What is the greatest common factor of 21 42 and 56
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The GCF of 21, 42, and 56 is 7.
The factors of 21 are: 1, 3, 7, 21
The factors of 42 are: 1, 2, 3, 6, 7, 14, 21, 42
The factors of 56 are: 1, 2, 4, 7, 8, 14, 28, 56
The common factors are: 1, 7
The Greatest Common Factor (GCF) is: 7