4 and 8, among others.
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common factors are 1, 2 and 4. 4 is the greatest common factor
The greatest common factor of 8 and 12 is 4.
Common factors are those that can be divided into two different numbers. For 4 and 40, their common factors are: 1, 2, 4, -1, -2, -4. Of these, the largest number is 4 (and this is therefore the greatest common factor).
Greatest Common Factor (GCF) of (4,81) is 1.
The greatest common factor of 156 , 40 = 4