The factors of 15 are: 1, 3, 5, 15
The factors of 45 are: 1, 3, 5, 9, 15, 45
The common factors are: 1, 3, 5, 15
The Greatest Common Factor (GCF) is: 15
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The greatest common factor of 15, 45 and 100 is 5.
The greatest common factor of the numbers 45, 75 and 90 is 15.
15
The GCF is 15.
The greatest common factor of 45 and 320 is 5.