The greatest common factor, (GCF).
Factors of 54 are 1, 2, 3, 6, 9, 18, 27, and 54.
Factors of 126 are 1, 2, 3, 6,9, 18, 14, 21, 42, 63, and 126.
The GCF is 9.
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The GCF is 6.
The GCF is 18.
The greatest common factor of 54 and 80 is 2
The greatest common factor of 54 and 90 is 18.