The GCF of 158 and 256 is 2. This leaves 79 and 128 remainder after division respectively. There is actually no other common factor aside from 1 between them as 79 is prime and doesn't go into 128.
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The GCF of 255 and 256 is 1.
Since 32 is a factor of 256, it is automatically the GCF.
It is: 1
The greatest common factor of 286 and 251 is 1.
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