Big Ideas Math Book 1st Grade Answer Key Chapter 2 Fluency and Strategies within 10<\/h2>\n
The quiz, homework, formative assessment, or just extra practice whatever you wish to solve can easily do using Bigideas Math Solution Key Grade 1 Chapter 2 Fluency and Strategies within 10. Improve problem-solving capacity by using Big Ideas Math Answer Grade 1. Just click on the below links and gain knowledge on this chapter.<\/p>\n
Vocabulary<\/strong><\/p>\n Lesson 1: Add 0<\/strong><\/p>\n Lesson 2 Subtract 0 and Subtract All<\/strong><\/p>\n Lesson 3: Add and Subtract 1<\/strong><\/p>\n Lesson 4: Add Doubles from 1 to 5<\/strong><\/p>\n Lesson 5: Use Doubles<\/strong><\/p>\n Lesson 6: Add in Any Order<\/strong><\/p>\n Lesson 7: Count on to Add<\/strong><\/p>\n Lesson 8: Count Back to Subtract<\/strong><\/p>\n Lesson 9: Use Addition to Subtract<\/strong><\/p>\n Performance Task<\/strong><\/p>\n Organize It<\/strong><\/p>\n Review words: Use the review words to complete the graphic organizer.<\/p>\n Question 1. Question 2. Define It<\/strong><\/p>\n Use your vocabulary cards to match.<\/p>\n Explanation: Explore and Grow<\/strong><\/p>\n Use linking cubes to model each story.<\/p>\n There are 6 ducks in the pond. 0 ducks join them. How many ducks are in the pond flow?<\/p>\n ____ ducks<\/p>\n Answer: Show and Grow<\/strong><\/p>\n Use the picture to write an equation.<\/p>\n Question 1. Explanation: Question 2. Question 3. Question 4. Apply and Grow: Practice<\/strong><\/p>\n Use the picture to write an equation.<\/p>\n Question 5. Question 6. Question 7. Question 8. DIG DEEPER! Question 9. Question 10. Question 11. Think and Grow: Modeling Real Life<\/strong><\/p>\n There are no students at a bus stop. Then 9 students arrive. How many students are at the bus stop now? _________ students Show and Grow<\/strong><\/p>\n Question 12. __________ tokens Use the picture to write an equation.<\/p>\n Question 1. Question 2. Question 3. Question 4. Question 5. Question 6. Question 7. Question 8. Question 9. __________ seals Review & Refresh<\/strong><\/p>\n Write the number of goldfish.<\/p>\n Question 10. Question 11. Question 12. Question 13. Explore and Grow<\/strong><\/p>\n Use linking cubes to model each story.<\/p>\n There are 5 beavers on the log. None of the beavers leave. How many beavers are left?<\/p>\n ________ beavers _________ beavers<\/p>\n Answer: Show and Grow<\/strong><\/p>\n Use the picture to write an equation.<\/p>\n Question 1. Question 2. Question 3. Question 4. Apply and Grow: Practice<\/strong><\/p>\n Use the picture to write an equation.<\/p>\n Question 5. Answer: Question 6. Question 7. Explanation: Question 8. Question 9. Question 10. Question 11. Words: 4 – ______ = 4 Think and Grow: Modeling Real Life<\/p>\n Your friend has 7 pennies. You have 7 fewer pennies than your friend. How many do you have? Subtraction equation:<\/p>\n _________ pennies Show and Grow<\/strong><\/p>\n Question 12. Subtraction equation:<\/p>\n _________ pieces of chalk Use the picture to write an equation.<\/p>\n Question 1. Question 2. Question 3. Question 4. Question 5. Question 6. Question 7. Words: 9 – ______ = 0 Answer: Question 8. ________ stuffed animals<\/p>\n Answer: Review & Refresh<\/strong><\/p>\n Write the number of dots you see on each domino. Then write the numbers in order.<\/p>\n Question 9. Question 10. Explore and Grow<\/strong><\/p>\n Use linking cubes to model each story.<\/p>\n There are 7 kids on the bench. 1 kid joins them. How many kids are on the bench flow? Answer: Answer: Show and Grow<\/strong><\/p>\n Use the picture to write an equation.<\/p>\n Question 1. Question 2. Apply and Grow: Practice<\/strong><\/p>\n Use the picture to write an equation.<\/p>\n Question 3. Question 4. Question 5. Question 6. Question 7. Question 8. DIG DEEPER!<\/strong> Question 10. Question 11. Think and Grow: Modeling Real Life<\/strong><\/p>\n You have 9 action figures. Newton has 1 more than you. Descartes has 1 fewer than you. Who has more, Newton or Descartes? Equations:\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Newton\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Descartes<\/p>\n Who has more\u00a0 \u00a0 Newton\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Descartes Show and Grow<\/strong><\/p>\n Question 12. Who has fewer?\u00a0 \u00a0 Newton\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Descartes Use the picture to write an equation.<\/p>\n Question 1. Question 2.<\/p>\n ___________ – ___________ = ___________ Question 3. Question 4. DIG DEEPER!<\/strong> Question 6. Question 7. Question 8. Review & Refresh<\/strong><\/p>\n Question 9. Explore and Grow<\/strong><\/p>\n Use counters to model the story.<\/p>\n You have 3 balls. Your friend has 3 balls. How many balls are there in all? Show and Grow<\/strong><\/p>\n Question 1. Question 2. Question 3. Question 4. Apply and grow: Practice<\/strong><\/p>\n Question 5. Question 6. Question 7. Question 8. Question 9. Question 10. Question 11. ________ + ________ =\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a09 ________ + ________ = 2 Think and Grow: Modeling Real Life<\/strong><\/p>\n You and your friend color the same number of pictures. There are to pictures in all. How many pictures do you each color? Addition equation:<\/p>\n __________ pictures<\/p>\n Show and Grow<\/p>\n Question 12. Addition equation:<\/p>\n ________ flowers Question 1. Question 2. Explanation: Question 3. Question 4. Question 5. Question 6. Question 7. _________ + _________ = 4\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 _________ + _________ = 7 Question 8. <\/p>\n ________ linking cubes Review & Refresh<\/strong><\/p>\n Use the picture to write an equation.<\/p>\n Question 9. Question 10. Explore and Grow<\/strong><\/p>\n Use counters to model the story.<\/p>\n You collect 4 shells. Your friend collects 4 shells. How many shells are there in all?<\/p>\n ____ shells<\/p>\n Answer: You collect 4 shells. Your friend collects 5 shells. How many shells are there in all?<\/p>\n <\/p>\n ____ shells Show and Grow<\/p>\n Use the double 3 + 3 to find each sum.<\/p>\n Question 1. Apply and Grow: Practice<\/strong><\/p>\n Use the double 2 + 2 to find each sum.<\/p>\n Question 2. 2 + 1 = ______ Find the sum. Write the double you used.<\/p>\n Question 3. Question 4. Question 5. Think and Grow: Modeling Real Life<\/strong><\/p>\n You eat 4 grapes. Your friend eats I more than you. How many grapes do you and your friend eat in all? __________ grapes Show and Grow<\/strong><\/p>\n Question 6. Which doubles can you use to find the sum? <\/p>\n _________ toy cars Use the double 4 + 4 to find each sum.<\/p>\n Question 1. 4 + 3 = _______ Find the sum. Write the double you used.<\/p>\n Question 2. Question 3. Question 4. Question 5. <\/p>\n _________ butterflies Review & Refresh<\/strong><\/p>\n Question 6. Explore and Grow<\/strong><\/p>\n Use counters to model each problem. What do you notice?<\/p>\n 4 + 3 = ____7_____<\/p>\n 3 + 4 = ___7______<\/p>\n Show and Grow<\/strong><\/p>\n Question 1. Question 2.Whatever may be the order of addends the sum is always the same.<\/span> Question 3. 2 + 3 = 5 Explanation: Apply and Grow: Practice<\/strong><\/p>\n Question 4. Find the sum. Then change the order of the addends. Write the new addition problem.<\/p>\n Question 5. Question 6. Explanation: Question 7. Question 8. Question 9. Think and Grow: Modeling Real Life<\/strong><\/p>\n You have 7 shirts. 3 are green. The rest are blue. How many blue shirts do you have? You have ____ blue shirts. Show and Grow<\/strong><\/p>\n Question 10. You have ____ red cups. Question 1. Question 2. Find the sum. Then change the order of the addends. Write the new addition problem.<\/p>\n Question 3. Question 4. Question 5. Question 6. You have _______ yellow tomatoes. Review & Refresh<\/strong><\/p>\n Use the ten frame to complete the equation.<\/p>\n Question 7. Question 8. Explore and Grow<\/strong><\/p>\n Model the story.<\/p>\n There are 5 coins in a piggy bank. You put in 2 more. How many coins are in the bank now?<\/p>\n Show and Grow<\/strong><\/p>\n Question 1. Question 2. Question 3. Question 4. Explanation: Apply and Grow: practice<\/strong><\/p>\n Question 5. Question 6. Question 7. Question 8. Question 9. Question 10. Question 11. Think and Grow: Modeling Real Life<\/strong><\/p>\n You and your friend are on a scavenger hunt. You find 3 clues. You and your friend find 8 clues in all. How many clues does your friend find? ______ clues Show and Grow<\/strong><\/p>\n Question 12. ________ cans Question 1. Question 2. Question 3. Question 4. Question 5. Explanation: Question 6. Question 7. Question 8. <\/p>\n __________ coins Review & Refresh<\/strong><\/p>\n Use the picture to write an equation.<\/p>\n Question 9. Question 10. Explore and Grow<\/strong><\/p>\n Model the story.<\/p>\n There are 8 students in a line. 2 of them leave. How many students are left? Show and Grow<\/strong><\/p>\n Question 1. Question 2. Question 3. Question 4. Apply and Grow: Practice<\/strong><\/p>\n Question 5. Question 6. Question 7. Question 8. Explanation: Question 9. Question 10. Question 11.\n
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<\/a>Fluency and Strategies within 10 Vocabulary<\/h3>\n
\naddend
\nsum
\ndifference<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-1.png\")
\nAnswer:
\n![\"Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10Fluency-Strategies-within-10-Vocabulary-Question-1\"](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10Fluency-Strategies-within-10-Vocabulary-Question-1.jpg\")
\nExplanation:
\nA number that is added to another number is known as an addend.
\nIn this case, 3 and 4 are the addends.
\nSum is the result of adding two numbers.
\nSo, 3 + 4 = 7
\n7 is the result that means sum.<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-2.png\")
\nAnswer:
\n![\"Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10Fluency-Strategies-within-10-Vocabulary-Question-2\"](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10Fluency-Strategies-within-10-Vocabulary-Question-2.jpg\")
<\/p>\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-3.png\")
\nAnswer:
\n![\"Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10Fluency-Strategies-within-10-Vocabulary-Define-it\"](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10Fluency-Strategies-within-10-Vocabulary-Define-it.jpg\")
<\/p>\n
\nA number line can be defined as a straight line with numbers placed at equal intervals or segments along its length. A number line can be extended infinitely in any direction and is usually represented horizontally.
\nCount on is nothing the count that goes forward.
\nCount back is nothing but count that goes backward.<\/p>\n<\/a>Lesson 2.1 Add 0<\/h3>\n
\nNumber of ducks in pond = 6
\nNumber of ducks joined= 0
\nTotal number of ducks= 6+0=6 Ducks<\/p>\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-4-1.png\")
\nAnswer:
\nNumber of ducks in pond = 0
\nNumber of ducks joined= 8
\nTotal number of ducks= 0+8=8 ducks<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-5.png\")
\nAnswer:
\n4 + 0 = 4<\/p>\n
\nBy seeing the above picture we say that one of the addend is 4 and another addend is 0.
\nNow add both the numbers
\n4 + 0 = 4
\nThus the result is 4.<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-6.png\")
\nAnswer:
\n0 + 1=1
\nExplanation:
\nFrom the above figure we notice 0 and 1 are addends . Adding 0 to any number gives the sum as the number itself. Now add both the numbers
\n0 + 1 = 1
\nThus the result is 1.<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-7.png\")
\nAnswer:
\n0 + 6 = 6
\nExplanation:
\nFrom the above figure we notice 0 and 6 are addends . Adding 0 to any number gives the sum as the number itself. Now add both the numbers
\n0 + 6 = 6
\nThus the result is 6<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-8.png\")
\nAnswer:
\n8 + 0 = 8
\nExplanation:
\nFrom the above figure we notice 0 and 8 are addends . Adding 0 to any number gives the sum as the number itself. Now add both the numbers
\n8 + 0 = 8
\nThus the result is 8.<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-9.png\")
\nAnswer:
\n7 + 0 = 7
\nExplanation:
\nFrom the above figure we notice 0 and 7 are addends . Adding 0 to any number gives the sum as the number itself. Now add both the numbers
\n7 + 0= 7
\nThus the result is 7.<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-10.png\")
\nAnswer:
\n0 + 10 = 10
\nExplanation:
\nFrom the above figure we notice 0 and 10 are addends . Adding 0 to any number gives the sum as the number itself. Now add both the numbers
\n0 + 10 = 10
\nThus the result is 10.<\/p>\n
\n9 + 0 = _____
\nAnswer:
\n9 + 0 = 9
\nExplanation:
\nFrom the above figure we notice 0 and 9 are addends . Adding 0 to any number gives the sum as the number itself. Now add both the numbers
\n9 + 0 = 9
\nThus the result is 9.<\/p>\n
\n0 + 8 = ______
\nAnswer:
\n0 + 8 = 8
\nExplanation:
\nFrom the above figure we notice 0 and 8 are addends . Adding 0 to any number gives the sum as the number itself. Now add both the numbers
\n0 + 8 = 8
\nThus the result is 8.<\/p>\n
\n<\/strong>Find each sum. Think: What do you notice?<\/p>\n
\n3 + 0 = ______
\n0 + 3 = ______
\nAnswer:
\n3 + 0 = 3
\n0 + 3 = 3
\nWe notice that any number added with 0 will be the same number.<\/p>\n
\n0 + 6 = ______
\n6 + 0 = ______
\nAnswer:
\n0 + 6 = 6
\n6 + 0 = 6
\nWe notice that any number added with 0 will be the same number.<\/p>\n
\nMP Logic
\nThere are 7 penguins in all. How many penguins are inside the igloo?
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-11.png\")
\nAnswer:
\nTotal Number of penguins = 7
\nNumber of penguins outside = 7
\nNumber of penguins inside = x
\nx + 7 = 7
\nx = 0<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-12.png\")
\nModel:
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-13.png\")
\nAddition equation:<\/p>\n
\nAnswer:
\n![\"Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Lesson-2.1-Add-0-Think-Grow\"](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Lesson-2.1-Add-0-Think-Grow.jpg\")
\n0 + 9 = 9
\nNumber of students at bus stop = 9 students
\nExplanation:
\nFrom the above figure we notice 0 and 9 are addends . Adding 0 to any number gives the sum as the number itself. Now add both the numbers
\n0 + 9 = 9
\nThus the result is 9.<\/p>\n
\nYour friend does not have any tokens. You give your friend 7 tokens. How many tokens does your friend have now?
\nModel:
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-14.png\")
\nAddition equation:<\/p>\n
\nAnswer:
\n![\"Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Lesson-2.1-Add-0-Show-Grow-Question-12\"](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Lesson-2.1-Add-0-Show-Grow-Question-12.jpg\")
\n0 + 7 = 7
\nNumber of tokens with my friend = 7 tokens
\nExplanation:
\nFrom the above figure we notice 0 and 7 are addends . Adding 0 to any number gives the sum as the number itself. Now add both the numbers
\n0 + 7 = 7
\nThus the result is 7.<\/p>\n<\/a>Add 0 Practice 2.1<\/h3>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-15.png\")
\n________ + 0 = _________
\nAnswer:
\n9 + 0 = 9
\nExplanation:
\nFrom the above figure we notice 0 and 9 are addends . Adding 0 to any number gives the sum as the number itself. Now add both the numbers
\n9 + 0 = 9
\nThus the result is 9.<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-16.png\")
\n________ + 0 = _________
\nAnswer:
\n0 + 3 = 3
\nExplanation:
\nFrom the above figure we notice 0 and 3 are addends . Adding 0 to any number gives the sum as the number itself. Now add both the numbers
\n0 + 3 = 3
\nThus the result is 3<\/p>\n
\n10 + 0 = ________
\nAnswer:
\n10 + 0 = 10
\nExplanation:
\nFrom the above figure we notice 0 and 10 are addends . Adding 0 to any number gives the sum as the number itself. Now add both the numbers
\n10 + 0 = 10
\nThus the result is 10.<\/p>\n
\n0 + 5 = _______
\nAnswer:
\n0 + 5 = 5
\nExplanation:
\nFrom the above figure we notice 0 and 5 are addends . Adding 0 to any number gives the sum as the number itself. Now add both the numbers
\n0 + 5 = 5
\nThus the result is 5.<\/p>\n
\n0 + 6 = _______
\nAnswer:
\n0 + 6 = 6
\nExplanation:
\nFrom the above figure we notice 0 and 6 are addends . Adding 0 to any number gives the sum as the number itself. Now add both the numbers
\n0 + 6 = 6
\nThus the result is 6.<\/p>\n
\n0 + 0 = _______
\nAnswer:
\n0 + 0 =0
\nExplanation:
\nFrom the above figure we notice 0 are addends . Adding 0 to any number gives the sum as the number itself. Now add both the numbers
\n0 + 0 = 0
\nThus the result is 0.<\/p>\n
\nDIG DEEPER!<\/strong>
\nFind each sum. Think: What do you notice?
\n7 + 0 = ______
\n0 + 7 = ______
\nAnswer:
\n7 + 0 = 7
\n0 + 7 = 7
\nExplanation:
\nFrom the above figure we notice 0 and 1 are addends . Adding 0 to any number gives the sum as the number itself. If the\u00a0order\u00a0of the\u00a0addends changes, the\u00a0sum\u00a0stays the same.Now add both the numbers
\n0 + 1 = 1
\nThus the result is 1.<\/p>\n
\nMP Logic<\/strong>
\nThere are 8 students in all. How many students are inside the museum?
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-17.png\")
\nAnswer:
\nNumber of students = 8
\nNumber of students out side the museum= 8
\nNumber of students inside the museum=\u00a0 x
\nx + 8 = 8
\nx = 0
\nNumber of students inside the museum = 0<\/p>\n
\nModeling Real Life<\/strong>
\nThere are no seals on the shore. Then 10 seals swim to the shore. How many seals are on the shore now?
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-18.png\")
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-19.png\")
<\/p>\n
\nAnswer:
\n![\"Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Add-0-Practice-2.1-Question-9\"](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Add-0-Practice-2.1-Question-9.jpg\")
\n0 + 10 = 10
\nNumber of seals on the shore = 0 + 10 = 10 seals
\nExplanation:
\nFrom the above figure we notice 0 and 10 are addends . Adding 0 to any number gives the sum as the number itself. Now add both the numbers
\n0 + 10 = 10
\nThus the result is 10.<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-20.png\")
\nAnswer:
\n1
\nExplanation:
\nAs per above figure we notice only 1 goldfishes in the aquarium.<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-21.png\")
\nAnswer:
\n3
\nExplanation:
\nAs per above figure we notice 3 goldfishes in the aquarium.<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-22.png\")
\nAnswer:
\n0
\nExplanation:
\nAs per above figure we notice no goldfish in the aquarium.<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-23.png\")
\nAnswer:
\n2
\nExplanation:
\nAs per above figure we notice 2 goldfishes in the aquarium.<\/p>\n<\/a>Lesson 2.2 Subtract 0 and Subtract All<\/h3>\n
\nAnswer:
\nNumber of beavers = 5
\nNumber of beavers leave= 0
\nNumber of beavers Remaining = 5 – 0 = 5<\/p>\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-24.png\")
\nThere are 5 beavers on the log. All of the beavers leave. How many beavers are left?<\/p>\n
\nNumber of beavers = 5
\nNumber of beavers left = 5
\nNumber of beavers remaining =5 – 5 = 0<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-25.png\")
\n_________ – 0 = ________
\nAnswer:
\n2 – 0\u00a0 = 2
\nExplanation:
\nFrom the above equation we notice 2 is minuend and 0 is subtrahend. Subtracting 0 from any number gives the number itself as the difference. Now subtract the 2 and 0
\n2 – 0 = 2
\nThus the difference is 2<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-26.png\")
\n_________ – _________ = 0
\nAnswer:
\n1 – 1 = 0
\nExplanation:
\nWhen a\u00a0number\u00a0is\u00a0subtracted from itself\u00a0the difference is always equal to 0.
\nThus the difference is 0<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-27.png\")
\n_________ – 0 = _________
\nAnswer:
\n4 – 0 = 4
\nExplanation:
\nFrom the above equation we notice 4 is minuend and 0 is subtrahend. Subtracting 0 from any number gives the number itself as the difference. Now subtract the 4 and 0
\n4 – 0 = 4
\nThus the difference is 4<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-28.png\")
\n_________ – _________ = 0
\nAnswer:
\n2 – 2 = 0
\nExplanation:
\nWhen a\u00a0number\u00a0is\u00a0subtracted from itself\u00a0the difference is always equal to 0.
\nThus the difference is 0<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-29.png\")
\n_________ – 0 = _________<\/p>\n
\n8 – 0 = 8
\nExplanation:
\nFrom the above equation we notice 8 is minuend and 0 is subtrahend. Subtracting 0 from any number gives the number itself as the difference. Now subtract the 2 and 0
\n8 – 0 = 8
\nThus the difference is 8<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-30.png\")
\n_________ – _________ = 0
\nAnswer:
\n8 – 8 = 0
\nExplanation:
\nWhen a\u00a0number\u00a0is\u00a0subtracted from itself\u00a0the difference is always equal to 0.
\nThus the difference is 0<\/p>\n
\n5 – 5 = _______
\nAnswer:
\n5 – 5 = 0<\/p>\n
\nWhen a\u00a0number\u00a0is\u00a0subtracted from itself\u00a0the difference is always equal to 0.
\nThus the difference is 0<\/p>\n
\n6 – 0 = ________
\nAnswer:
\n6 – 0 = 6
\nExplanation:
\nFrom the above equation we notice 6 is minuend and 0 is subtrahend Subtracting 0 from any number gives the number itself as the difference. Now subtract the 6 and 0
\n6 – 0 = 6
\nThus the difference is 6<\/p>\n
\n9 – 0 = ________
\nAnswer:
\n9 – 0 = 9
\nExplanation:
\nFrom the above equation we notice 9 is minuend and 0 is subtrahend Subtracting 0 from any number gives the number itself as the difference. Now subtract the 9 and 0
\n9 – 0 = 9
\nThus the difference is 9<\/p>\n
\n7 – 7 = ________
\nAnswer:
\n7 – 7 = 0
\nExplanation:
\nWhen a\u00a0number\u00a0is\u00a0subtracted from itself\u00a0the difference is always equal to 0.
\nThus the difference is 0<\/p>\n
\nMP Structure<\/strong>
\nComplete the equation. Then use the words to complete the sentence.<\/p>\n
\ndifference
\nnumber
\nsubtract<\/p>\n
\nWhen you ______ 0 from a number,\u00a0 the ______ is that ______ .
\nAnswer:
\n4 – 0 = 4
\nWhen you subtract 0 from a number,\u00a0 the number is that difference.<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-31.png\")
\nDraw a picture:<\/p>\n
\nAnswer:
\n![\"Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Lesson](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Lesson-2.2-Subtract-0-Subtract-All-Think-Grow-Modeling-Real-Life.jpg\")
\nNumber of pennies with my friend = 7
\nNumber of pennies with me\u00a0 = x
\nx = 7 – 7 (7 fewer than my friend )
\nx = 0
\nNumber of pennies with me = 0<\/p>\n
\nYou have 6 pieces of chalk. You give all of your chalk to your friend. How many pieces do you have left?
\nDraw a picture:<\/p>\n
\nAnswer:
\n![\"Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Lesson](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Lesson-2.2-Subtract-0-Subtract-All-Show-Grow-Question-12.jpg\")
\nNumber of chalks with me = 6
\nNumber of chalks given to my friend = 6
\nNumber of chalks remaining with me = 6 – 6 = 0<\/p>\n<\/a>Subtract 0 and Subtract All Practice 2.2<\/h3>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-32.png\")
\n________ – 0 = ________
\nAnswer:
\n5 – 0 = 5<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-33.png\")
\n________ – _______ = 0
\nAnswer:
\n5 – 5 = 0
\nExplanation:
\nWhen a\u00a0number\u00a0is\u00a0subtracted from itself\u00a0the difference is always equal to 0.
\nThus the difference is 0<\/p>\n
\n3 – 3 = _______
\nAnswer:
\n3 – 3 = 0
\nExplanation:
\nWhen a\u00a0number\u00a0is\u00a0subtracted from itself\u00a0the difference is always equal to 0.
\nThus the difference is 0<\/p>\n
\n1 – 0 = _________
\nAnswer:
\n1 – 0 = 1<\/p>\n
\n1 – 1= _________
\nAnswer:
\n1 – 1= 0
\nExplanation:
\nWhen a\u00a0number\u00a0is\u00a0subtracted from itself\u00a0the difference is always equal to 0.
\nThus the difference is 0<\/p>\n
\n7 – 0 = _________
\nAnswer:
\n7 – 0 = 7<\/p>\n
\nMP Structure<\/strong>
\nComplete the equation. Then use the words to complete the sentence.<\/p>\n
\ndifference
\nnumber
\nsubtract<\/p>\n
\nWhen you ______ a ______ from itself, the ______________ is 0.<\/p>\n
\n9 – 9 = 0
\nWhen you subtract a number from itself, the difference is 0<\/p>\n
\nModeling Real Life You have 4 stuffed animals. You give all of them to your friend. How many stuffed animals do you have left?
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-34.png\")
<\/p>\n
\nNumber of stuffed animals\u00a0 with me = 4
\nNumber of stuffed animals given to my friend= 4
\nNumber of stuffed animals remaining = 4 – 4 = 0<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-35.png\")
\nAnswer:
\n![\"Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Subtract-0-Subtract-All-Practice-2.2-Question-9\"](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Subtract-0-Subtract-All-Practice-2.2-Question-9.jpg\")
<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-36.png\")
\nAnswer:
\n![\"Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Subtract-0-Subtract-All-Practice-2.2-Question-10\"](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Subtract-0-Subtract-All-Practice-2.2-Question-10.jpg\")
<\/p>\n<\/a>Lesson 2.3 Add and Subtract 1<\/h3>\n
\n__________ kids<\/p>\n
\nNumber of kids = 7
\nNumber of kids joined = 1
\nTotal number of kids = 7 + 1 = 8
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Solutions-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-37.png\")
\nThere are 8 kids on the bench. 1 kid leaves. How many kids are left?
\n__________ kids<\/p>\n
\nNumber of kids = 8
\nNumber of kids left = 1
\nTotal number of kids = 8 – 1 = 7<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Solutions-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-38.png\")
\n___________ – __________ = ___________
\nAnswer:
\n7 – 1 = 6
\nExplanation:
\nFrom the above figure, we notice six people are playing and one person is leaving . so we get equation as
\n6 + 1 = 7 .
\nIn Total we notice 7 people in the picture .<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Solutions-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-39.png\")
\n___________ + __________ = ___________
\nAnswer:
\n7 + 1 = 8
\nExplanation:
\nFrom the above figure, we notice 7 people are playing and 1 person is joining. so we get equation as
\n7 + 1 = 8 .
\nIn Total we notice 8 people in the picture .<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Solutions-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-40.png\")
\n___________ + __________ = ___________
\nAnswer:
\n9 + 1 = 10
\nExplanation:
\nFrom the above picture we notice 9 people in the pool and 1 person is joining the pool. so total number of people in pool is 9 + 1 = 10 .
\nThus Total people in the pool are 10 people.<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Solutions-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-41.png\")
\n___________ + __________ = ___________
\nAnswer:
\n8 + 1 = 9
\nExplanation:
\nFrom the above picture we notice 8 people in the pool and 1 person is leaving the pool. so total number of people in the picture is 8 + 1 = 9 .
\nThus Total people are 9 people.<\/p>\n
\n5 – 1 = ________
\nAnswer:
\n5 – 1 = 4
\nExplanation:
\nFrom the above equation we notice 5 is minuend and 1 is subtrahend.
\nNow subtract
\n5 – 1 = 4
\nThus the difference is 4<\/p>\n
\n6 + 1 = ________
\nAnswer:
\n6 + 1 = 7
\nExplanation:
\nFrom the above figure we notice 6 and 1 are addends .Now add both the numbers
\n6 + 1 = 7
\nTherefore the sum is 7.<\/p>\n
\n8 + 1 = ________
\nAnswer:
\n8 + 1 = 9
\nExplanation:
\nFrom the above figure we notice 8 and 1 are addends .Now add both the numbers
\n8 + 1 = 9
\nTherefore the sum is 9.<\/p>\n
\n7 – 1 = ________
\nAnswer:
\n7 – 1 = 6
\nExplanation:
\nFrom the above equation we notice 7 is minuend and 1 is subtrahend.
\nNow subtract
\n7 – 1 = 6
\nThus the difference is 6<\/p>\n
\nCircle the problem with the greater sum or difference.
\nQuestion 9.
\n2 – 1\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 2 + 1
\nAnswer:
\n![\"Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Lesson-2.3-Add-Subtract-1-Question-9\"](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Lesson-2.3-Add-Subtract-1-Question-9.jpg\")
\nExplanation:
\nfrom above equations we get
\n2 – 1 = 1 as difference and
\n2 + 1 = 3 as sum
\nnow compare difference and sum
\n1 < 3
\nTherefore , 3 is greater than 1<\/p>\n
\n5 + 1\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 6 – 1
\nAnswer:
\n![\"Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Lesson-2.3-Add-Subtract-1-Question-10\"](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Lesson-2.3-Add-Subtract-1-Question-10.jpg\")
\nExplanation:
\nfrom above equations we get
\n6 –\u00a0 1 = 5 as difference and
\n5 + 1 = 6 as sum
\nnow compare difference and sum
\n6 > 5
\nTherefore , 6 is greater than 5<\/p>\n
\nYOU BE THE TEACHER<\/strong>
\nCircle to show who is correct. Show how you know?![\"\"](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/23-59-12-Big-Ideas-Math-Solutions-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-42.png\")
\nAnswer:
\n![\"Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Lesson-2.3-Add-Subtract-1-Question-11\"](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Lesson-2.3-Add-Subtract-1-Question-11-1.jpg\")
\nExplanation:
\nwhen a given number\u00a0is increased by\u00a01\u00a0then we get the next\u00a0number\u00a0of that\u00a0number, Also, we know that a next\u00a0number\u00a0of a\u00a0number is called successor.
\nFrom the number line we can notice when 3 is added with 1 we get 4 as sum which is next number of 3.<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Solutions-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-43.png\")
<\/p>\n
\nAnswer:
\nNumber of action figures with me= 9
\nNumber of action figures with Newton = 9 + 1 = 10
\nNumber of action figures with Descartes = 9 – 1 = 8
\nNewton has 2 more action figures than Descartes.<\/p>\n
\nYou have 5 video games. Newton has 1 fewer than you. Descartes has 1 more than you. Who has fewer, Newton or Descartes?
\nEquations:\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Newton\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Descartes<\/p>\n
\nAnswer:
\nNumber of video games with me = 5
\nNumber of video games with Newton\u00a0 = 5 – 1 = 4
\nNumber of video games with Descartes = 5 + 1 = 6
\nNewton has 2 fewer than Descartes.<\/p>\n<\/a>Add and Subtract 1 Practice 2.3<\/h3>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Solutions-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-44.png\")
\n___________ + ___________ = ___________
\nAnswer:
\n5 + 1 = 6
\nExplanation:
\nFrom the above equation we notice 5 and 1 are addends .when a given number\u00a0is increased by\u00a01\u00a0then we get the next\u00a0number\u00a0of that\u00a0number as sum, next number of 5 is 6
\nNow add both the numbers
\n5 + 1 = 6
\nTherefore the sum is 6.<\/p>\n
\nAnswer:
\n5 – 1 = 4
\nExplanation:
\nwhen a number is reduced by 1, then we get the previous number of that number as difference.
\nprevious number of 5 is 4 .
\nTherefore difference = 4<\/p>\n
\n10 – 1 = ___________
\nAnswer:
\n10 – 1 = 9
\nExplanation:
\nwhen a number is reduced by 1, then we get the previous number of that number as difference.
\nprevious number of 10 is 9 .
\nTherefore difference = 9<\/p>\n
\n7 + 1 = ___________
\nAnswer:
\n7 + 1 = 8
\nExplanation:
\nFrom the above Equation we notice 7 and 1 are addends .when a given number is increased by 1 then we get the next number of that number as sum, next number of 7 is 8
\nNow add both the numbers
\n7 + 1 = 8
\nTherefore the sum is 8.<\/p>\n
\nCircle the problem with the greater sum or difference.
\nQuestion 5.
\n4 – 1 4 + 1
\nAnswer:
\n![\"Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Add-Subtract-1-Practice-2.3-Question-5\"](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Add-Subtract-1-Practice-2.3-Question-5.jpg\")
\nExplanation:
\nfrom above equations we get
\n4 – 1 = 3 as difference and
\n4 + 1 = 5 as sum
\nnow compare difference and sum
\n3 < 5
\nTherefore , 5 is greater than 3<\/p>\n
\n7 + 1 8 + 1
\nAnswer:
\n![\"Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Add-Subtract-1-Practice-2.3-Question-6\"](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Add-Subtract-1-Practice-2.3-Question-6.jpg\")
\nExplanation:
\nfrom above equations we get
\n7 + 1 = 8 as sum and
\n8 + 1 = 9 as sum
\nnow compare both the sums
\n8 < 9
\nTherefore , 9 is greater than 8<\/p>\n
\nYOU BE THE TEACHER<\/strong>
\nCircle to show who is correct. Show how you know.
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Solutions-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-46.png\")
\nAnswer:
\n![\"Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Add-Subtract-1-Practice-2.3-Question-7\"](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Add-Subtract-1-Practice-2.3-Question-7.jpg\")
\nExplanation:
\nwhen a number is reduced by 1, then we get the previous number of that number as difference.
\nprevious number of 6 is 5 .
\nTherefore difference = 5<\/p>\n
\nModeling Real Life
\nYou have 3 karate belts. Newton has I fewer than you. Descartes has I more than you. Who has fewer, Newton or Descartes?
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Solutions-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-47.png\")
\nWho has fewer?\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0Newton\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 Descartes
\nAnswer:
\nNumber of karate belts = 3
\nNumber of belts with Newton = 3 – 1 = 2
\nNumber of belts with Descartes = 3 + 1 = 4
\nNewton have 2 fewer belts than Descartes.<\/p>\n
\nUse the picture to complete the number bond.
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Solutions-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-48.png\")
\nAnswer:
\n![\"Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Add-Subtract-1-Practice-2.3-Question-9\"](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Add-Subtract-1-Practice-2.3-Question-9.jpg\")
<\/p>\n<\/a>Lesson 2.4 Add Doubles from 1 to 5<\/h3>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-49.png\")
\nAnswer:
\n![\"Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Lesson](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Lesson-2.4-Add-Doubles-from-1-to-5-Explore-Grow.jpg\")
\nExplanation:
\nHere we have 2 groups . each group contains 3 balls.
\nSo total number of groups = 2
\nTotal number of balls\u00a0 = 3 + 3 = 6<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-50.png\")
\n___________ – ___________ = ___________
\nAnswer:
\n4 – 4 = 0
\nExplanation:
\nWhen a\u00a0number\u00a0is\u00a0subtracted from itself\u00a0the difference is always equal to 0.
\nThus the difference is 0<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-51.png\")
\n___________ + ___________ = ___________
\nAnswer:
\n1 + 1 = 2
\nExplanation:
\nwhen a given number is increased by 1 then we get the next number of that number, Also, we know that a next number of a number is called successor.
\nThe next number of 1 is 2.<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-52.png\")
\nAnswer:
\n![\"Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Lesson](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Lesson-2.4-Add-Doubles-from-1-to-5-Show-Grow-Question-3.jpg\")
\nExplanation:
\nFrom the above figure we notice 4 are addends .Now add both the numbers
\n4 + 4 = 8
\nTherefore the sum is 8.<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-53.png\")
\nAnswer:
\n![\"Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Lesson](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Lesson-2.4-Add-Doubles-from-1-to-5-Show-Grow-Question-4.jpg\")
\nExplanation:
\nFrom the above figure we notice 3 are addends .Now add both the numbers
\n3 + 3 = 6
\nTherefore the sum is 6.<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-54.png\")
\nAnswer:
\n![\"Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Lesson](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Lesson-2.4-Add-Doubles-from-1-to-5-Apply-Grow-Practice-Question-5.jpg\")
\nExplanation:
\nFrom the above figure we notice 5 are addends .Now add both the numbers
\n5 + 5 = 10
\nTherefore the sum is 10.<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-55.png\")
\nAnswer:
\n2 + 2 = 4
\n2 – 2 = 0
\nExplanation:
\nWhen a\u00a0number\u00a0is\u00a0subtracted from itself\u00a0the difference is always equal to 0.
\nThus the difference is 0<\/p>\n
\n2 + 2 = ______
\nAnswer:
\n2 + 2 = 4
\nExplanation:
\nFrom the above figure we notice 2 are addends .Now add both the numbers
\n2 + 2 = 4
\nTherefore the sum is 4.<\/p>\n
\n5 + 5 = _______
\nAnswer:
\n5 + 5 = 10
\nExplanation:
\nFrom the above figure we notice 5 are addends .Now add both the numbers
\n5 + 5 = 10
\nTherefore the sum is 10.<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-56.png\")
\nAnswer:
\n![\"Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Lesson](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Lesson-2.4-Add-Doubles-from-1-to-5-Apply-Grow-Practice-Question-9.jpg\")
\nExplanation:
\nFrom the above figure we notice 3 are addends .Now add both the numbers
\n3 + 3 = 6
\nTherefore the sum is 6.<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-57.png\")
\nAnswer:
\n![\"Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Lesson](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Lesson-2.4-Add-Doubles-from-1-to-5-Apply-Grow-Practice-Question-10.jpg\")
\nExplanation:
\nFrom the above figure we notice 4 are addends .Now add both the numbers
\n4 + 4 = 8
\nTherefore the sum is 8.<\/p>\n
\nDIG DEEPER!<\/strong>
\nCircle the equations you can complete using doubles.
\n________ + ________ =\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a06 ________ + ________ = 5<\/p>\n
\nAnswer:
\n![\"Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Lesson](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Lesson-2.4-Add-Doubles-from-1-to-5-Apply-Grow-Practice-Question-11.jpg\")
<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-58-1.png\")
\nDraw a Picture:<\/p>\n
\nYou and your friend have the same number of flowers. There are 8 flowers in all. How many flowers do you each have?
\nDraw a picture:<\/p>\n
\nAnswer:
\n![\"Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Lesson](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Lesson-2.4-Add-Doubles-from-1-to-5-Show-Grow-Question-12.jpg\")
\nNumber of flowers with me = x
\nNumber of flowers with my friend = x
\nTotal number of flowers = 8
\nx + x = 8
\n4 + 4 = 8.<\/p>\n<\/a>Add Doubles from 1 to 5 Practice 2.4<\/h3>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-59.png\")
\n___________ + ___________ = ___________
\nAnswer:
\n4 + 4 = 8<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-60.png\")
\nAnswer:
\n![\"Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Add-Doubles-from-1](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Add-Doubles-from-1-to-5-Practice-2.4-Question-2.jpg\")
<\/p>\n
\nFrom the above figure we notice 3 are addends .Now add both the numbers
\n3 + 3 = 6
\nTherefore the sum is 6.<\/p>\n
\n2 + 2 = ________
\nAnswer:
\n2 + 2 = 4
\nExplanation:
\nFrom the above figure we notice 2 are addends .Now add both the numbers
\n2 + 2 = 4
\nTherefore the sum is 4.<\/p>\n
\n4 + 4 = _________
\nAnswer:
\n4 + 4 = 8
\nExplanation:
\nFrom the above figure we notice 4 are addends .Now add both the numbers
\n4 + 4 = 8
\nTherefore the sum is 8.<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-61.png\")
\nAnswer:
\n![\"Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Add-Doubles-from-1](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Add-Doubles-from-1-to-5-Practice-2.4-Question-5.jpg\")
\nExplanation:
\nFrom the above figure we notice 5 are addends .Now add both the numbers
\n5 + 5 = 10
\nTherefore the sum is 10.<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-62.png\")
\nAnswer:
\n![\"Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Add-Doubles-from-1](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Add-Doubles-from-1-to-5-Practice-2.4-Question-6.jpg\")
\nExplanation:
\nFrom the above figure we notice 3 are addends .Now add both the numbers
\n3 + 3 = 6
\nTherefore the sum is 6.<\/p>\n
\nDIG DEEPER!<\/strong>
\nCircle the equations you can complete using doubles.
\n_________ + _________ = 3\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 _________ + _________= 8<\/p>\n
\nAnswer:
\n![\"Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Add-Doubles-from-1](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Add-Doubles-from-1-to-5-Practice-2.4-Question-7.jpg\")
<\/p>\n
\nModeling Real Life<\/strong>
\nNewton and Descartes each have the same number of linking cubes. There are 6 linking cubes in all. How many linking cubes do Newton and Descartes have?
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-63.png\")
<\/p>\n
\nAnswer:
\nTotal Number of linking cubes = 6.
\nNewton and Descartes each have the same number of linking cubes
\nEach have 3 linking cubes
\n3 + 3 = 6.
\nNewton and Descartes each have 3 linking cubes.<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-64.png\")
\n___________ + ___________ = ___________
\nAnswer:
\n2 + 3 = 5
\nExplanation:
\nwe notice 2 hippos in the mud and 3 hippos came to join them.
\nso total number of hippos are add 2 and 3
\nTotal number of hippos = 2 + 3 = 5<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-65.png\")
\n___________ + ___________ = ___________
\nAnswer:
\n4 + 5 = 9
\nExplanation:
\nWe notice 4 zebras eating grass and 5 zebras joining them
\nso total number of zebras are add 4 and 5
\nTotal number of zebras = 4 + 5 = 9<\/p>\n<\/a>Lesson 2.5 Use Doubles<\/h3>\n
\nNumber of shells with me = 4
\nNumber of shells with my friend= 4
\nTotal Number of shells = 4 + 4 = 8<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-66.png\")
\nAnswer:
\nNumber of shells with me = 4
\nNumber of shells with my friend= 5
\nTotal Number of shells = 4 + 5 = 9<\/p>\n
\n3 + 4 = ______
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-67.png\")
\nAnswer:
\n3 + 3 + 1 = 7<\/p>\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-68.png\")
\nAnswer:
\n3 + 3 – 1 = 5<\/p>\n
\n2 + 3 = ______
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-69.png\")
\nAnswer:
\n2 + 2 + 1 =5<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-70.png\")
\nAnswer:
\n2 + 2 – 1 = 3<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-71.png\")
\nAnswer:
\n3 + 4 = 7
\n3 + 3 + 1 = 6 + 1 = 7<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-72.png\")
\nAnswer:
\n![\"Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Lesson-2.5-Use-Doubles-Question-4.jpg\")
<\/p>\n
\nMP Number Sense<\/strong>
\nUse each card once to write two addition equations.
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-73.png\")
\nAnswer:
\n2 + 2 = 4
\n2 + 3 = 5<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-74.png\")
\nWhich doubles can you use to find the sum?
\n4 + 4\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 5 + 5\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 3 + 3
\nAddition equation:<\/p>\n
\nAnswer:
\nNumber of grapes ate by me = 4
\nNumber of grapes ate by my friend = 4 + 1
\nNumber of grapes eaten = 4 + 4 + 1 = 9
\n4 + 4 is used to find the sum<\/p>\n
\nYou have 5 toy cars. Your friend has I fewer than you. How many cars do you and your friend have in all?<\/p>\n
\n4 + 4\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 6 + 6\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 5 + 5
\nAddition equation:<\/p>\n
\nAnswer:
\nNumber of toy cars with me = 5
\nNumber of toy cars with my friend = 5 – 1
\nTotal Number of cars = 5 + 5 – 1 = 10 – 1 = 9<\/p>\n<\/a>Use Doubles Practice 2.5<\/h3>\n
\n4 + 5 = _______
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-75.png\")
\nAnswer:
\n4 + 4 + 1 = 8 + 1 = 9<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-76.png\")
\nAnswer:
\n4 + 4 – 1 = 8 – 1 = 7<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-77.png\")
\nAnswer:
\n1 + 1 = 2
\n1 + 2 = 3<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-78.png\")
\nAnswer:
\n1 + 1 = 2
\n3 + 2 = 5<\/p>\n
\nNumber Sense<\/strong>
\nUse each card once to write two addition equations.
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-79.png\")
\nAnswer:
\n2 + 3 = 5
\n3 + 3 = 6<\/p>\n
\nModeling Real Life<\/strong>
\nNewton catches 2 butterflies. Descartes catches I more than Newton. How many butterflies do Newton and Descartes catch in all?
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-80.png\")
\nWhich doubles can you use to find the sum?
\n3 + 3\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 1 + 1\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 2 + 2<\/p>\n
\nAnswer:
\nNumber of butterflies with Newton = 2
\nNumber of butterflies with Descartes = 2 + 1.
\nTotal number of butterflies both caught = 2 + 2 + 1 = 4 + 1 = 5<\/p>\n
\nCircle the model that shows the missing number.
\n2 + ______ = 5
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-1st-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-81.png\")
\nAnswer:
\n2 + 3 = 5
\n![\"Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Lesson-2.5-Use-Doubles-Question-6.jpg\")
<\/p>\n<\/a>Lesson 2.6 Add in Any Order<\/h3>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-82.png\")
\n_________ + _________ = _________
\nAnswer:
\n2 + 4 = 6
\nExplanation:
\nFrom the above figure we notice 2 and 4 are addends .Now add both the numbers
\n2 + 4 = 6
\nWhatever may be the order of addends the sum is always the same.
\nTherefore the sum is 6<\/p>\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-83.png\")
\n_________ + _________ = _________
\nAnswer:
\n4 + 2 = 6
\nExplanation:
\nFrom the above figure we notice 2 and 4 are addends .Now add both the numbers
\n2 + 4 = 6<\/p>\n
\nTherefore the sum is 6<\/span>
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-84.png\")
\n_________ + _________ = _________
\nAnswer:
\n7 + 1 = 8
\nExplanation:
\nwhen a given number is increased by 1 then we get the next number of that number as sum.
\nThe next number of 7 is 8 as sum.
\nWhatever may be the order of addends the sum is always the same.
\nTherefore the sum is 8
\n<\/span><\/p>\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-85.png\")
\n_________ + _________ = _________
\nAnswer:
\n1 + 7 = 8
\nExplanation:
\nwhen a given number is increased by 1 then we get the next number of that number as sum.
\nThe next number of 7 is 8 as sum.
\nWhatever may be the order of addends the sum is always the same.
\nTherefore the sum is 8<\/span><\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-86.png\")
\nAnswer:
\n![\"Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Lesson-2.6-Add-Any-Order-Show-and-Grow-Question-3.jpg\")
<\/p>\n
\nExplanation:
\nFrom the above figure we notice 2 and 3 are addends .Now add both the numbers
\n2 + 3 = 5
\nWhatever may be the order of addends the sum is always the same.
\nTherefore the sum is 5<\/p>\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-87.png\")
\nAnswer:
\n![\"Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Lesson-2.6-Add-Any-Order-Show-and-Grow-Question-3..jpg\")
<\/p>\n
\nFrom the above figure we notice 2 and 3 are addends .Now add both the numbers
\n3 + 2 = 5
\nWhatever may be the order of addends the sum is always the same.
\nTherefore the sum is 5<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-88.png\")
\n_________ + _________ = _________
\nAnswer:
\n7 + 3 = 10
\nExplanation:
\nFrom the above figure we notice 7 and 3 are addends .Now add both the numbers
\n7 + 3 = 10
\nWhatever may be the order of addends the sum is always the same.
\nTherefore the sum is 10<\/p>\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-89.png\")
\n_________ + _________ = _________
\nAnswer:
\n3 + 7 = 10
\nExplanation:
\nFrom the above figure we notice 3 and 7 are addends .Now add both the numbers
\n3 + 7 = 10
\nWhatever may be the order of addends the sum is always the same.
\nTherefore the sum is 10<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-90.png\")
\nAnswer:
\n![\"Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Lesson-2.6-Add-Any-Order-Show-and-Grow-Question-5.jpg\")
\nExplanation:
\nFrom the above figure we notice 1 and 4 are addends .Now add both the numbers
\n1 + 4 = 5 or 4 + 1 = 5
\nWhatever may be the order of addends the sum is always the same.
\nTherefore the sum is 5<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-91.png\")
\nAnswer:
\n![\"Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Lesson-2.6-Add-Any-Order-Show-and-Grow-Question-6.jpg\")
<\/p>\n
\nFrom the above figure we notice 5 and 2 are addends .Now add both the numbers<\/span>
\n5 + 2 = 7 or 2 + 5 = 7<\/span>
\nWhatever may be the order of addends the sum is always the same.<\/span>
\nTherefore the sum is 7<\/span><\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-92.png\")
\nAnswer:
\n2 + 6 = 8
\n6 + 2 = 8
\nExplanation:
\nFrom the above figure we notice 6 and 2 are addends .Now add both the numbers
\n6 + 2 = 8 or 2 + 6 = 8
\nWhatever may be the order of addends the sum is always the same.
\nTherefore the sum is 8<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-93.png\")
\nAnswer:
\n9 = 8 + 1
\n9 = 1 + 8
\nExplanation:
\nFrom the above figure we notice 8 and 1 are addends .Now add both the numbers
\n8 + 1 = 9 or 1 + 8 = 9
\nWhatever may be the order of addends the sum is always the same.
\nTherefore the sum is 9<\/p>\n
\nMP Number Sense<\/strong>
\nUse the numbers shown to write two addition equations.
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-94.png\")
\nAnswer:
\n4 + 5 = 9
\n5 + 4 = 9
\nExplanation:
\nFrom the above figure we notice 4 and 5 are addends .Now add both the numbers
\n4 + 5 = 9 or 5 + 4 = 9
\nWhatever may be the order of addends the sum is always the same.
\nTherefore the sum is 9<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-95.png\")
\nWhich equations describe your shirts?
\n3 + 4 = 7\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 3 + 7 = 10
\n7 + 3 = 10\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 4 + 3 = 7
\nShow how you know:<\/p>\n
\nAnswer:
\nNumber of green shirts = 3
\nNumber of blue shirts\u00a0 =\u00a0 X
\nTotal number of shirts = 7
\n3 + X = 7
\nX = 7 – 3 = 4
\nNumber of blue shirts = 4
\nEquation: 3 + 4 = 7 or 4 + 3 = 7<\/p>\n
\nYou have 5 cups. 2 are yellow. The rest are red. How many red cups do you have?
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-96.png\")
\nWhich equations describe your cups?
\n5 + 2 = 7\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a02 + 3 = 5
\n2 + 5 = 7\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a03 + 2 = 5
\nShow how you know:<\/p>\n
\nAnswer:
\nNumber of red cups = x
\nNumber of yellow cups = 2
\nTotal number of cups = 5
\nx + 2 = 5
\nx = 5 – 2 = 3
\nNumber of red cups = 3
\nEquation : 3 + 2 = 5 or 2 + 3 = 5<\/p>\n<\/a>Add in Any Order Practice 2.6<\/h3>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-97.png\")
<\/p>\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-98.png\")
\nAnswer:
\n![\"Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Add-in-Any-Order-Practice-2.6-Question-1.jpg\")
\nExplanation:
\nFrom the above figure we notice 3 and 4 are addends .Now add both the numbers
\n3 + 4 = 7 or 4 + 3 = 7
\nWhatever may be the order of addends the sum is always the same.
\nTherefore the sum is 7<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-99.png\")
\nAnswer:
\n7 + 2 = 9<\/p>\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-100.png\")
\nAnswer:
\n2 + 7 = 9
\nExplanation:
\nFrom the above figure we notice 2 and 7 are addends .Now add both the numbers
\n2 + 7= 9 or 7 + 2 = 9
\nWhatever may be the order of addends the sum is always the same.
\nTherefore the sum is 9<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-101.png\")
\nAnswer:
\n![\"Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Add-in-Any-Order-Practice-2.6-Question-3.jpg\")
\nExplanation:
\nFrom the above figure we notice 6 and 4 are addends .Now add both the numbers
\n6 + 4 = 10 or 4 + 6 = 10
\nWhatever may be the order of addends the sum is always the same.
\nTherefore the sum is 10<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-102.png\")
\nAnswer:
\n6 = 5 + 1
\n6 = 1 + 5
\nExplanation:
\nFrom the above figure we notice 6 and 4 are addends .Now add both the numbers
\n5 + 1 = 6 or 1 + 5 = 6
\nwhen a given number is increased by 1 then we get the next number of that number as sum
\nWhatever may be the order of addends the sum is always the same.
\nTherefore the sum is 6<\/p>\n
\nMP Number Sense<\/strong>
\nUse the numbers shown to write two addition equations.
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-103.png\")
\nAnswer:
\n2 + 8 = 10
\n8 + 2 = 10
\nExplanation:
\nFrom the above equations we notice 2 and 8 are addends .Now add both the numbers
\n2 + 8 = 10 or 8 + 2 = 10
\nWhatever may be the order of addends the sum is always the same.
\nTherefore the sum is 10<\/p>\n
\nModeling Real Life<\/strong>
\nYou have 7 tomatoes. 2 are red. The rest are yellow. How many yellow tomatoes do you have?
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-104.png\")
\nWhich equations describe your tomatoes?
\n2 + 5 = 7 5 + 2 = 7
\n7 + 2 = 9 2 + 7 = 9
\nShow how you know:<\/p>\n
\nAnswer:
\nTotal number of tomatoes = 7
\nNumber of red tomatoes = 2
\nNumber of yellow tomatoes = x
\nExplanation:
\n7 = 2 + x
\nx = 7 – 2 = 5
\nNumber of yellow tomatoes = 5
\nEquations: 2 + 5 = 7 or 5 + 2 = 7<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-105.png\")
\n5 + _______ = 8
\nAnswer:
\n5 + 3 = 8
\nExplanation:
\nFrom the above equation we notice to get 8 as sum what should be added for 5
\nif we add 3 to 5 we get 8 as sum.
\nTherefore 5 + 3 = 8 .<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answers-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-106.png\")
\n5 + ________ = 10
\nAnswer:
\n5 + 5 = 10
\nExplanation:
\nFrom the above equation we notice to get 10 as sum what should be added for 5
\nif we add 5 to 5 we get 10 as sum.
\nTherefore 5 + 5 = 10 .<\/p>\n<\/a>Lesson 2.7 Count on to Add<\/h3>\n
![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Solutions-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-107.png\")
\nAnswer:
\n![\"Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Lesson-2.7-Count-on-to-Add-Explore-Grow\"](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Lesson-2.7-Count-on-to-Add-Explore-Grow.jpg\")
\nNumber of coins in piggy bank = 5
\nNumber of coins added = 2
\nTotal coins = 5 + 2 = 7.<\/p>\n
\n7 + 2 = _________
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Solutions-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-108.png\")
\nAnswer:
\n7 + 2 = 9
\n![\"Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Lesson-2.7-Count-on-to-Add-Show-Grow-Question-1\"](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Lesson-2.7-Count-on-to-Add-Show-Grow-Question-1.jpg\")
\nExplanation:
\nCount on\u00a0method to add numbers. To add 7 and 2, start from 7 and count on 2 steps to arrive at the sum (9).<\/p>\n
\n3 + 1 = ________
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Solutions-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-109.png\")
\nAnswer:
\n3 + 1 = 4
\n![\"Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Lesson-2.7-Count-on-to-Add-Show-Grow-Question-2\"](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Lesson-2.7-Count-on-to-Add-Show-Grow-Question-2.jpg\")
\nExplanation:
\nCount on method to add numbers. To add 3 and 1, start from 3 and count on 1 step to arrive at the sum (4).<\/p>\n
\n4 + 6 = ________
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Solutions-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-110.png\")
\nAnswer:
\n4 + 6 = 10
\n![\"Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Lesson-2.7-Count-on-to-Add-Show-Grow-Question-3\"](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-Strategies-within-10-Lesson-2.7-Count-on-to-Add-Show-Grow-Question-3.jpg\")
\nExplanation:
\nCount on method to add numbers. To add 4 and 6, start from 4 and count on 6 steps to arrive at the sum (10).<\/p>\n
\n0 + 5 = ________
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Solutions-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-111.png\")
\nAnswer:
\n0 + 5 = 5
\n![\"Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-strategies-within-10-Lesson-2.7-Count-on-to-Add-Show-Grow-Question-4\"](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-strategies-within-10-Lesson-2.7-Count-on-to-Add-Show-Grow-Question-4.jpg\")
<\/p>\n
\nCount on method to add numbers. To add 0 and 5, start from 0 and count on 5 steps to arrive at the sum (5).<\/p>\n
\n4 + 2 = _________
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Solutions-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-112.png\")
\nAnswer:
\n4 + 2 = 6
\n![\"Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-strategies-within-10-Lesson-2.7-Count-on-to-Add-Apply-Grow-practice-Question-5\"](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-strategies-within-10-Lesson-2.7-Count-on-to-Add-Apply-Grow-practice-Question-5.jpg\")
\nExplanation:
\nCount on method to add numbers. To add 4 and 2, start from 4 and count on 2 steps to arrive at the sum (6).<\/p>\n
\n6 + 1 = ________
\n
\nAnswer:
\n6 + 1 = 7<\/p>\n![\"Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-strategies-within-10-Lesson-2.7-Count-on-to-Add-Apply-Grow-practice-Question-6\"](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-strategies-within-10-Lesson-2.7-Count-on-to-Add-Apply-Grow-practice-Question-6.jpg\")
\nExplanation:
\nCount on method to add numbers. To add 6 and 1, start from 6 and count on 1 step to arrive at the sum (7).<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Solutions-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-113.png\")
\nAnswer:
\n![\"Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-strategies-within-10-Lesson-2.7-Count-on-to-Add-Apply-Grow-practice-Question-7\"](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-strategies-within-10-Lesson-2.7-Count-on-to-Add-Apply-Grow-practice-Question-7-1.jpg\")
\nExplanation:
\nFrom the above figure we notice 5 and 4 are addends .Now add both the numbers
\n5 + 4 = 9
\nTherefore the sum is 9.<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Solutions-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-114.png\")
\nAnswer:
\n![\"Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-strategies-within-10-Lesson-2.7-Count-on-to-Add-Apply-Grow-practice-Question-8\"](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-strategies-within-10-Lesson-2.7-Count-on-to-Add-Apply-Grow-practice-Question-8.jpg\")
\nExplanation:
\nFrom the above figure we notice 3 and 2 are addends .Now add both the numbers
\n3 + 2 = 5
\nTherefore the sum is 5.<\/p>\n
\n________ = 0 + 7
\nAnswer:
\n7 = 0 + 7
\nExplanation:
\nFrom the above figure we notice 0 and 7 are addends . Adding 0 to any number gives the sum as the number itself.Now add both the numbers
\n0 + 7 = 7
\nThus the result is 7.<\/p>\n
\n________ = 2 + 8
\nAnswer:
\n10 = 2 + 8
\nExplanation:
\nFrom the above figure we notice 8 and 2 are addends .Now add both the numbers
\n2 + 8 = 10
\nTherefore the sum is 10.<\/p>\n
\nDIG DEEPER!<\/strong>
\nTell what problems Newton and Descartes solved. Think: How are the problems the same? How are they different?
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Solutions-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-115.png\")
\nAnswer:
\n![\"\"](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-strategies-within-10-Lesson-2.7-Count-on-to-Add-Apply-Grow-practice-Question-11.jpg\")
<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Solutions-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-116.png\")
\nModel:<\/p>\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Solutions-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-117.png\")
<\/p>\n
\nAnswer:
\nNumber of clues with me = 3
\nNumber of clues with my friend = x
\nTotal number of clues = 8
\nExplanation:
\n3 + x = 8
\nx = 8 – 3 = 5
\nNumber of clues with my friend = 5
\nEquation: 3 + 5 = 8
\n![\"Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-strategies-within-10-Lesson-2.7-Count-on-to-Add-Think-Grow-Modeling-Real-Life\"](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-strategies-within-10-Lesson-2.7-Count-on-to-Add-Think-Grow-Modeling-Real-Life.jpg\")
\nExplanation:
\nCount on method to add numbers. To add 3 and 5 start from 3 and count on 5 steps to arrive at the sum (8).<\/p>\n
\nYour friend collects 4 cans. You and your friend collect 10 cans in all. How many cans do you collect?
\nModel:<\/p>\n<\/p>\n
\nAnswer:
\nNumber of cans with my friend = 4
\nTotal number of cans = 10
\nNumber of cans with me\u00a0 = X
\nExplanation:
\n4 + X = 10
\nX= 10 – 4 = 6
\nNumber of cans with me = 6
\nEquation: 4 + 6 = 10
\n![\"Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-strategies-within-10-Lesson-2.7-Count-on-to-Add-Show-Grow-](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-strategies-within-10-Lesson-2.7-Count-on-to-Add-Show-Grow-Question-12.jpg\")
\nExplanation:
\nCount on method to add numbers. To add 4 and 6, start from 4 and count on 6 steps to arrive at the sum (10).<\/p>\n<\/a>Count on to Add Practice 2.7<\/h3>\n
\n4 + 3 = ________
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Solutions-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-118.png\")
\nAnswer:
\n4 + 3 = 7
\n![\"Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-strategies-within-10-](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-strategies-within-10-Count-on-to-Add-Practice-2.7-Question-1.jpg\")
\nExplanation:
\nCount on method to add numbers. To add 4 and 3 start from 3 and count on 3 steps to arrive at the sum (7).<\/p>\n
\n8 + 1 = ________
\n
\nAnswer:
\n8 + 1 = 9
\n![\"Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-strategies-within-10-](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-strategies-within-10-Count-on-to-Add-Practice-2.7-Question-2.jpg\")
\nExplanation:
\nCount on method to add numbers. To add 8 and 1 start from 8 and count on 1 step to arrive at the sum (9).<\/p>\n
\n6 + 2 = ________
\n
\nAnswer:
\n6 + 2 = 8
\n![\"Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-strategies-within-10-](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-strategies-within-10-Count-on-to-Add-Practice-2.7-Question-3.jpg\")
\nExplanation:
\nCount on method to add numbers. To add 6 and 2 start from 6 and count on 2 steps to arrive at the sum (8).<\/p>\n
\n7 + 3 = ________
\n
\nAnswer:
\n7 + 3 = 10
\n![\"Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-strategies-within-10-](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-strategies-within-10-Count-on-to-Add-Practice-2.7-Question-4.jpg\")
\nExplanation:
\nCount on method to add numbers. To add 7 and 3 start from 7 and count on 3 steps to arrive at the sum (10).<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Solutions-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-119.png\")
\nAnswer:
\n![\"Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-strategies-within-10-](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-strategies-within-10-Count-on-to-Add-Practice-2.7-Question-5.jpg\")
<\/p>\n
\nFrom the above figure we notice 0 and 9 are addends . Adding 0 to any number gives the sum as the number itself.Now add both the numbers
\n0 + 9 = 9
\nThus the result is 9.<\/p>\n
\n______ = 1 + 5
\nAnswer:
\n6 = 1 + 5
\nExplanation:
\nwhen a given number is increased by 1 then we get the next number of that number as sum.
\nThe next number of 5 is 6
\nTherefore sum = 6 .<\/p>\n
\nDIG DEEPER!<\/strong>
\nTell what problems Newton and Descartes solved. Think: How are the problems the same? How are they different?
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Solutions-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-120.png\")
\nAnswer:
\nBoth the problems are the same .
\nsum is the same only the order of the addends are different .
\nNewton have 3 and 4 as addends 3 added to 4 whereas in Descartes the 4 is added to 3. whatever may be the order of addends the sum will always be the same .
\n![\"Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-strategies-within-10-](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-strategies-within-10-Count-on-to-Add-Practice-2.7-Question-7.jpg\")
<\/p>\n
\nModeling Real Life<\/strong>
\nYou have 4 coins. You and your friend have 9 coins in all. How many coins does your friend have?
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Solutions-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-121.png\")
\n<\/p>\n
\nAnswer:
\nNumber of coins with me = 4
\nNumber of coins with my friend = X
\nTotal coins = 9
\nExplanation:
\n4 + X = 9
\nX = 9 -4 = 5
\nNumber of coins with my friend = 5
\nEquation : 4 + 5 = 9
\n![\"Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-strategies-within-10-](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-strategies-within-10-Count-on-to-Add-Practice-2.7-Question-8.jpg\")
\nExplanation:
\nCount on method to add numbers. To add 4 and 5 start from 4 and count on 5 steps to arrive at the sum (9).<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Solutions-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-122.png\")
\nAnswer:
\n4 – 1 = 3
\nExplanation:
\nwhen a number is reduced by 1, then we get the previous number of that number as difference.
\nprevious number of 4 is 3 .
\nTherefore difference = 3<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Solutions-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-123.png\")
\nAnswer:
\n5 – 3 = 2
\nExplanation:
\nFrom the above equation we notice 5 is minuend and 3 is subtrahend.
\nNow subtract
\n5 – 3 = 2
\nThus the difference is 2<\/p>\n<\/a>Lesson 2.8 Count Back to Subtract<\/h3>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-124.png\")
\nAnswer:
\nNumber of students = 8
\nNumber of students left = 2
\nNumber of students remained in class = 8 – 2 = 6
\n![\"Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-strategies-within-10-Lesson-2.8-Count-Back-to-Subtract-Explore-Grow\"](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-strategies-within-10-Lesson-2.8-Count-Back-to-Subtract-Explore-Grow.jpg\")
<\/p>\n
\n5 – 4 = _________
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-125.png\")
\nAnswer:
\n5 – 4 = 1
\n![\"Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-strategies-within-10-Lesson-2.8-Count-Back-to-Subtract-Show-Grow-Question-1\"](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-strategies-within-10-Lesson-2.8-Count-Back-to-Subtract-Show-Grow-Question-1.jpg\")
\nExplanation:
\nUse the count back method to subtract.To subtract 4 from 5, one can start at 5 and count back 4 steps we get difference as 1.<\/p>\n
\n7 – 3 = ________
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-126.png\")
\nAnswer:
\n7 – 3 = 4
\n![\"Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-strategies-within-10-Lesson-2.8-Count-Back-to-Subtract-Show-Grow-Question-2\"](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-strategies-within-10-Lesson-2.8-Count-Back-to-Subtract-Show-Grow-Question-2.jpg\")
\nExplanation:
\nUse the count back method to subtract.To subtract 3 from 7, one can start at 7 and count back 3 steps we get difference as 4.<\/p>\n
\n6 – 1 = _________
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-127.png\")
\nAnswer:
\n6 – 1 = 5
\n![\"Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-strategies-within-10-Lesson-2.8-Count-Back-to-Subtract-Show-Grow-Question-3\"](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-strategies-within-10-Lesson-2.8-Count-Back-to-Subtract-Show-Grow-Question-3.jpg\")
\nExplanation:
\nUse the count back method to subtract.To subtract 1 from 6, one can start at 6 and count back 1 step we get difference as 5.<\/p>\n
\n10 – 8 = ________
\n
\nAnswer:
\n10 – 8 = 2
\n![\"Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-strategies-within-10-Lesson-2.8-Count-Back-to-Subtract-Show-Grow-Question-4\"](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-strategies-within-10-Lesson-2.8-Count-Back-to-Subtract-Show-Grow-Question-4.jpg\")
\nExplanation:
\nUse the count back method to subtract.To subtract 8 from 10, one can start at 10 and count back 8 steps we get difference as 2.<\/p>\n
\n10 – 6 = _________
\n
\nAnswer:
\n10 – 6 = 4
\n![\"Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-strategies-within-10-Lesson-2.8-Count-Back-to-Subtract-Apply-Grow-Practice-Question-5\"](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-strategies-within-10-Lesson-2.8-Count-Back-to-Subtract-Apply-Grow-Practice-Question-5.jpg\")
\nExplanation:
\nUse the count back method to subtract.To subtract 6 from 10, one can start at 10 and count back 6 steps we get difference as 4.<\/p>\n
\n9 – 3 = _________
\n
\nAnswer:
\n9 – 3 = 6
\n![\"Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-strategies-within-10-Lesson-2.8-Count-Back-to-Subtract-Apply-Grow-Practice-Question-6\"](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-strategies-within-10-Lesson-2.8-Count-Back-to-Subtract-Apply-Grow-Practice-Question-6.jpg\")
\nExplanation:
\nUse the count back method to subtract.To subtract 3 from 9, one can start at 9 and count back 3 steps we get difference as 6.<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-128.png\")
\nAnswer:
\n![\"Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-strategies-within-10-Lesson-2.8-Count-Back-to-Subtract-Apply-Grow-Practice-Question-7\"](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-strategies-within-10-Lesson-2.8-Count-Back-to-Subtract-Apply-Grow-Practice-Question-7-1.jpg\")
\nExplanation:
\nFrom the above equation we notice 5 is minuend and 2 is subtrahends. Now subtract the 5 and 2
\n5 – 2 = 3
\nThus the difference is 3<\/p>\n
\n![\"Big](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Answer-Key-Grade-1-Chapter-2-Fluency-and-Strategies-within-10-129.png\")
\nAnswer:
\n![\"Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-strategies-within-10-Lesson-2.8-Count-Back-to-Subtract-Apply-Grow-Practice-Question-8\"](\"https:\/\/ccssmathanswers.com\/wp-content\/uploads\/2021\/01\/Big-Ideas-Math-Book-1st-Grade-Answer-Key-Chapter-2-Fluency-strategies-within-10-Lesson-2.8-Count-Back-to-Subtract-Apply-Grow-Practice-Question-8.jpg\")
<\/p>\n
\nFrom the above equation we notice 8 is minuend and 0 is subtrahends Subtracting 0 from any number gives the number itself as the difference. Now subtract the 8 and 0
\n8 – 0 = 8
\nThus the difference is 8<\/p>\n
\n________ = 7 – 6
\nAnswer:
\n1<\/p>\n
\n_________ = 4 – 1
\nAnswer:
\n3<\/p>\n
\nMP Structure<\/strong>