The greatest common factor (GCF) is: 1
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The Greatest Common Factor of 41, 38: 1
56 and 40's highest common factor is eight.
There is only one proper common factor of 12 and 38; it is 2. Mathematicians do not consider 1 to be a proper factor, because it divides everything.
factors: 9: 1,3,9 15: 1,3,5,15 common afctors: 1,3 greatest common factor: 3
64 and 40's highest common factor is eight.