The greatest common factor of 21 and 63 is 21.Since 21 is a factor of 63, it is automatically the GCF.
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3The GCF is: 2121.The GCF is 21.
The GCF is 21.
The GCF is 21.
The GCF of 21, 35, and 63 is 7.
The Greats Common Factor (GCF) is 21 63: 1,3,7,9,21,63 42: 1,2,3,67,14,21,42 21: 1,3,7,21 They all number 21 listed in there the Factors