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 80 and 128 is 16
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The GCF of 64, 80 and 128 is 16.
16
The greatest common factor of 54 and 80 is 2
The greatest common factor of 80 and 120 is 40.
The greatest common factor of 25 and 80 is 5.