers 52\" width=\"440\" height=\"163\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-9-Add-Two-Digit-Numbers-52.png 440w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-9-Add-Two-Digit-Numbers-52-300x111.png 300w\" sizes=\"(max-width: 440px) 100vw, 440px\" \/><br \/>\nAnswer: 1 + 3 = 4 and 9 + 5 = 14<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-31606\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.4.png\" alt=\"\" width=\"440\" height=\"163\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.4.png 440w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.4-300x111.png 300w\" sizes=\"(max-width: 440px) 100vw, 440px\" \/><br \/>\nExplanation:<br \/>\nFirst figure shows 1 tens and 9 ones<br \/>\n3 tens and 5 ones<br \/>\nThe second figure shows 1 + 3 = 4<br \/>\nand 9 + 5 = 14<\/p>\n<p>Question 3.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27796\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-9-Add-Two-Digit-Numbers-53.png\" alt=\"Big Ideas Math Answer Key Grade 1 Chapter 9 Add Two-Digit Numbers 53\" width=\"235\" height=\"157\" \/><br \/>\nAnswer: 60<br \/>\nExplanation:<br \/>\n43 + 17 = 60<br \/>\nIn the 4 and 3 are in tens place and 3 and 7 are in ones place<br \/>\nMy friend has 43 choclates and me has 17 more of it.<br \/>\nTotal choclates is 60.<\/p>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-31908\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.4-2.png\" alt=\"\" width=\"235\" height=\"157\" \/><\/p>\n<p>Question 4.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27795\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-9-Add-Two-Digit-Numbers-54.png\" alt=\"Big Ideas Math Answer Key Grade 1 Chapter 9 Add Two-Digit Numbers 54\" width=\"237\" height=\"159\" \/><br \/>\nAnswer: 81<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-31909\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.5.png\" alt=\"\" width=\"237\" height=\"159\" \/><\/p>\n<p>Explanation:<br \/>\n67 + 41 = 81<br \/>\nmy friend jim has 67 lollipops<br \/>\nand rim has 41 lollipops<br \/>\nin total jim and rim has 81 lollipops.<\/p>\n<p>Question 5.<br \/>\n<strong>YOU BE THE TEACHER<\/strong><br \/>\nIs the sum correct? Explain.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27794\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-9-Add-Two-Digit-Numbers-55.png\" alt=\"Big Ideas Math Answer Key Grade 1 Chapter 9 Add Two-Digit Numbers 55\" width=\"507\" height=\"202\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-9-Add-Two-Digit-Numbers-55.png 507w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-9-Add-Two-Digit-Numbers-55-300x120.png 300w\" sizes=\"(max-width: 507px) 100vw, 507px\" \/><br \/>\nAnswer: 76<br \/>\nExplanation:<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-31912\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.6.png\" alt=\"\" width=\"507\" height=\"202\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.6.png 507w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.6-300x120.png 300w\" sizes=\"(max-width: 507px) 100vw, 507px\" \/><\/p>\n<p>58 + 28 = 76<br \/>\nThe line represents 10 and circles represents 1<br \/>\n5 tens and 8 ones<br \/>\n2 tens and 8 ones<br \/>\nby adding 8 from the both places we get 16 and there is 10 in it.<\/p>\n<p><strong>Think and Grow: Modeling Real Life<\/strong><\/p>\n<p>You earn a sticker for every 10 pages you read. You read 34 pages one week and 37 the next. How many stickers do you earn?<br \/>\nAddition problem:<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27793\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-9-Add-Two-Digit-Numbers-56.png\" alt=\"Big Ideas Math Answer Key Grade 1 Chapter 9 Add Two-Digit Numbers 56\" width=\"60\" height=\"30\" \/><br \/>\nModel:<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27792\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-9-Add-Two-Digit-Numbers-57.png\" alt=\"Big Ideas Math Answer Key Grade 1 Chapter 9 Add Two-Digit Numbers 57\" width=\"159\" height=\"161\" \/><br \/>\nWrite the missing numbers:<br \/>\n_________ tens _________ one<br \/>\n__________ stickers<br \/>\nAnswer: 71<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-31913\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.6-1.png\" alt=\"\" width=\"159\" height=\"161\" \/><br \/>\nExplanation:<br \/>\nI earn a sticker for every 10 pages<br \/>\nfirst I read 34 pages and then 37 pages<br \/>\n34 + 37 = 71<br \/>\nso, total 71 pages for every 10 pages 1 sticker 7 stickers<\/p>\n<p><strong>Show and Grow<\/strong><\/p>\n<p>Question 6.<br \/>\nYou earn a coin for every lo cans you recycle. You recycle 18 cans one week and 25 the next. How many coins do you earn?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27791\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-9-Add-Two-Digit-Numbers-58.png\" alt=\"Big Ideas Math Answer Key Grade 1 Chapter 9 Add Two-Digit Numbers 58\" width=\"66\" height=\"67\" \/><br \/>\nAddition problem:<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27790\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-9-Add-Two-Digit-Numbers-59.png\" alt=\"Big Ideas Math Answer Key Grade 1 Chapter 9 Add Two-Digit Numbers 59\" width=\"60\" height=\"34\" \/><br \/>\nModel:<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27789\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-9-Add-Two-Digit-Numbers-60.png\" alt=\"Big Ideas Math Answer Key Grade 1 Chapter 9 Add Two-Digit Numbers 60\" width=\"153\" height=\"161\" \/><br \/>\nWrite the missing numbers:<br \/>\n_________ tens _________ one<br \/>\n__________ coins<br \/>\nAnswer:\u00a0 4 tens and 3 ones 4 coins<br \/>\nExplanation:<br \/>\nIf I recycle 10 cans I get 1 coin<br \/>\nin first week i recycled 18 cans and in next week 25 cans<br \/>\n18 + 25 = 43.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-31915\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.6-3.png\" alt=\"\" width=\"159\" height=\"161\" \/><\/p>\n<h3><a id=\"Add_Two_Digit_Numbers_Practice_9.4\"><\/a>Add Two-Digit Numbers Practice 9.4<\/h3>\n<p>Question 1.<br \/>\n57 + 15 = ?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27788\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-9-Add-Two-Digit-Numbers-61.png\" alt=\"Big Ideas Math Answer Key Grade 1 Chapter 9 Add Two-Digit Numbers 61\" width=\"489\" height=\"196\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-9-Add-Two-Digit-Numbers-61.png 489w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-9-Add-Two-Digit-Numbers-61-300x120.png 300w\" sizes=\"(max-width: 489px) 100vw, 489px\" \/><br \/>\nAnswer: 57 + 15 = 72<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-31916\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.6-4.png\" alt=\"\" width=\"489\" height=\"196\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.6-4.png 489w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.6-4-300x120.png 300w\" sizes=\"(max-width: 489px) 100vw, 489px\" \/><\/p>\n<p>Explanation:<br \/>\nIn 57 5 tens and 7 ones<br \/>\nin 15 1 tens and 5 ones<br \/>\nIf we add both we get 7 tens and 2 ones.<\/p>\n<p>Question 2.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27787\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-9-Add-Two-Digit-Numbers-62.png\" alt=\"Big Ideas Math Answer Key Grade 1 Chapter 9 Add Two-Digit Numbers 62\" width=\"231\" height=\"157\" \/><br \/>\nAnswer: 76<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-31917\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.6-5.png\" alt=\"\" width=\"231\" height=\"157\" \/><br \/>\nExplanation:<br \/>\nIn 40 4 tens and 0 ones<br \/>\nin 36 3 tens and 6 ones<br \/>\nif we add both we get 7 tens and 6 ones.<\/p>\n<p>Question 3.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27786\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-9-Add-Two-Digit-Numbers-63.png\" alt=\"Big Ideas Math Answer Key Grade 1 Chapter 9 Add Two-Digit Numbers 63\" width=\"232\" height=\"157\" \/><br \/>\nAnswer: 81<br \/>\nExplanation:<br \/>\nIn 29 2 tens and 9 ones<br \/>\nin 52 5 tens and\u00a0 2 ones<br \/>\nIf we add both 29 and 52 is 81<br \/>\n8 tens and 1 ones.<\/p>\n<p>Question 4.<br \/>\n<strong>DIG DEEPER!<\/strong><br \/>\nDo you need to use the make a 10 strategy to find each sum?<br \/>\n28 + 34 = ?\u00a0 \u00a0 \u00a0 Yes\u00a0 \u00a0 \u00a0 No<br \/>\n56 + 15 = ?\u00a0 \u00a0 \u00a0 Yes\u00a0 \u00a0 \u00a0 No<br \/>\n42 + 21 = ?\u00a0 \u00a0 \u00a0 Yes\u00a0 \u00a0 \u00a0 No<br \/>\n68 + 11 = ?\u00a0 \u00a0 \u00a0 Yes\u00a0 \u00a0 \u00a0 No<br \/>\nAnswer:<br \/>\n28 + 34 = 62\u00a0 \u00a0 \u00a0 Yes<br \/>\n56 + 15 = 71\u00a0 \u00a0 Yes<br \/>\n42 + 21 = 63\u00a0 \u00a0 \u00a0 No<br \/>\n68 + 11 = 79\u00a0 \u00a0 \u00a0No<br \/>\nExplanation:<br \/>\nIn first sum 28 + 34<br \/>\nif we take 8 and 4 and add we get 12 taken from ones place<br \/>\nwe get 10 in it.<br \/>\nIn second sum 56 + 15<br \/>\nif we take 6 and 5 and add we get 11 taken from ones place<br \/>\nwe get 10 in it.<br \/>\nIn third sum 42 + 21<br \/>\nif we take 2 and 1 and add we get 3 taken from ones place<br \/>\nwe didn&#8217;t get 10 in it<br \/>\nIn fourth sum 68 + 11<br \/>\nif we take 8 and 1 and add we get 9 taken from ones place<br \/>\nwe didn&#8217;t get 10 in it.<\/p>\n<p>Question 5.<br \/>\nYou need a box for every 10 muffins you make. You make 33 blueberry muffins and 47 banana muffins. How many boxes do you need?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27785\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-9-Add-Two-Digit-Numbers-64.png\" alt=\"Big Ideas Math Answer Key Grade 1 Chapter 9 Add Two-Digit Numbers 64\" width=\"109\" height=\"78\" \/><\/p>\n<p>__________ boxes<br \/>\nAnswer: 8 boxes<br \/>\nExplanation:<br \/>\nWe need a box for 10 muffins that we make<br \/>\nWe made 33 blueberry muffins<br \/>\nand 47 banana muffins<br \/>\nif we add we get 33 + 47 = 80<br \/>\nso, I get 8 boxes.<\/p>\n<p><strong>Review &amp; Refresh<\/strong><\/p>\n<p>Question 6.<br \/>\nIs the equation true or false?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27784\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-9-Add-Two-Digit-Numbers-65.png\" alt=\"Big Ideas Math Answer Key Grade 1 Chapter 9 Add Two-Digit Numbers 65\" width=\"386\" height=\"127\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-9-Add-Two-Digit-Numbers-65.png 386w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-9-Add-Two-Digit-Numbers-65-300x99.png 300w\" sizes=\"(max-width: 386px) 100vw, 386px\" \/><br \/>\nAnswer: 15 = 16 false<\/p>\n<p>Explanation:<br \/>\n6+ 9 = 15 and 17 &#8211; 1= 16<br \/>\n15 is not equal to 16<\/p>\n<h3><a id=\"Lesson_9.5_Practice_Addition_Strategies\"><\/a>Lesson 9.5 Practice Addition Strategies<\/h3>\n<p><strong>Explore and Grow<\/strong><\/p>\n<p>Show two ways you can find the sum.<\/p>\n<p>23 + 39 = __________<\/p>\n<p>23 + 39 = __________<\/p>\n<p>Answer:\u00a0 23 + 39 = 62<br \/>\nExplanation: one method<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-31919\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.7.png\" alt=\"\" width=\"357\" height=\"154\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.7.png 357w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.7-300x129.png 300w\" sizes=\"(max-width: 357px) 100vw, 357px\" \/><br \/>\nsecond method<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-31928\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.8.png\" alt=\"\" width=\"330\" height=\"154\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.8.png 330w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.8-300x140.png 300w\" sizes=\"(max-width: 330px) 100vw, 330px\" \/><\/p>\n<p><strong>Show and Grow<\/strong><\/p>\n<p>Question 1.<br \/>\n47 + 24 = ________<br \/>\nAnswer: 72<\/p>\n<p>Explanation:<br \/>\n4 tens and 7 ones<br \/>\n2 tens and 4 ones<br \/>\ntens represents the lines and ones represents the circles<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-31932\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.8-1.png\" alt=\"\" width=\"217\" height=\"85\" \/><\/p>\n<p>Question 2.<br \/>\n38 + 43 = ________<br \/>\nAnswer: 81<\/p>\n<p>Explanation:<br \/>\n3 tens and 8 ones<br \/>\n4 tens and 3 ones<br \/>\ntens represents the lines and ones represents circles<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-31933\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.8-2.png\" alt=\"\" width=\"217\" height=\"85\" \/><\/p>\n<p><strong>Apply and Grow: Practice<\/strong><\/p>\n<p>Question 3.<br \/>\n22 + 18 = ________<br \/>\nAnswer: 40<\/p>\n<p>Explanation:<br \/>\n2 tens and 2 ones<br \/>\n1 tens and 8 ones<br \/>\ntens represents the lines and ones represents the circles<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-31936\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.8-3.png\" alt=\"\" width=\"217\" height=\"85\" \/><\/p>\n<p>Question 4.<br \/>\n57 + 34 = __________<br \/>\nAnswer: 91<\/p>\n<p>Explanation:<br \/>\n5 tens and 7 ones<br \/>\n3 tens and 4 ones<br \/>\nlines represents the tens and circles represents the ones<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-31939\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.8-4.png\" alt=\"\" width=\"217\" height=\"85\" \/><\/p>\n<p>Question 5.<br \/>\n73 + 19 = __________<br \/>\nAnswer: 92<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-31943\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.9.png\" alt=\"\" width=\"287\" height=\"151\" \/><br \/>\nExplanation:<br \/>\nlines represents the tens and circles represents the ones<br \/>\n7 ten and 3 ones<br \/>\n1 tens and 9 ones<\/p>\n<p>Question 6.<br \/>\n81 + 11 = __________<br \/>\nAnswer: 92<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-31945\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.9-1.png\" alt=\"\" width=\"287\" height=\"151\" \/><\/p>\n<p>Explanation:<br \/>\nthe lines represents tens and the circles represents ones<br \/>\n8 tens and 1 ones<br \/>\n1 tens and 1 ones<br \/>\nIf we add both we get<br \/>\n92<\/p>\n<p>Question 7.<br \/>\n<strong>YOU BE THE TEACHER<\/strong><br \/>\nIs the sum correct? Explain.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27807\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-9-Add-Two-Digit-Numbers-66.png\" alt=\"Big Ideas Math Answers 1st Grade 1 Chapter 9 Add Two-Digit Numbers 66\" width=\"507\" height=\"157\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-9-Add-Two-Digit-Numbers-66.png 507w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-9-Add-Two-Digit-Numbers-66-300x93.png 300w\" sizes=\"(max-width: 507px) 100vw, 507px\" \/><br \/>\nAnswer: No<\/p>\n<p>Explanation:<br \/>\nno the sum is not correct.<br \/>\nBut figure shown is correct<br \/>\n17 + 26 = 43<\/p>\n<p><strong>Think and Grow: Modeling Real Life<\/strong><\/p>\n<p>You hove 48 songs. Your friend has 27 more than you. How many songs does your friend have?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27806\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-9-Add-Two-Digit-Numbers-67.png\" alt=\"Big Ideas Math Answers 1st Grade 1 Chapter 9 Add Two-Digit Numbers 67\" width=\"128\" height=\"139\" \/><br \/>\nAddition equation:<\/p>\n<p>Model:<\/p>\n<p>____________ songs<br \/>\nAnswer: 75 songs<\/p>\n<p>Explanation:<br \/>\nModel : songs<br \/>\nI have 48 songs<br \/>\nand my friend had 27 more than me<br \/>\nTotal songs that my friend had is 48 + 27 = 75 songs<\/p>\n<p><strong>Show and Grow<\/strong><\/p>\n<p>Question 8.<br \/>\nYour friend sells 56 candles. You sell 35 more than your friend. How many candles do you sell?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27805\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-9-Add-Two-Digit-Numbers-68.png\" alt=\"Big Ideas Math Answers 1st Grade 1 Chapter 9 Add Two-Digit Numbers 68\" width=\"92\" height=\"87\" \/><br \/>\nAddition equation:<\/p>\n<p>Model:<\/p>\n<p>____________ candles<br \/>\nAnswer: 91 candles<\/p>\n<p>Explanation:<br \/>\nModels: candles<br \/>\nMy friend has 56 candles<br \/>\nand me has 35 more than my friend<br \/>\nso, I had 91 candles with me<\/p>\n<h3><a id=\"Practice_Addition_Strategies_Practice_9.5\"><\/a>Practice Addition Strategies Practice 9.5<\/h3>\n<p>Question 1.<br \/>\n62 + 29 = _______<br \/>\nAnswer: 99<\/p>\n<p>Explanation:<br \/>\n6 tens and 2 ones<br \/>\n2 tens and 9 ones<br \/>\nby adding both the numbers i get is 99<\/p>\n<p>Question 2.<br \/>\n84 + 8 = ________<br \/>\nAnswer: 92<\/p>\n<p>Explanation:<br \/>\n8 tens and 4 ones<br \/>\n0 tens and 8 ones<br \/>\nby adding both the numbers i get is 92<\/p>\n<p>Question 3.<br \/>\n75 + 17 = ________<br \/>\nAnswer: 92<\/p>\n<p>Explanation:<br \/>\n7 tens and 5 ones<br \/>\n1 tens and 7 ones<br \/>\nby adding both the numbers i get is 92<\/p>\n<p>Question 4.<br \/>\n<strong>YOU BE THE TEACHER<\/strong><br \/>\nIs the sum correct? Explain.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27804\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-9-Add-Two-Digit-Numbers-69.png\" alt=\"Big Ideas Math Answers 1st Grade 1 Chapter 9 Add Two-Digit Numbers 69\" width=\"506\" height=\"175\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-9-Add-Two-Digit-Numbers-69.png 506w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-9-Add-Two-Digit-Numbers-69-300x104.png 300w\" sizes=\"(max-width: 506px) 100vw, 506px\" \/><br \/>\nAnswer:<\/p>\n<p>Question 5.<br \/>\nModeling Real Life You collect 12 leaves. Your friend collects 26 more than you. How many leaves does your friend collect?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27803\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-9-Add-Two-Digit-Numbers-70.png\" alt=\"Big Ideas Math Answers 1st Grade 1 Chapter 9 Add Two-Digit Numbers 70\" width=\"134\" height=\"128\" \/><\/p>\n<p>____________ leaves<br \/>\nAnswer: 38 leaves<\/p>\n<p>Explanation:<br \/>\nI collect 12 leaves and my friend collect 26 more than me<br \/>\ntotal leaves my friend had is<br \/>\n12 + 26 = 38 leaves.<\/p>\n<p><strong>Review &amp; Refresh<\/strong><\/p>\n<p>Question 6.<br \/>\nCircle the measurable attributes of the table.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27802\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-9-Add-Two-Digit-Numbers-71.png\" alt=\"Big Ideas Math Answers 1st Grade 1 Chapter 9 Add Two-Digit Numbers 71\" width=\"449\" height=\"113\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-9-Add-Two-Digit-Numbers-71.png 449w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-9-Add-Two-Digit-Numbers-71-300x76.png 300w\" sizes=\"(max-width: 449px) 100vw, 449px\" \/><br \/>\nAnswer: length or height.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-31949\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.9-2.png\" alt=\"\" width=\"449\" height=\"113\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.9-2.png 449w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.9-2-300x76.png 300w\" sizes=\"(max-width: 449px) 100vw, 449px\" \/><\/p>\n<p>Explanation:<br \/>\nFor table length or height is the measuring attribute<br \/>\ncubes represents to measure the length and height.<\/p>\n<h3><a id=\"Lesson_9.6_Problem_Solving:_Addition\"><\/a>Lesson 9.6 Problem Solving: Addition<\/h3>\n<p><strong>Explore and Grow<\/strong><\/p>\n<p>Model the story.<\/p>\n<p>Newton has 15 dog bones. Descartes gives him 8 more. How many dog bones does Newton have now?<\/p>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-27817\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-9-Add-Two-Digit-Numbers-72.png\" alt=\"Big Ideas Math Answers Grade 1 Chapter 9 Add Two-Digit Numbers 72\" width=\"456\" height=\"112\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-9-Add-Two-Digit-Numbers-72.png 456w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-9-Add-Two-Digit-Numbers-72-300x74.png 300w\" sizes=\"(max-width: 456px) 100vw, 456px\" \/><br \/>\nAnswer: 23 bones<\/p>\n<p>Explanation:<br \/>\nNewton has 15 bones and Descartes gave him 8 more<br \/>\nThe total bones newton had is 23 bones.<\/p>\n<p><strong>Show and Grow<\/strong><\/p>\n<p>Question 1.<br \/>\nYou have 49 toy soldiers. You buy some more. Now you have 84. How many toy soldiers did you buy?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27816\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-9-Add-Two-Digit-Numbers-73.png\" alt=\"Big Ideas Math Answers Grade 1 Chapter 9 Add Two-Digit Numbers 73\" width=\"60\" height=\"90\" \/><br \/>\nCircle what you know:<\/p>\n<p>Underline what you need to find.<\/p>\n<p>Solve:<\/p>\n<p>_____________ toy soldiers<br \/>\nAnswer: 35 toy soldiers<\/p>\n<p>Explanation:<br \/>\nI have 49 toy soldiers<br \/>\nIf i buy 35 more<br \/>\nThen i will have 84 in total.<\/p>\n<p><strong>Apply and Grow: Practice<\/strong><\/p>\n<p>Question 2.<br \/>\nYou have 55 pounds of dog food and some cat food. You have 63 pounds of pet food in all. How many pounds of cat food do you have?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27815\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-9-Add-Two-Digit-Numbers-74.png\" alt=\"Big Ideas Math Answers Grade 1 Chapter 9 Add Two-Digit Numbers 74\" width=\"87\" height=\"136\" \/><br \/>\nCircle what you know.<\/p>\n<p>Underline what you need to find.<\/p>\n<p>Solve:<\/p>\n<p>___________ pounds<br \/>\nAnswer:\u00a0 8 pounds<\/p>\n<p>Explanation:<br \/>\nI have 55 pound of dog food<br \/>\nIf i had 8 pounds of cat food<br \/>\nIn total the pet food had is 63 pounds<\/p>\n<p>Question 3.<br \/>\nA teacher has 34 erasers. There are 46 fewer erasers than pencils. How many pencils are there?<\/p>\n<p>____________ pencils<br \/>\nAnswer:<\/p>\n<p>Question 4.<br \/>\n<strong>DIG DEEPER!<\/strong><br \/>\nYou have 25 toys. Your friend has more than you. There are more than 60 toys in all. How many toys can your friend have?<br \/>\n29\u00a0 \u00a0 \u00a0 \u00a033\u00a0 \u00a0 \u00a0 \u00a024\u00a0 \u00a0 \u00a0 38<br \/>\nAnswer: 35 toys<\/p>\n<p>Explanation:<br \/>\nI have 25 toys<br \/>\nand if had 35 then the total toys will be 60<br \/>\naccording to the given options it might be less than 35<br \/>\n29, 33 or 24<\/p>\n<p><strong>Think and Grow: Modeling Real Life<\/strong><\/p>\n<p>You need 60 invitations. You have 36 and buy 36 more. Do you have enough invitations?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27814\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-9-Add-Two-Digit-Numbers-75.png\" alt=\"Big Ideas Math Answers Grade 1 Chapter 9 Add Two-Digit Numbers 75\" width=\"122\" height=\"94\" \/><br \/>\nCircle what you know.<\/p>\n<p>Underline what you need to find.<\/p>\n<p>Solve:<\/p>\n<p>Compare: ___________ \u25cb 60\u00a0 \u00a0 \u00a0 \u00a0 Yes\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 No<br \/>\nAnswer: yes<\/p>\n<p>Explanation:<br \/>\n66 &gt; 60<br \/>\nI had 6 more invitations<br \/>\nYes they have enough invitations.<\/p>\n<p><strong>Show and Grow<\/strong><\/p>\n<p>Question 5.<br \/>\nYou need 84 bottles of water. You have 48 and buy 32 more. Do you have enough bottles of water?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27813\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-9-Add-Two-Digit-Numbers-76.png\" alt=\"Big Ideas Math Answers Grade 1 Chapter 9 Add Two-Digit Numbers 76\" width=\"93\" height=\"76\" \/><br \/>\nCircle what you know.<\/p>\n<p>Underline what you need to find.<\/p>\n<p>Solve:<\/p>\n<p>Compare: ___________ \u25cb 84\u00a0 \u00a0 \u00a0 \u00a0 Yes\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 No<br \/>\nAnswer:\u00a0 No<\/p>\n<p>Explanation:<br \/>\nThe water bottles I had 80<br \/>\nThe water bottles needed is 84<br \/>\n80 &lt; 84<br \/>\nso, there are no enough waterbottles<\/p>\n<h3><a id=\"Problem_Solving:_Addition_Practice_9.6\"><\/a>Problem Solving: Addition Practice 9.6<\/h3>\n<p>Question 1.<br \/>\nYou have 31 stuffed animals. You and your friend have 60 stuffed animals in all. How many stuffed animals does your friend have?<\/p>\n<p>______________ stuffed animals<br \/>\nAnswer:\u00a0 29<\/p>\n<p>Explanation:<br \/>\n31 + 29 = 60,<br \/>\nThere are 29 stuffed animals with my friend.<\/p>\n<p>Question 2.<br \/>\nA store has 56 shirts. There are 28 fewer shirts than pairs of pants. How many pairs of pants are there?<\/p>\n<p>______________ Pairs of pants<br \/>\nAnswer: 28<\/p>\n<p>Explanation:<br \/>\nTotal shirts is 56 and 56 &#8211; 28 = 28,<br \/>\nThe pairs of paints are 28.<br \/>\n28 + 28 = 56.<\/p>\n<p>Question 3.<br \/>\n<strong>YOU BE THE TEACHER<\/strong><br \/>\nYou have 25 movies. You have 18 more video games than movies. Your friend says you have (43 movies and video games in all. Is your friend correct? Explain.<\/p>\n<p>___________________________________________________<\/p>\n<p>___________________________________________________<br \/>\nAnswer: 43:<\/p>\n<p>Explanation<br \/>\nMe having 25 movies and 18 videogames 25 + 18 = 43,<br \/>\nYes my friend is correct I have 43 movies and\u00a0 videogames in all.<\/p>\n<p>Question 4.<br \/>\n<strong>Modeling Real Life<\/strong><br \/>\nNewton needs 9o chairs for a party. He has 51. He rents 3 more. Does Newton have enough chairs?<\/p>\n<p>Circle: \u00a0 \u00a0 \u00a0 \u00a0 Yes\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 No<br \/>\nAnswer: No,<\/p>\n<p>Explanation:<br \/>\nNewton doesn&#8217;t have enough chairs.<br \/>\nHe needed is 90 he has 51 + 3 = 54.<\/p>\n<p><strong>Review &amp; Refresh<\/strong><\/p>\n<p>Circle the longer object.<\/p>\n<p>Question 5.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27812\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-9-Add-Two-Digit-Numbers-77.png\" alt=\"Big Ideas Math Answers Grade 1 Chapter 9 Add Two-Digit Numbers 77\" width=\"194\" height=\"128\" \/><br \/>\nAnswer:<br \/>\nThe scissor is longer than the brick<br \/>\ncircled the scissor<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-31953\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.1-15.png\" alt=\"\" width=\"194\" height=\"128\" \/><\/p>\n<p>Question 6.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27811\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-9-Add-Two-Digit-Numbers-78.png\" alt=\"Big Ideas Math Answers Grade 1 Chapter 9 Add Two-Digit Numbers 78\" width=\"367\" height=\"76\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-9-Add-Two-Digit-Numbers-78.png 367w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-9-Add-Two-Digit-Numbers-78-300x62.png 300w\" sizes=\"(max-width: 367px) 100vw, 367px\" \/><br \/>\nAnswer:<br \/>\nThe first pencil is longer than the second pencil<br \/>\nFirst pencil is circled<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-31954\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.10.png\" alt=\"\" width=\"444\" height=\"104\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.10.png 444w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.10-300x70.png 300w\" sizes=\"(max-width: 444px) 100vw, 444px\" \/><\/p>\n<h3><a id=\"Add_Two_Digit_Numbers_Performance_Task\"><\/a>Add Two-Digit Numbers Performance Task<\/h3>\n<p>Question 1.<br \/>\nYou play a game. Each red ball you collect is worth 10 points. Each yellow ball you collect is worth 1 point.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27820\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-9-Add-Two-Digit-Numbers-79.png\" alt=\"Big Ideas Math Answers Grade 1 Chapter 9 Add Two-Digit Numbers 79\" width=\"235\" height=\"210\" \/><\/p>\n<p>a. You collect 3 red balls and 13 yellow balls. How many points do you have?<\/p>\n<p>___________ points<br \/>\nAnswer: 30<\/p>\n<p>Explanation<br \/>\nRed ball = 10<br \/>\nyellow = 1.<br \/>\nI have collected 3 red and 13 yellow,<br \/>\n3 \u00d7 10 = 30<\/p>\n<p>39 + 13 = 52. Total points are 52.<\/p>\n<p>b. Your teammates score 38 points and 24 points. How many points do your teammates have in all?<\/p>\n<p>___________ points<br \/>\nAnswer:<br \/>\n38 + 24 = 62,<br \/>\n62 points our teammates have in all.<\/p>\n<p>c. Your learn wants to have 100 points. Does your team reach its goal?<\/p>\n<p>Yes No<br \/>\nAnswer: No,<br \/>\nwe didn&#8217;t reach the goal.<\/p>\n<p>d. Why do you think a red ball is worth more points?<br \/>\nAnswer:<br \/>\nBecause it is small in size and easy to handle to kids by seeing in the figure.<\/p>\n<h3><a id=\"Add_Two_Digit_Numbers_Change_Practice\"><\/a>Add Two-Digit Numbers Change Practice<\/h3>\n<h3>Add Tens and Ones Homework &amp; Practice 9.1<\/h3>\n<p>Question 1.<br \/>\n56 + 3 = _________<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27840\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Solutions-Grade-1-Chapter-9-Add-Two-Digit-Numbers-80.png\" alt=\"Big Ideas Math Solutions Grade 1 Chapter 9 Add Two-Digit Numbers 80\" width=\"183\" height=\"85\" \/><br \/>\nAnswer:<br \/>\n53 + 3 = 56,<br \/>\n5 tens and 6 ones.<\/p>\n<p>Question 2.<br \/>\n22 + 54 = __________<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27839\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Solutions-Grade-1-Chapter-9-Add-Two-Digit-Numbers-81.png\" alt=\"Big Ideas Math Solutions Grade 1 Chapter 9 Add Two-Digit Numbers 81\" width=\"197\" height=\"90\" \/><br \/>\nAnswer:<br \/>\n24 + 54 = 78,<br \/>\n7 tens and 8 ones.<\/p>\n<h3>Add Tens and Ones Using a Number Line Homework &amp; Practice 9.2<\/h3>\n<p>Question 3.<br \/>\n62 + 25 = ___________<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27838\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Solutions-Grade-1-Chapter-9-Add-Two-Digit-Numbers-82.png\" alt=\"Big Ideas Math Solutions Grade 1 Chapter 9 Add Two-Digit Numbers 82\" width=\"429\" height=\"28\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Solutions-Grade-1-Chapter-9-Add-Two-Digit-Numbers-82.png 429w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Solutions-Grade-1-Chapter-9-Add-Two-Digit-Numbers-82-300x20.png 300w\" sizes=\"(max-width: 429px) 100vw, 429px\" \/><br \/>\nAnswer: 62 + 25 = 87<\/p>\n<p>Explanation:<br \/>\n6 tens and 2 ones<br \/>\n2 tens and 5 ones<br \/>\nby adding both we get 87<\/p>\n<p>Question 4.<br \/>\n38 + 51 = ___________<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27838\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Solutions-Grade-1-Chapter-9-Add-Two-Digit-Numbers-82.png\" alt=\"Big Ideas Math Solutions Grade 1 Chapter 9 Add Two-Digit Numbers 82\" width=\"429\" height=\"28\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Solutions-Grade-1-Chapter-9-Add-Two-Digit-Numbers-82.png 429w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Solutions-Grade-1-Chapter-9-Add-Two-Digit-Numbers-82-300x20.png 300w\" sizes=\"(max-width: 429px) 100vw, 429px\" \/><br \/>\nAnswer: 38 + 51 = 89<\/p>\n<p>Explanation:<br \/>\n3 tens and 8 ones<br \/>\n5 tens and 1 ones<br \/>\nby adding both we get 89.<\/p>\n<p>Question 5.<br \/>\n<strong>MP Structure<\/strong><br \/>\nWrite an equation that matches the number line.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27837\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Solutions-Grade-1-Chapter-9-Add-Two-Digit-Numbers-83.png\" alt=\"Big Ideas Math Solutions Grade 1 Chapter 9 Add Two-Digit Numbers 83\" width=\"426\" height=\"128\" srcset=\"https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Solutions-Grade-1-Chapter-9-Add-Two-Digit-Numbers-83.png 426w, https:\/\/bigideasmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Solutions-Grade-1-Chapter-9-Add-Two-Digit-Numbers-83-300x90.png 300w\" sizes=\"(max-width: 426px) 100vw, 426px\" \/><br \/>\nAnswer: 16 + 52 = 68<\/p>\n<h3>Make a 10 to Add Homework &amp; Practice 9.3<\/h3>\n<p>Question 6.<br \/>\n42 + 6 = ___________<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27836\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Solutions-Grade-1-Chapter-9-Add-Two-Digit-Numbers-84.png\" alt=\"Big Ideas Math Solutions Grade 1 Chapter 9 Add Two-Digit Numbers 84\" width=\"173\" height=\"87\" \/><br \/>\nMake a 10?\u00a0 \u00a0 \u00a0 \u00a0Yes\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0No<br \/>\nAnswer: No<\/p>\n<p>Explanation:<br \/>\nlines represents the tens and circles represents the ones<br \/>\n4 tens and 2 ones<br \/>\n0 tens and 6 ones<br \/>\nBy adding ones place from both the sides 2 + 6 = 8<br \/>\nso there is no 10 in it.<\/p>\n<p>Question 7.<br \/>\n27 + 7 = ___________<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27835\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Solutions-Grade-1-Chapter-9-Add-Two-Digit-Numbers-85.png\" alt=\"Big Ideas Math Solutions Grade 1 Chapter 9 Add Two-Digit Numbers 85\" width=\"156\" height=\"83\" \/><br \/>\nMake a 10?\u00a0 \u00a0 \u00a0 \u00a0Yes\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0No<br \/>\nAnswer: yes<\/p>\n<p>Explanation:<br \/>\nlines represents the tens and circles represents the ones<br \/>\n2 tens and 7 ones<br \/>\n0 tens and 7 ones<br \/>\nBy adding ones place from both the sides 7 + 7 = 14<br \/>\nso there is 10 in it<\/p>\n<p><strong>MP Logic<\/strong><br \/>\nComplete.<br \/>\nQuestion 8.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27834\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Solutions-Grade-1-Chapter-9-Add-Two-Digit-Numbers-86.png\" alt=\"Big Ideas Math Solutions Grade 1 Chapter 9 Add Two-Digit Numbers 86\" width=\"167\" height=\"173\" \/><br \/>\nAnswer:<br \/>\n34 + 7 = 41.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-31958\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.9-5.png\" alt=\"\" width=\"167\" height=\"173\" \/><\/p>\n<p>Question 9.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27833\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Solutions-Grade-1-Chapter-9-Add-Two-Digit-Numbers-87.png\" alt=\"Big Ideas Math Solutions Grade 1 Chapter 9 Add Two-Digit Numbers 87\" width=\"163\" height=\"176\" \/><br \/>\nAnswer:<br \/>\n59 + 8 = 67<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-31959\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.9-6.png\" alt=\"\" width=\"167\" height=\"176\" \/><\/p>\n<h3>Add Two-Digit Numbers Homework &amp; Practice 9.4<\/h3>\n<p>Make quick sketches to find the sum.<\/p>\n<p>Question 10.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27832\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Solutions-Grade-1-Chapter-9-Add-Two-Digit-Numbers-88.png\" alt=\"Big Ideas Math Solutions Grade 1 Chapter 9 Add Two-Digit Numbers 88\" width=\"236\" height=\"246\" \/><br \/>\nAnswer:<br \/>\n28 + 33 = 61, 6 tens and 1 ones.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-31957\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.9-4.png\" alt=\"\" width=\"236\" height=\"246\" \/><\/p>\n<p>Question 11.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27831\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Solutions-Grade-1-Chapter-9-Add-Two-Digit-Numbers-89.png\" alt=\"Big Ideas Math Solutions Grade 1 Chapter 9 Add Two-Digit Numbers 89\" width=\"230\" height=\"157\" \/><\/p>\n<p>____________ tens ___________ one<br \/>\nAnswer:<br \/>\n49 + 24 =73, 7 tens and 3 ones.<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-31956\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-ideas-math-grade-1-addition-of-two-digit-numbers-chapter-9.9-3.png\" alt=\"\" width=\"230\" height=\"157\" \/><\/p>\n<p>Question 12.<br \/>\n<strong>Modeling Real Life<\/strong><br \/>\nYour club earns a badge for every 10 trees planted. Your club plants 25 trees in the fall and 25 in the spring. How many badges does your club earn?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27830\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Solutions-Grade-1-Chapter-9-Add-Two-Digit-Numbers-90.png\" alt=\"Big Ideas Math Solutions Grade 1 Chapter 9 Add Two-Digit Numbers 90\" width=\"126\" height=\"203\" \/><\/p>\n<p>_______________ badges<br \/>\nAnswer:<br \/>\nOne badge for 10, 25 in spring and 25 in fall.<br \/>\nTotal trees planted is 25 + 25 = 50.<br \/>\nSo, 5 badges.<\/p>\n<h3>Practice Addition Strategies Homework &amp; Practice 9.5<\/h3>\n<p>Question 13.<br \/>\n19 + 43 = __________<br \/>\nAnswer: 19 + 43 = 62, 6 tens and 2 ones.<\/p>\n<p>Question 14.<br \/>\n66 + 28 = __________<br \/>\nAnswer: 66 + 28 = 94, 9 tens and 4 ones.<\/p>\n<h3>Problem Solving: Addition Homework &amp; Practice 9.6<\/h3>\n<p>Question 15.<br \/>\nYour friend has 5 marbles. You have 23 more than your friend. How many marbles do you have?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27829\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Solutions-Grade-1-Chapter-9-Add-Two-Digit-Numbers-91.png\" alt=\"Big Ideas Math Solutions Grade 1 Chapter 9 Add Two-Digit Numbers 91\" width=\"67\" height=\"63\" \/><\/p>\n<p>_______________ marbles<br \/>\nAnswer:\u00a0 28 marbles<\/p>\n<p>Explanation<br \/>\nMy friend has 5 and me having 23 more<br \/>\nthan my friend 23 + 5 = 28.<\/p>\n<p>Question 16.<br \/>\n<strong>Modeling Real Life<\/strong><br \/>\nYou need 50 party hats. You have 24. You buy 16 more. Do you have enough party hats?<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-27828\" src=\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Solutions-Grade-1-Chapter-9-Add-Two-Digit-Numbers-92.png\" alt=\"Big Ideas Math Solutions Grade 1 Chapter 9 Add Two-Digit Numbers 92\" width=\"67\" height=\"109\" \/><\/p>\n<p>Yes\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0No<br \/>\nAnswer: No<\/p>\n<p>Explanation:<br \/>\nMe having 24 caps and bought 16 more<br \/>\n24 + 16 = 40,<br \/>\nNo, I don&#8217;t have enough caps.<\/p>\n<p><em>Conclusion:<\/em><\/p>\n<p>Download Big Ideas Math Answers Grade 1 Chapter 9 Add Two-Digit Numbers pdf and start your preparation for the exams. Big Ideas Math Answer is the best platform for the students to improve their math skills. If you have any queries about Big Ideas Math Answers Grade 1 Chapters you can post the comments in the below comment box. All the Best!!<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Get the free pdf link to Download Big Ideas Math Answers Grade 1 Chapter 9 Add Two-Digit Numbers from here. This Big Ideas Math Book 1st Grade Answer Key Chapter 9 Add Two-Digit Numbers was designed by subject experts to assist the primary school students. 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