Problem:
1000×1993×0.1993×10=
Answer Choices:
A. 1.993×103
B. 1993.1993
C. (199.3)2
D. 1,993,001.993
E. (1993)2
Solution:
1000×1993×0.1993×10=((1000×10)×0.1993)×1993=(10,000×0.1993)×1993=1993×1993=(1993)2.
Answer: E.
The problems on this page are the property of the MAA's American Mathematics Competitions