Factors of 42: 1 2 3 6 7 14 21 42 Factors of 60: 1 2 3 4 5 6 10 12 15 20 30 60 The GCF of 42 and 60 is 6
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The GCF of 42, 60 and 78 is 6. You are left with 7, 10 and 13 respectively after division. There are no further factors in common (aside from 1).
The GCF is 3.
The GCF is 7.
The GCF is 2.
The GCF is 7.7 is the GCF of 42, 49 and 84.