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).
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The greatest common factor of 156 , 40 = 4
4 is the answer
It is 4
The GCF is 4.
Since 40 is a factor of 120, all the factors of 40 are common to 120. There can only be one greatest. 1, 2, 4, 5, 8, 10, 20, 40 The GCF is 40.