GCF of Numbers

Find the greatest common factor (GCF) of 12 and 18.

• 3

• 6

• 15

• 9

What is the GCF of 24 and 36?

• 6

• 18

• 12

• 30

Determine the GCF of 15 and 25.

• 3

• 10

• 5

• 20

Calculate the GCF of 40 and 60.

• 10

• 30

• 50

• 20

Find the GCF of 72 and 96.

• 36

• 12

• 24

• 48

What is the greatest common factor of 16 and 24?

• 12

• 8

• 20

• 4

Determine the GCF of 35 and 49.

• 7

• 12

• 42

• 25

Calculate the GCF of 54 and 90.

• 9

• 18

• 27

• 45

Find the GCF of 80 and 120.

• 40

• 20

• 100

• 60

What is the greatest common factor of 63 and 84?

• 105

• 42

• 21

• 7