256=2^8, then the factors are 2,22,23,24,25,26,27,28
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You need at least two numbers to find a GCF.
The factors of 256 are: 1, 2, 4, 8, 16, 32, 64, 128, 256 The factors of 400 are: 1, 2, 4, 5, 8, 10, 16, 20, 25, 40, 50, 80, 100, 200, 400 The common factors are: 1, 2, 4, 8, 16 The Greatest Common Factor: GCF = 16
2 and 17
Well, well, well, aren't we feeling all mathematical today? The greatest common factor of 16 and 256 is 16. It's like finding out you have a favorite child - sorry 256, but 16 takes the cake this time.
In the list of common factors, the greatest is the largest, the least is the smallest (which is always 1)