61 and 80 don't have a common factor (except 1 which doesn't count).
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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 40, 80, and 128 is 8
The GCF is 8.
The GCF of 32, 80, and 96 is 16.
the GCF or greatest common factor of 45, and 80 is 5
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 100, 80, and 16 is 4.