Greatest Common Factor Review

Which is a factor of 15?

• 2

• 3

• 4

• 6

GCF of 20 and 35

• 4
• 5
• 7
• 20

List all the factors of 12

• 1, 2, 3, 4, 6, 12
• 1, 2, 4, 12
• 1, 12
• 1, 2, 3, 4, 5, 6, 12

What is the GCF of 4 and 12?

• 3
• 1
• 6
• 4

What is the greatest common factor of 8 and 10?

• 1
• 3
• 4
• 2

What is the greatest common factor of 6 and 21?

• 6
• 2
• 3
• 7

Find the greatest common factor of 20 and 30.

• 2

• 5

• 10

• 15

What are the factors of 25?

• 1, 2, 3, 5, 10, 15, 25
• 1, 5,  25
• 1, 25
• 1, 5

Find the missing multiple.

10: 10, 20, 30, 40, ___, 60, 70, 80

• 100

• 45

• 50

Which number is NOT a multiple of 2?

• 5

• 4

• 6

• 8