The GCF is 6.
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The greatest common factor is 14
The Greatest Common Divisor (GCD) for 12 36 42 is 6.
Factors of 28... 1,2,4,7,14,28 Factors of 42... 1,2,3,6,7,14,21,42 GCF = 14
42 - 1,2,3,6,7,42 54 - 1,2,3,6,9,54
The greatest common factor of 42 and 56 is 14.