Answer
estimated = 42
rounding off = 42.03
Work Step by Step
After rounding off the estimate is simplified as
$\frac{0.2 * 105}{0.5}$ = 42
The actual calculation is $\frac{0.19996 * 107}{0.509}$ = 42.03
Thinking Mathematically (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0321867327
ISBN 13:
978-0-32186-732-2
Chapter 1 - Problem Solving and Critical Thinking - 1.2 Estimation, Graphs, and Mathematical Models - Exercise Set 1.2 - Page 26: 35
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