The GCF of 64 and 81 is 1.
64:1,3,4,8,16,32,64
81:1,3,9,27,81
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The factors of 64 are all 2s and the factors of 81 are all 3s. The greatest common factor is 1, since they have no factors in common. ■
The greatest common factor of 56 and 81 is 1.
The Greatest Common Factor of 81, 108, 117: 9
The GCF of 53 and 81 is 1.
The greatest common factor of 58 and 81 is 1.