The common denominator of any two or more whole numbers will always be 1.
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The Greatest Common Factor of 40 and 250 is 10.
1 and 5
The GCF is 5.
The greatest common factor of 20, 21, and 25 is 1. Although 20 and 25 can be divisible by 5, 21 can not. Therefore, the only common factor between these three numbers is 1 and it's the greatest one as well.
There can be only one greatest common factor for any set of numbers. GCF(40, 20) = 20.