20
4*20 = 80
5*20 =100
The GCF is 20.
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The greatest common factor of 18 and 100 is 2
The greatest common factor of 100 and 275 is 25.
The greatest common factor of 41 , 100 = 1
Get the greatest common factor first. For example, you might use Euclid's Algorithm - the first step is that the greatest common factor of 5030 and 100 is the same as the greatest common factor of 100 and 30 (where 30 is the remainder of the division of 5030 / 100). Once you get the greatest common factor, the common factors of the two numbers are simply all the factors of this greatest common factor.
The greatest common factor of 54 and 100 is 2.