What is the greatest common factor of 54 and 108?

Answer 1

The GCF of 54 and 108 is 54. Since 54 is a factor of 108, it is automatically the GCF.

You can also write the factors of 54 and 108, and find the one that's highest:

The factors of 54 are 1, 2, 6, 9, 27, and 54

The factors of 108 are 1, 2, 3, 4, 6, 9, 12, 18, 27, 36, 54, and 108

So the GCF (greatest common factor) is 54

Answer 2

Every number is divisible by any non-zero number.
The greatest factor is 108, which is a factor of 108 though not of 54. The greatest COMMON factor is 54.