32 and 81 have no common factors aside from 1. Therefore the GCF is just 1.
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There is no GCF of 32 and 81 because no prime numbers go into either 32 or 81
The GCF is 2.
81, as it is the highest factor of 81 (81 and 1) and is also a factor of 162 (81 and 2)
The greatest common factor of 36, 81 and 18 is 9
The Greatest Common Factor (GCF) of 27, 81, and 54 is 27.