The factors of 45 are:
1, 3, 5, 9, 15, 45
The factors of 54 are:
1, 2, 3, 6, 9, 18, 27, 54
The factors of 72 are:
1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72
The common factors are:
1, 3, 9
The Greatest Common Factor (GCF) is:
9
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The GCF is 9.
The GCF is 18.
The GCF is 9.
The GCF is 9.
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.