The GCF is 15.
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The greatest common denominator, like the greatest common multiple, is infinite.
The Greatest Common Divisor (GCD) for 45 80 is 5.
1, 3, 5, 9, 15, 45 1, 3, 5, 15, 25, 75
The greatest common factor of the numbers 45, 75 and 90 is 15.
450