81 has 5 factors: 1, 3, 9, 27, and 81.
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Factors of 81 are 1, 3, 9, 27, and 81 Factors of 99 are 1, 3, 9, 11, 33, and 99 The GCF of 81 and 99 is 9
The common factors of 18 and 81 are; 1, 3, and 9. The factors of 18 are; 1, 2, 3, 6, 9, and 18. The factors of 81 are 1, 3, 9, 27, and 81.
The common factors of 72 and 81 are: 1, 3, and 9
81 and 169 share no common factors aside from 1.
The factors of 54 are: 1, 2, 3, 6, 9, 18, 27, 54 The factors of 81 are: 1, 3, 9, 27, 81