The factors of 66 are: 1, 2, 3, 6, 11, 22, 33, 66
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The greatest common factor is 2
The GCF is 11.
The GCF of 132 and 198 is 66. The factors of 132 are 2x66=2x2x3x11, The factors of 198 are 198= 3x66=2x11x3x3 The GCF is 66.
You need at least two numbers to find a GCF.
256=2^8, then the factors are 2,22,23,24,25,26,27,28