The Greatest Common Factor (GCF) is: 9
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9 is the greatest common factor of 18, 45 and 54.
The greatest common factor of 54 and 80 is 2
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.
The greatest common factor of 54 and 90 is 18.
The Greatest Common Factor (GCF) of 36, 54, and 63 is: 9