1, 2, 4 and 8
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56 and 40's highest common factor is eight.
The GCF is 8.
The greatest common factor (GCF) of 15, 25, and 40 is 5.
The greatest common factor of 8, 32, 40, and 52 is 4.
The greatest common factor of 56 and 81 is 1.