63 = 3 x 21 = 32 x 7
42 = 6 x 7 = 2 x 3 x 7
Common factors are 3 x 7.
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1, 2, 3, 6, 7, 9, 14, 18, 21, 42, 63, 126.
1, 2, 3, 6, 7, 9, 14, 18, 21, 42, 63 and 126.
1 and 3 can go into 12 and 63.
42 / 63 = 66.666666666667%
The GCF is 21.