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NS 1.0 Students compute with very large and very small numbers, positive integers, decimals, and fractions and understand the relationship between decimals, fractions, and percents. They understand the relative magnitudes of numbers. UNDERLYING SKILLS AND CONCEPTS: use mental math; understand the meaning of addition and subtraction Review Addition and Subtraction Facts ! Addition and subtraction facts are related. They are inverse operations. You can use the table to find addition and subtraction facts. E x am p l E 1 Addition is the inverse, or opposite, of subtraction. 1 2 3 4 5 6 7 8 1 1 2 3 4 5 6 7 8 9 10 11 2 2 3 4 5 6 7 8 9 10 11 12 3 3 4 5 6 7 8 9 10 11 12 13 4 4 5 6 7 8 9 10 11 12 13 14 5 5 6 7 8 9 10 11 12 13 14 15 6 6 7 8 9 10 11 12 13 14 15 16 7 7 8 9 10 11 12 13 14 15 16 17 8 8 9 10 11 12 13 14 15 16 17 18 9 10 9 9 10 11 12 13 14 15 16 17 18 19 5 ! 7 " 12, 10 10 11 12 13 14 15 16 17 18 19 20 then you know that 12 # 7 " 5 and 12 # 5 " 7. If you know that 0 0 8 ! 9 " 17, then you know that 17 # 9 " 8 and 17 # 8 " 9. E x am p l E 2 A family of facts is a related set of equations. There are usually four equations, or facts, in the family. Here is a family of facts for the numbers 6, 13, and 19. 13 ! 6 " 19 19 # 6 " 13 6, 13 and 19 make a fact “family.” 6 ! 13 " 19 19 # 13 " 6 Notice that there are two addition facts and two subtraction facts. Subtraction is the inverse, or opposite, of addition. 19 # 6 " 13 13 ! 6 " 19 6 page 14 19 19 # 13 " 6 13 6 ! 13 " 19 Chapter 2 – Lesson 1 E – © CSL Associates, Inc. All rights reserved. If you know that 0 1 2 3 4 5 6 7 8 9 10 Name P RAC T I C E See how quickly you can write the answers to these basic facts. 1. 3 5 8 6. 16 7 9 11. 12 7 19 16. 13 6 7 2. 4 9 13 7. 15 9 6 12. 16 9 7 17. 17 9 8 3. 7 5 12 8. 12 8 20 13. 19 10 9 18. 12 8 4 4. 6 8 14 9. 13 8 5 14. 18 9 9 19. 19 9 10 5. 17 9 8 14 15. 12 7 5 20. 11 9 10. 9 5 2 Complete the fact. Then write three related facts. 21. 4 9 13 22. 15 7 8 23. 7 9 16 9 4 13 15 8 7 9 7 16 13 9 4 7 8 15 16 7 9 13 4 9 8 7 15 16 9 7 Answer Yes or No. Explain your decision. 24. If you know the amount of money you have and how much you and Mary have together, can you find out how much money Mary has? Yes. E – © CSL Associates, Inc. All rights reserved. You can subtract what you have from the total that you both have. 25. Is there a number 10 or less that you can add to another number No. also 10 or less to get a sum of 22? The greatest sum would be 20. Circle the correct choice. 26. If you are 5 feet tall and you sister is 3 feet shorter, which operation would you use to find your sister’s height? A addition Math Reasoning B subtraction C multiplication Inverse Operations D division MR 2.3, 2.6 27. Addition and subtraction are inverse operations. Explain what this means. They are opposite from each other; addition undoes subtraction. You can use subtraction to find missing addends. Chapter 2 – Lesson 1 page 15 MCX94.HW.CL.G5.FM&Lesson.v211 8/2/04 18:02 Page 10 Name …at home! P RAC T I C E See how quickly you can write the answers to these basic facts. 1. 4 5 9 6. 14 7 7 11. 10 7 17 16. 14 6 8 2. 5 9 14 7. 16 9 7 12. 14 9 5 17. 15 9 6 3. 6 5 11 8. 11 8 19 13. 18 10 8 18. 11 8 3 4. 7 8 15 9. 12 8 4 14. 12 9 3 19. 15 9 6 5. 18 9 9 13 15. 16 7 9 20. 9 9 0 10. 8 5 Complete the fact. Then write three related facts. 21. 5 7 12 22. 14 6 8 23. 8 9 17 7 5 12 14 8 6 9 8 17 12 7 5 8 6 14 17 9 8 12 5 7 6 8 14 17 8 9 Answer Yes or No. Explain your decision. 24. If you know the amount of money you have and how much you and (Joan’s $ my $) my $ Joan’s $. 25. Is there a number 20 or less that you can add to another number No. also 20 or less to get a sum of 44? 20 20 40 which is less than 44. All the other numbers are less Circle the correct choice. than 20 and the sums will be less than 44. 26. If you are 5 feet tall and you brother is 2 feet shorter, which operation would you use to find your brother’s height? A addition Math Reasoning B subtraction C multiplication D division Inverse Operations MR 2.3, 2.6 27. Circle the two equations that are inverse operations. 15 7 8 page 10 8 5 13 7 6 13 Home Resource and Homework 8 7 15 Chapter 2 Lesson 1 E – © CSL Associates, Inc. All rights reserved. Yes. Joan have together, can you find out how much money Joan has? MCX94TEG5CH01_32.v7.4.2 2/24/01 19:42 Page 29 Name P RAC T I C E See how quickly you can write the answers to these basic facts. 1. 3 5 8 6. 16 7 9 11. 12 7 19 16. 13 6 7 2. 4 9 13 7. 15 9 6 12. 16 9 7 17. 17 9 8 3. 7 5 12 8. 12 8 20 13. 19 10 9 18. 12 8 4 4. 6 8 14 9. 13 8 5 14. 18 9 9 19. 19 9 10 5. 17 9 8 14 15. 12 7 5 20. 11 9 10. 9 5 2 Complete the fact. Then write three related facts. 21. 4 9 13 22. 15 7 8 23. 7 9 16 9 4 13 15 8 7 9 7 16 13 9 4 7 8 15 16 7 9 13 4 9 8 7 15 16 9 7 Answer Yes or No. Explain your decision. 24. If you know the amount of money you have and how much you and Mary have together, can you find out how much money Mary has? Yes. E – © CSL Associates, Inc. All rights reserved. You can subtract what you have from the total that you both have. 25. Is there a number 10 or less that you can add to another number No. also 10 or less to get a sum of 22? The greatest sum would be 20. Circle the correct choice. 26. If you are 5 feet tall and you sister is 3 feet shorter, which operation would you use to find your sister’s height? A addition Math Reasoning B subtraction C multiplication Inverse Operations D division MR 2.3, 2.6 27. Addition and subtraction are inverse operations. Explain what this means. They are opposite from each other; addition undoes subtraction. You can use subtraction to find missing addends. Chapter 2 – Lesson 1 Student Book Page page 15 Name …at home! P RAC T I C E See how quickly you can write the answers to these basic facts. 1. 4 5 9 6. 14 7 7 11. 10 7 17 16. 14 6 8 2. 5 9 14 7. 16 9 7 12. 14 9 5 17. 15 9 6 3. 6 5 11 8. 11 8 19 13. 18 10 8 18. 11 8 3 4. 7 8 15 9. 12 8 4 14. 12 9 3 19. 15 9 6 5. 18 9 9 13 15. 16 7 9 20. 9 9 0 10. 8 5 Complete the fact. Then write three related facts. 21. 5 7 12 22. 14 6 8 23. 8 9 17 7 5 12 14 8 6 9 8 17 12 7 5 8 6 14 17 9 8 12 5 7 6 8 14 17 8 9 Answer Yes or No. Explain your decision. 24. If you know the amount of money you have and how much you and (Joan’s $ my $) my $ Joan’s $. 25. Is there a number 20 or less that you can add to another number No. also 20 or less to get a sum of 44? 20 20 40 which is less than 44. All the other numbers are less Circle the correct choice. than 20 and the sums will be less than 44. 26. If you are 5 feet tall and you brother is 2 feet shorter, which operation would you use to find your brother’s height? A addition Math Reasoning B subtraction C multiplication D division Inverse Operations MR 2.3, 2.6 27. Circle the two equations that are inverse operations. 15 7 8 page 10 8 5 13 7 6 13 Home Resource and Homework 8 7 15 Chapter 2 Lesson 1 E – © CSL Associates, Inc. All rights reserved. Yes. Joan have together, can you find out how much money Joan has?