The GCF is 3.
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Nine is the highest common factor of 81 and 9
The greatest common factor of 81 and 135 is 27.
The GCF is 3.
The highest common factor of 81 and 63 is 9
The factors of 81 are 1,3,9,27,81 The factors of 100 are 1,2,4,5,10,20,25,50,100