40 = 2 x 2 x 2 x 5, 37 = 1 x 37.
There is no common factor other than 1.
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The greatest common factor of 156 , 40 = 4
Since 40 is a factor of 280, it is automatically the GCF.
4 is the answer
8
The greatest common factor of 15 and 40 is 5