Greatest Common Fact

Which of the following is the greatest common factor of 21, 42, and 14?

• 21

• 7

• 14

• 3

Find the GCF of 21 and 28

• 3

• 4

• 7

• 14

Greatest common factor of 10 and 20

• 5

• 2

• 10

Greatest common factors of 9 and 15

• 5

• 4

• 3

Greatest common factor of 6 and 8

• 3

• 4

• 2

Greatest common factor of 8, 10, 12, and 20

• 3

• 4

• 2

• 5

What is the greatest common factor of 8 and 10?

• 1

• 3

• 4

• 2

GCF of 20 and 80

• 10

• 20

• 5

• 40

• Not Given

GCF of 9 and 36

• 3

• 6

• 9

• 12

• Not Given

GCF of 15 and 45

• 3

• 15

• 5

• 30

• Not Given