Gcf Basics

What is the GCF of 20 and 30?

• 5

• 2

• 10

• 20

What is the greatest common factor of 6 and 21?

• 6

• 2

• 3

• 7

What is the Greatest Common Factor of 4, 20, and 30?

• 4

• 5

• 3

• 2

What is the Greatest Common Factor of 32, 16, and 24?

• 2

• 4

• 8

• 12

GCF of 13 and 27

• 1

• 7

• 3

• 13

Factor:
18a²-15a

• 15a(3a-1)

• 3a(6a-1)

• 3(6a-5)

• 3a(6a-5)

What is the Greatest Common Factor of 12 and 18?

• 1

• 3

• 6

• 8

What is the GCF of 9 and 15?

• 1

• 3

• 6

• 8

What is the GCF of 12 and 30?

• 2

• 4

• 6

• 8

• 12

Which pair of numbers has a GCF of 8?

• 8, 36

• 40, 80

• 16, 56

• 24, 42