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Click Name LESSON Here Date Class Practice C 9-5 Subtracting Integers Find each difference. 1. 29 ! (!11) 2. !14 ! 12 3. !9 ! (!15) 4. !8 ! (!25) 5. !101 ! 38 6. 53 ! (!17) 7. 7 ! (!12) ! 5 8. 4 ! (!23) ! (!7) 9. !2 ! (!6) ! (!1) Evaluate n ! (!9) for each value of n. 10. n " 5 11. n " 0 12. n " !38 13. n " 1 14. n " 12 15. n " !16 16. n " !110 17. n " !26 18. n " 51 Evaluate each expression for the given value of the variable. 19. x ! (!8), x " 14 20. w ! (!43), w " 8 21. z ! 9, z " !17 22. !45 ! p, p " !6 23. !5 ! m, m " 11 24. n ! 14, n " !30 25. y ! (!11), y " !19 26. v ! 20, v " !43 27. c ! (!29), c " 100 28. Let x and y be opposite numbers. Subtract y from x and then subtract x from y. Describe the two differences. Copyright © by Holt, Rinehart and Winston. All rights reserved. 29. How is subtracting a negative integer related to its absolute value and addition? 49 Holt Middle School Math Course 1 Practice B 9-5 Subtracting Integers Practice A 9-5 Subtracting Integers LESSON LESSON Write the subtraction modeled on each number line. Write the subtraction modeled on each number line. 1. 1. !1 3 !5 !4 !3 !2 !1 2. 0 1 3 4 4 0 !2 !1 1 3. 2 3 4 5 6 7 8 5 !5 !5 !4 !3 !2 !1 2. 4 ! (!2) 4. 2 0 1 2 3 4 5 6 7 8 !5 !4 !3 !2 !1 0 1 2 3 4 5 !(!1) 8. !3 ! 7 7. !2 ! (!1) 10. 15 ! (!8) 16. n # !3 9 11. This morning, the temperature was 4"F below zero. By evening the temperature had dropped 5 degrees. Write a subtraction expression to model this situation. 47 Holt Middle School Math Course 1 Practice C 9-5 Subtracting Integers 9. !9 ! (!5) 23 11. 0 ! (!6) 6 12. !20 ! (!9) !4 !11 14. n # !4 !1 17. n # 1 !2 3 15. n # 5 7 18. n # 0 2 20. Washington, D.C., has an elevation of 1 foot above sea level. The elevation of New Orleans is 8 feet below sea level. What is the difference in the two cities’ elevations? 9 feet 48 Copyright © by Holt, Rinehart and Winston. All rights reserved. Holt Middle School Math Course 1 Reteach 9-5 Subtracting Integers LESSON Find each difference. Two-color counters can help you understand integers. 1. 29 ! (!11) 40 2. !14 ! 12 4. !8 ! (!25) 17 5. !101 ! 38 !26 !139 8. 4 ! (!23) ! (!7) 34 3. !9 ! (!15) 6 6. 53 ! (!17) 70 9. !2 ! (!6) ! (!1) $1 10. n # 5 14 11. n # 0 9 12. n # !38 !29 13. n # 1 10 14. n # 12 21 15. n # !16 !7 17. n # !26 !17 18. n # 51 zero pair 5 1 $ (!1) = 0 You can use two-color counters to find the difference between integers. 5 ! 7 The first integer tells you how many counters to start off with. If there are not enough counters to subtract, add zero pairs. 60 Evaluate each expression for the given value of the variable. 19. x ! (!8), x # 14 20. w ! (!43), w # 8 22 51 !26 22. !45 ! p, p # !6 23. !5 ! m, m # 11 24. n ! 14, n # !30 !39 !8 Then take away the number of counters given by the second integer. 21. z ! 9, z # !17 !16 !44 26. v ! 20, v # !43 The remaining counters represent the difference. 5 ! 7 # !2 27. c ! (!29), c # 100 Use counters to find each difference. 129 !63 1. !3 ! (5) 28. Let x and y be opposite numbers. Subtract y from x and then subtract x from y. Describe the two differences. 29. How is subtracting a negative integer related to its absolute value and addition? The differences are opposite Subtracting a negative integer numbers. !8 5. !4 ! (!3) !1 9. 2 ! (!3) is the same as adding its 5 absolute value. 49 Copyright © by Holt, Rinehart and Winston. All rights reserved. !1 One positive counter and one negative counter is called a zero pair because together they have a value of zero. Evaluate n ! (!9) for each value of n. Copyright © by Holt, Rinehart and Winston. All rights reserved. 10 6 LESSON 25. y ! (!11), y # !19 8. 4 ! (!6) 19. In a golf tournament, Sarah scored a $2 on the first round and a !4 on the second round. What was the difference between her scores on the first two rounds? !4 ! 5 Copyright © by Holt, Rinehart and Winston. All rights reserved. !7 6. !10 ! (!3) !1 4 9. 4 ! (!5) 10 ! 5 !7 5. !5 ! 2 Evaluate n ! (!2) for each value of n. !10 10. In the first play of the football game, the Lions gained 10 yards and then lost 5 yards by a penalty. Write a subtraction expression to model this situation. 9 4. 8 ! (!1) 13. n # 2 !7 !101 1 Find each difference. 5 4 Find each difference. 16. n # !110 !(!2) !5 ! (!1) 6. 1 ! (!4) F !5 G3 H !3 J 5 ! 14 5 ! (!3) 5. !5 ! 2 A 3 B !7 ! C 7 D !3 7. 7 ! (!12) ! 5 4 !5 Circle the letter of the correct difference. 7. 2 ! 9 3 3 2 2 ! (!3) !5 !4 !3 !2 !1 2 4 ! (!2) 3. 1 1 2 0 !1 ! 5 0 0 $4 !2 !1 !1 !8 !7 !6 !5 !4 !3 !2 !1 !1 !1 ! 3 3!1 ! (!2) 2 !3 Holt Middle School Math Course 1 Copyright © by Holt, Rinehart and Winston. All rights reserved. 100 2. 5 ! 8 3. !9 ! (!7) !3 !2 6. 2 ! (!5) 10. !7 ! (!3) !5 7. !6 ! 4 7 8. 5 ! (!4) !10 11. 10 ! 8 2 !4 50 4. 1 ! 6 9 12. !4 ! (!5) 1 Holt Middle School Math Course 1 Holt Middle School Math Course 1