GCF LCM Prime Factorization

What is the GCF of 20 and 30?

• 5

• 2

• 10

• 20

What is the GCF of 18 and 24?

• 3

• 6

• 8

• 9

GCF of 8 and 20

• 8

• 2

• 4

• 10

What is the least common multiple (LCM) of 6 and 8?

• 6

• 8

• 48

• 24

Using prime factorization, find the GCF of 81 and 108.

• 9

• 27

• 54

• 81

Using prime factorization, find the GCF of 60 and 48.

• 6

• 12

• 24

• 4

Complete the prime factorization by labeling the black boxes.

c

b

a

126

7

3

Match the prime factorization to each number.

• 81

• 
• 111

• 
• 200

• 
• 26

• 
• 1000

• 

Find the Least Common Multiple (LCM) of 4 & 14.

• 14

• 20

• 28

• 42

Use a number tree to find the prime factorization of 48

• 4x2x6

• 4x2²x3

• 3x2⁴

• 12x4