What is the greatest common factor of 5 and 28?

Answer 1

To find the greatest common factor (GCF) of 5 and 28, we start by determining the factors of each number.

The factors of 5 are:

• 1, 5

The factors of 28 are:

• 1, 2, 4, 7, 14, 28

Now, we look for the common factors between these two sets of factors. The only factor that appears in both lists is:

• 1

Therefore, the greatest common factor of 5 and 28 is:

\[ \boxed{1} \]