0
factors of 12 - 1 , 2, 3, 4, 6, 12
factors of 18 - 1, 2, 3, 6, 9, 18
factors of 42 - 1, 2, 3, 6, 7, 14, 21, 42
As you can see these are all of the factors of the three numbers. The GCF means the greatest common factor. These three numbers actually have four common factors (1,2,3 and 6) but the number 6 is the greatest so it is labeled the GCF.
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