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The gcf(42, 18) is not 12, it is:

42 = 2 x 3 x 7 = 6 x 7

18 = 2 x 3 x 3 = 6 x 3

gcf = 2 x 3 = 6

The factors of 42 are: 1, 2, 3, 6, 7, 14, 21, 42

The factors of 18 are: 1, 2, 3, 6, 9, 18

The common factors of 42 and 18 are: 1, 2, 3, 6; of which the greatest is 6.

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Q: Why is the greatest common factor of 42 and 81 12?
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