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The GCF is 1.
1.
Factors of 20: 1, 2, 4, 5, 10, 20.Factors of 63: 1, 3, 7, 9, 21, 63.GCF (20, 63) = 1
The GCF is: 63
The GCF is 21.
The GCF is 9.
The GCF is 63.
The GCF is 7.