Factors of 40 = 1,2,20 & 40.
Factors of 80 = 1,2,4,20,40 & 80
Therefore the highest common factor of 40 & 80... is 40
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The GCF is 40.
The greatest common factor would have to be 20.
The GCF of 40 and 72 is 8.
The GCF of 64, 80, and 96 is 16.
Greatest Common Factor of 56 72 and 40 is 8.