Problem:
Estimate to determine which of the following numbers is closest to .205401.
Answer Choices:
A. .2
B. 2
C. 20
D. 200
E. 2000
Solution:
.205401≈.2400=24000=2000 where ≈ means "is approximately equal to".
OR
.205401=.2051×401≈5×400=2000.
Answer: D.
The problems on this page are the property of the MAA's American Mathematics Competitions