Greatest Common Factor

Check all the common factors of 9 and 18.

• 1

• 3

• 18

• 2

• 9

What is the GCF of 20 and 30?

• 5

• 10

• 2

• 20

What is the Greatest Common Factor of 9 and 36?

• 3 x 3 x 2 x 2 = 36

• 3 x 3 x 2 = 18

• 3 x 3 x 3 = 27

• 3 x 3 = 9

Use the picture attached to find ALL errors.

SELECT ALL THAT APPLY!!!

• There are no errors.

• The factoring is incorrect for 32.

• The factoring is incorrect for 28.

• The greatest common factor is 8.

Use the picture attached to find ALL errors.

SELECT ALL THAT APPLY!!!

• There's no error.

• The 15 should have been a 5.

• The GCF is 25.

• The 30 should have been a 6.

John has 12 apples and 16 kiwis. He wants to create some identical fruit plates for breakfast. He also doesn’t want to have any fruits left over.

What is the greatest number of fruit plates that John can create?

• 2

• 4

• 6

• 8

Find the greatest common factor of 16, 18 and 22 using prime factorization.

• 2

• 3

• 11

• 8

Suzie has 24 apples and 36 bags of peanuts.  She wants to make snack packs that have the same number of apples and peanuts in each bag.  What is the greatest number of snack bags she can make?

• 10

• 12

• 11

• 13

Find the GCF of 64 and 144.
Hint-Remember to use your factor trees to help you.

• 8

• 16

• 6

• 2

Find the prime factorization of 81.

• 2x2x7

• 4x4x4

• 2x2x2x5x7

• 3x3x3x3