GCF and LCM

What is the Greatest Common Factor of 10 and 21?

• 2

• 12

• 1

• 5

What is the Least Common Multiple of 4 and 14

• 28

• 42

• 56

• 24

What is the Greatest Common Factor of 35 and 49

• 5

• 7

• 1

• 17

What is the Least Common Multiple of 5 and 11?

• 45

• 66

• 25

• 55

What is the Greatest Common Factor of 12 and 48?

• 6

• 12

• 4

• 16

What is the Least Common Multiple of 3 and 4?

• 12

• 24

• 36

• 48

What is the Greatest Common Factor of 35 and 42?

• 5

• 14

• 7

• 3

What is the Least Common Multiple of 10 and 48?

• 240

• 260

• 480

• 140

What is the Greatest Common Factor of 23 and 78?

• 2

• 23

• 1

• 14

What is the Least Common Multiple of 15 and 90?

• 90

• 45

• 180

• 120