The greatest common factor (GCF) is often also called the greatest common divisor (GCD) or highest common factor (HCF). Keep in mind that these different terms all refer to the same thing: the largest integer which evenly divides two or more numbers.
The greatest common factor of 20 and 125 is 5
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Factors of 135: 1, 3, 5, 9, 15, 27, 45, 135
Factors of 125: 1, 5, 25, 125
GCF (135, 125) = 5
The greatest common factor of 15 and 105 is 15.
Since 15 is a factor of 60, it is automatically the GCF.
The greatest common factor (GCF) is: 5.
Since 5 is a factor of 15, it is automatically the greatest common factor of the pair.
The greatest common factor is one.