Prime Factors, GCF and LCM

Select all numbers that are prime

• 5

• 9

• 12

• 15

• 23

Select all numbers that are composite

• 3

• 10

• 21

• 29

• 35

What is the prime factorization of 42?

• 2 x 3 x 7

• 6 x 7

• 2 x 2 x 3

• 2 x 2 x 3 x 7

What is the prime factorization of 60?

• 5 x 3 x 2 x 2

• 5 x 2 x 2

• 6 x 5 x 2

• 5 x 5 x 2

What is the greatest common factor of 32 and 20

• 5

• 8

• 4

• 10

What is the greatest common factor of 18 and 48?

• 4

• 12

• 8

• 6

What is the least common multiple of 8 and 10?

• 20

• 40

• 32

• 50

What is the least common multiple of 9 and 12?

• 12

• 36

• 48

• 45