The answer is 9.
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The GCF is 9.
9
The GCF of 81 and 117 is 9.
The GCF is 9.
The GCF is 9.
The GCF is 9.
The GCF is 9.
The GCF is 9.
The GCF is 9.
It is: 9
45 = 5 x 9, 117 = 13 x 9. 5 and 13 are co-prime so GCF is 9.
The GCF is 9.