GCD: 14
LCM: 280
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56 and 40's highest common factor is eight.
It is: 14
The GCF is 14.
Since 7 is a factor of 56, it is automatically the GCF.
The factors of 56 are 1, 2, 4, 7, 8, 14, 28, and 56, so the highest factor is 56.