Perform term/canonical factorization to get:
54 = 6 * 9
= 2 * 3 * 3²
= 2 * 3³
81 = 9²
= 34
117 = 3 * 39
= 3 * 3 * 13
= 3² * 13
So the only greatest term in common of these numbers is 3².
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The Greatest Common Factor (GCF) of 27, 81, and 54 is 27.
The GCF of 81 and 117 is 9.
The greatest common factor of the numbers 48 and 42 is 6.The GCF is: 6
The Greatest Common Factor of 81, 108, 117: 9
The GCF is: 3