The GCF is: 8
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The greatest common factor(gcf) of 64 and 40 is 8. The factors of 40 are 2, 2, 2 and 5 The factors of 64 are 2, 2, 2, 2, 2, and 2 So the highest common factor will have no fives and three 2s = 2 x 2 x 2 = 8
The greatest common factor is 4
The common factors of 40 and 64 are: 1, 2, 4, and 8The highest common factor is 8.
The factors of 40 are 1, 2, 4, 5, 8, 10, 20 and 40 64 is not divisible by 10, 20 or 40. So 8 is the greatest common factor of 40 and 64. Then testing 8 against 96, we find that it is a factor (8 x 12 = 96) Therefore 8 is the greatest common factor of these three numbers.
64 and 16's highest common factor is 16.