50 POINTS! HOW DO YOU FIGURE OUT THE GCF? PLZ REPLY ASAP OR ELSE I WILL NOT GIVE YOU BRAINLEST! DO IT QUICK, AND I WILL GIVE YOU BRAINLEST. 10 MINUTES IS THE TIME LIMIT.

Decompose the numbers into their prime factors.

Underline the factors that all the original numbers have in common.

Multiply the underlined numbers to get the GCF.

For example:

Find the greatest common factor of 12 and 20.

Write down all the factor pairs of 12 and 20:

Factor pairs of 12: 1 x 12, 2 x 6, 3 x 4

Factor pairs of 20: 1 x 20, 2 x 10, 4 x 5

The number 4 is the greatest number that appears in both lists of factor pairs, so it’s the GCF.