You need at least two numbers to find a GCF.
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The greatest common factor of 147 and 36 is 3.
There is no greatest common multiple since numbers keep going on forever. The greatest common factor is 7. The least common multiple is 147
Just look for common factors, and divide both numbers by that common factor.7 is a common factor, so 77/147 = 11/21.
The Greatest Common Factor (GCF) is: 1
The Greatest Common Factor (GCF) is: 6