Factors of 15: 1, 3, 5, 15.
Factors of 42: 1, 2, 3, 6, 7, 14, 21, 42.
GCF (15, 42) = 3
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The Greatest Common Factor of 28, 42, 63: 7
The Greatest Common Factor (GCF) is: 6
21 itself is the greatest common integral factor, since 21 X 2 = 42.
The greatest common factor (GCF) is: 14.
Greatest common factor of 42 and 280 is 14.