The GCF or greatest common factor is 3. You can write
54 as 2x32
and 39 as 3x13
Now the GCF is 3 since if we look at the above prime factorizations it is the biggest factor in common.
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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 39 and 45 is 3.
First, find the factors:
39 = 3*13
45 = 3*3*5
The only common factor is 3, so 3 is the gcf.
The Greatest Common Factor of the three numbers is 6.
The greatest common factor of 54, 5, 36, and 45 is 1.
The GCF is 9.
18.18.18.18.18. 18.18.18.
The GCF is 6.