The GCF of 45 and 54 is 9. The GCF can't be greater than the difference between the numbers, which is 9 in this case. Since 9 is a factor of both 45 and 54, it is the GCF.
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9 is the greatest common factor of 18, 45 and 54.
The Greatest Common Factor (GCF) is: 9
The greatest common factor of 54 and 80 is 2
The greatest common factor of 54 and 90 is 18.
The Greatest Common Factor (GCF) of 36, 54, and 63 is: 9