The common factors are: 1, 3
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The factors of 81 are 1, 3, 9, 27, 81. For them to be common, they need to be compared to another set of factors.
The common factors of 81 and 135 are: 1, 3, 9, and 27
The common factors of 27 and 81 are: 1, 3, 9, and 27
The factors of 30 are: 1, 2, 3, 5, 6, 10, 15, 30 The factors of 81 are: 1, 3, 9, 27, 81 The common factors are: 1, 3
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. ■