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By what number should 63 and 462 both be divided to reduce 63/462 to lowest terms in one step?

A7
B9
C21
D3
Answer & Solution
Correct answer: C. 21
63 = 3 x 3 x 7 and 462 = 2 x 3 x 7 x 11, so their greatest common divisor is 21.
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