Common Factors Challenge

What are the factors of 12?

• 5

• 7

• [1, 2, 3, 4, 6, 12]

• 10

List all the factors of 18.

• 2, 3, 5, 6, 9, 18

• 1, 2, 4, 6, 9, 12

• [1, 2, 3, 6, 9, 18]

• 1, 3, 5, 7, 9, 18

Identify the common factors of 8 and 12.

• 2, 6, 8

• 1, 3, 5

• 3, 9, 12

• 1, 2, 4

What is the greatest common factor (GCF) of 15 and 25?

• 10

• 15

• 25

• 5

Find the GCF of 24 and 36.

• 18

• 6

• 24

• 12

List the prime factors of 30.

• 2, 4, 6, 8

• [2, 3, 5]

• 3, 5, 7, 11

• 1, 2, 3, 5

What are the common prime factors of 14 and 21?

• 5

• 7

• 3

• 9

If a number is divisible by both 4 and 6, what are its common factors?

• 1, 2, 3, 4, 6, 12

• 2, 4, 8, 16, 20

• 1, 2, 5, 10, 15

• 3, 5, 7, 9, 11

What is the GCF of 48 and 60?

• 12

• 36

• 24

• 30

Identify the common factors of 20 and 30.

• 1, 2, 5, 10

• 4, 8, 12, 16

• 5, 10, 20, 25

• 3, 6, 15, 30