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9 is the greatest common factor of 36 and 63.

36 = 2 x 2 x 3 x 3 = 2^2 x 3^2

63 = 3 x 3 x 7 = 3^2 x 7

3^2 is the only thing common, so GCF(36,63) is 3^2 = 3 x 3 = 9.
9

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9y ago

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