You need at least two numbers to find a GCF. If that's 6 and 15, the GCF is 3.
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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 180 and 231 is 3
The greatest common factor of 315 and 660 is 15.
The GCF of 18 and 315 is: 9
The GCF is 63.
The greatest common factor of 315 and 225 is 45.