9
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The GCF is 9.
Factors of 81: 1, 3, 9, 27, 81.Factors of 108: 1, 2, 3, 4, 6, 9, 12, 18, 27, 36, 54, 108.Factors of 135: 1, 3, 5, 9, 15, 27, 45, 135.GCF (81, 108, 135) = 27
The GCF is 54.
GCF of 108 and 360 is 36.
The GCF of 27 and 81 is 27. And their LCM is 81.