The factors of 81 are 1, 3, 9, 27, and 81. There is no common factor for a single number; a common factor is a factor of two or more given numbers. The Greatest Common Factor (GCF) is the largest factor common to two or more given numbers. For example, 17 is the GCF of 34, 51, and 102 because it is the largest number that is a factor common to all three numbers.
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The common factors of 72 and 81 are: 1, 3, and 9
81 and 169 share no common factors aside from 1.
The common factors of 81 and 108 are: 1, 3, 9, and 27
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 factors of 81 are 1, 3, 9, 27, and 81. The factors of 36 are 1, 2, 3, 4, 6, 9, 12, 18, and 36. The common factors of 81 and 36 are 1, 3, and 9.