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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