Prime Factorization GCF LCM Compare Round Fractions

Find the GCF:

• 1

• 2

• 8

• 12

Answer the following question by finding the GCF.

• 18

• 9

• 12

• 1

What would be the EXPANDED prime factorization of the number 18?

• 2 x 3 x 3

• 3 x 6

• 2 x 9

• 2 x 3

What would be the prime factorization of the number 75?

• 5 x 5 x 5

• 3 x 3 x 5

• 3² x 5

• 3 x 5²

What is the GCF (Greatest Common Factor) of 12 and 6?

• 1

• 6

• 2

• 3

Complete the prime factorization by labeling the black boxes.

c

b

a

126

3

7

GCF of: 
14 and 20

• 7

• 28

• 2

• 6

GCF of 36 and 60

What is the greatest common factor (GCF) of 20 and 30?

• 5

• 2

• 10

• 20

What is the GCF of 56 and 49?

• 14

• 2

• 8

• 7