GCF, LCM, Prime Factorization

What is the greatest factor of 28 and 49?

• 1

• 2

• 7

• 12

• 48

• 60

• 36

• 72

Which pair of numbers have a GCF of 3?

• 15 and 27

• 20 and 30

• 45 and 15

• 9 and 18

Which pair of numbers has a GCF of 8?

• 8, 36

• 40, 80

• 16, 56

• 24, 42

GCF of 32 and 40

• 2

• 4

• 6

• 8

What is the GCF of 20 and 30?

• 5

• 2

• 10

• 20

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

• 14

• 20

• 28

• 42

What is the GCF of 18 and 24?

• 3

• 6

• 8

• 9

2 x 2 x 2  or 2³ is the prime factorization of

• 6

• 12

• 22

• 8

GCF of 8 and 20

• 8

• 2

• 4

• 10