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. ■
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The GCF of 64 and 81 is 1. 64:1,3,4,8,16,32,64 81:1,3,9,27,81
1, 2, 4, 8, 16, 32, 64 1, 3, 9, 27, 81
The least common multiple of the numbers 54, 81 and 135 is 810.
They are 3 and 2835 respectively
You need at least two numbers to find something in common between them.