The Greatest Common Factor (GCF) is: 7
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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.
The common factors of 21, 42, and 56 are: 1 and 7
The GCF of 56 and 96 is 8.
The factors of 21 are: 1, 3, 7, 21. The factors of 56 are: 1, 2, 4, 7, 8, 14, 28, 56.
The GCF is 7.