Factors of Numbers

Which of the following is a factor of 8?

• 3

• 5

• 4

• 7

Which is not a factor of 21?

• 1

• 3

• 6

• 7

Which number is a factor of 27?

• 7

• 8

• 9

• 5

Which are the factors of 14?

• 1,14

• 1, 2, 7, 14

• 2, 7

Which number has 2 as a factor?

• 13

• 21

• 26

• 33

Use a factor tree to find prime factorization of 24.

• 2 x 3 x 2 x 3

• 2 x 3 x 2 x 2

• 6 x 2 x 2

• 2 x 3 x 4

What is the prime factorization of 15?

• 3x3x3

• 2x2x5

• 15

• 3x5

What is the missing factor?

• 3

• 5

• 6

• 7

Which number is NOT a factor of 10?

• 1

• 2

• 3

• 5

What are all the factors for the number 18?

• 1, 2, 3, 4, 5, 6, 8, 10

• 1, 2, 3, 6, 9, 18

• 1, 2, 9, 18

• 2, 3, 6, 9, 18