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.
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It is: 3
The greatest common factor of 56 and 81 is 1.
The Greatest Common Factor of 81, 108, 117: 9
The GCF of 53 and 81 is 1.
The greatest common factor of 58 and 81 is 1.