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Anonymous
21 and 42 have a GCF of 21.
40 and 80 have a GCF of 40.
The GCF of 21 and 40 is 1.
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They are 21 and 42
40 and 80, among others.
The GCF of these numbers is 40.
The GCF is 1.
The GCF is 2.
The greatest common factor of the numbers 96 and 40 is 8.