Greatest Common Factor Practice

What is the greatest common factor of 14 and 21?

• 35

• 42

• 7

• 1

What is the greatest common factor of 4 and 10?

• 20

• 40

• 2

• 4

What is the greatest common factor of 6 and 30?

• 2

• 3

• 6

• 30

What is the GCF of 9 and 15?

• 1

• 3

• 9

• 45

What is the greatest common factor of 20 and 35?

• 2

• 140

• 5

• 10

What is the greatest common factor of 50 and 30?

• 150

• 10

• 15

• 5

What is the greatest common factor of 8, 20, and 28?

• 2

• 4

• 8

• 1

What is the greatest common factor of 8 and 24?

• 2

• 4

• 8

• 24

What is the greatest common factor of 6 and 8?

• 12

• 4

• 24

• 2

What is the greatest common factor of 70 and 42?

• 1

• 7

• 14

• 280