The GCF is 10.
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The Greatest Common Factor (GCF) of 20, 24, and 60 is 4
The greatest common factor of 12 and 20 is 4
greatest common factor of 200 and 180 is 20.
The GCF is 1.
The greatest common factor of 20, 21, and 25 is 1. Although 20 and 25 can be divisible by 5, 21 can not. Therefore, the only common factor between these three numbers is 1 and it's the greatest one as well.