8
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The GCF is: 8
It is 4
The greatest common factor of 156 , 40 = 4
Since 40 is a factor of 280, it is automatically the GCF.
its like 14 and 10. the greatest common factor is 2 because 2 fits into both numbers. another one is like 32 and 40 the greatest common factor is 8 because there is no number higher that can fit into both numbers