the greatest common factor is 7,
because 21 divided by 7 is 3,
28 divided by 7 is 4
and 56 divided by 7 is 8.
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The common factors are: 1, 2 The Greatest Common Factor (GCF) is: 2
7
7
The GCF is 7.
Factors of 21: 1, 3, 7, 21.Factors of 308: 1, 2, 4, 7, 11, 14, 22, 28, 44, 77, 154, 308.GCF (21, 308) = 7