The factors of 21 are:
1, 3, 7, 21
The factors of 63 are:
1, 3, 7, 9, 21, 63
The common factors are:
1, 3, 7, 21
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The Greatest Common Factor of 21, 63, 84: 21
The greatest common factor of 63, 84, and 105 is 21.
The GCF is 21.
The GCF of 21, 56, 63, and 84 is 7.
The GCF is 21.