Fundamentals of Mathematics, 2008a

486 CHAPTER 8. TECHNIQUES OF ESTIMATION
321 and 293 cluster near 300. Their sum is about 2 · 300 = 600.
Thus, 706 + 321 + 293 + 684 is about
(2 · 700) + (2 · 300) = 1, 400 + 600
= 2, 000
In fact, 706 + 321 + 293 + 684 = 2,004.
8.3.1.2 Practice Set A
Use the clustering method to estimate each sum.
Exercise 8.3.1 (Solution on p. 506.)
28 + 51 + 31 + 47
Exercise 8.3.2 (Solution on p. 506.)
42 + 39 + 68 + 41
Exercise 8.3.3 (Solution on p. 506.)
37 + 39 + 83 + 42 + 79
Exercise 8.3.4 (Solution on p. 506.)
612 + 585 + 830 + 794
8.3.2 Exercises
Use the clustering method to estimate each sum. Results may vary.
Exercise 8.3.5 (Solution on p. 506.)
28 + 51 + 31 + 47
Exercise 8.3.6
42 + 19 + 39 + 23
Exercise 8.3.7 (Solution on p. 506.)
88 + 62 + 59 + 90
Exercise 8.3.8
76 + 29 + 33 + 82
Exercise 8.3.9 (Solution on p. 506.)
19 + 23 + 87 + 21
Exercise 8.3.10
41 + 28 + 42 + 37
Exercise 8.3.11 (Solution on p. 506.)
89 + 32 + 89 + 93
Exercise 8.3.12
73 + 72 + 27 + 71
Exercise 8.3.13 (Solution on p. 506.)
43 + 62 + 61 + 55
Exercise 8.3.14
31 + 77 + 31 + 27
Exercise 8.3.15 (Solution on p. 507.)
57 + 34 + 28 + 61 + 62
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