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
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Factors of 30: 1, 2, 3, 5, 6, 10, 15 and 30.Factors of 81: 1, 3, 9, 27 and 81.Common factors are 1 and 3. But 3 is greater than 1 so, GCF(30, 81) = 3.
The factors of 81 are: 1, 3, 9, 27, 81. The factors of 30 are: 1, 2, 3, 5, 6, 10, 15, 30.
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 factors of 81 are: 1, 3, 9, 27, 81The factors of 90 are: 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90The common factors are: 1, 3, 9
The common factors of 81 and 135 are: 1, 3, 9, and 27