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49 = 7 * 7

56 = 7 * 2 * 2 * 2

The common factor is 7 -- greatest or least is the same in this case.

greatest common factor of 56 and 49 is 7.

56 = 7 * 2 * 2 * 2

49 = 7 * 7 7 56 / 49 = 1 r 7

49 / 7 = 7 r 0

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Q: What is the greatest common factor of 49 and 56?
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