Problem:
Betty used a calculator to find the product . She forgot to enter the decimal points. The calculator showed . If Betty had entered the decimal points correctly, the answer would have been
Answer Choices:
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B.
C.
D.
E.
Solution:
Although one could solve this problem by counting decimal places in the product, it is more more insightful to realize that the answer is approximately , so is correct.
Answer: .
The problems on this page are the property of the MAA's American Mathematics Competitions