Page 277 - Basic College Mathematics with Early Integers

254 C HAPTE R 3 I FRACTIONS

1 1 1 1 4 2 5 3
13. 2 # 3 14. 2 # 7 15. 3 # 6 16. 5 # 7
5 2 4 8 5 7 6 5
Exact: Exact: Exact: Exact:

Estimate: Estimate: Estimate: Estimate:

1 1 2 1 4 5
# # # #
17. 5 2 18. 6 3 19. 3 1 20. 2 2
2 3 3 2 5 8
2 1 5 1
21. 2 , 22. , 4
3 7 9 5

Objective Choose the best estimate for each sum or difference. See Examples 9 and 12.

7 1 7 1
23. 3 + 2 24. 3 - 2
8 5 8 5
a. 6 b. 5 c. 1 d. 2 a. 6 b. 5 c. 1 d. 2
1 1 1 1
25. 8 + 1 26. 8 - 1
3 2 3 2
a. 4 b. 10 c. 6 d. 16 a. 4 b. 10 c. 6 d. 16

Add. For Exercises 27 through 30, find an exact sum and an estimated sum. See Examples 9 through 11.
7 4 3 5
27. 4 28. 7 29. 10 30. 12
12 11 14 12
1 2 4 1
+2 +3 + 3 + 4
12 11 7 6
Exact: Exact: Exact: Exact:

Estimate: Estimate: Estimate: Estimate:

1 2 3 2
31. 9 32. 6 33. 12 34. 8
5 13 14 9
2 7 10 32
+8 +8
25 26 5 10
+ 25 + 9
12 21

4 3 5 2
35. 15 36. 23 37. 3 38. 4
7 5 8 3
11 8 1 2
+ 9 +8 2 9
14 15 6 5
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+7 +3
4 6