The factors of 81 are: 1, 3, 9, 27, 81.
The factors of 30 are: 1, 2, 3, 5, 6, 10, 15, 30.
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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
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 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. ■
The common factors of 27 and 81 are: 1, 3, 9, and 27
Factors of 60 are: 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, and 60.1 + 20 + 30 = 51