12 = 2 x 2 x 3; 20 = 2 x 2 x 5; 32 = 2 x 2 x 2 x 2 x 2.
Common factors = 2 x 2 so HCF = 4
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the greatest common factor of 20 and 100 is:20
The greatest common factor (GCF) of 20 and 30 is 10.
The greatest common factor of 20 and 26 is 2
The GCF of 12, 20, 24, and 32 is 4
The greatest common factor of 20 and 32 is 4.