Greatest Common Factor (GCF)

The prime factorization of 72 is...

• 2 x 2 x 3 x 3 x 3

• 2 x 3 x 5 x 7

• 2 x 3 x 3 x 7

• 2 x 2 x 2 x 3 x 3

What is the GCF of 36 and 45?

• 5

• 6

• 9

• 12

What is the GCF of 28 and 42?

• 4

• 7

• 14

• 28

Find the GCF of 64 and 112.

In a class, there are 15 girls and 10 boys. If they were to break up into groups with even amounts of boys and girls in each group, what is the maximum amount of groups they could make?