Greatest Common Factor

What is the GCF of 36 and 84?

• 4

• 6

• 12

• 18

What is the GCF of 32 and 56?

• 4

• 8

• 16

• 32

Which pair of numbers have a greatest common factor of 2? Select each correct answer.

• 6 and 12

• 4 and 6

• 10 and 2

• 2 and 24

Which pair of numbers have a greatest common factor of 3? Select each correct answer.

• 6 and 9

• 15 and 20

• 3 and 9

• 18 and 15

What is the greatest common factor of 24 and 44?

(a)  

Find the GCF of 12 and 18 using lists.

• 6

• 2

• 3

• 9

Find the GCF of 24 and 36 using the ladder method.

• 6

• 18

• 12

• 30

Find the GCF of 15 and 25 using Venn diagrams.

• 5

• 1

• 10

• 20

Find the GCF of 30 and 45 using the ladder method.

Find the GCF of 20 and 25 using Venn diagrams.

• 5

• 10

• 15

• 2