Difference between revisions of "1991 AJHSME Problems/Problem 3"

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Revision as of 00:06, 5 July 2013

Problem

Two hundred thousand times two hundred thousand equals

$\text{(A)}\ \text{four hundred thousand} \qquad \text{(B)}\ \text{four million} \qquad \text{(C)}\ \text{forty thousand} \qquad \text{(D)}\ \text{four hundred million} \qquad \text{(E)}\ \text{forty billion}$

Solution

Writing the numbers in scientific notation, we have \begin{align*} (2\times 10^5)\times (2\times 10^5) &= 4\times 10^{10} \\ &= 40\times 10^9 \\ &= \text{forty billion} \rightarrow \boxed{\text{E}}. \end{align*}

See Also

1991 AJHSME (ProblemsAnswer KeyResources)
Preceded by
Problem 2
Followed by
Problem 4
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
All AJHSME/AMC 8 Problems and Solutions

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