Math 2nd Quarter Reviewer

Which of the following numbers is a prime number?

• 21

• 15

• 18

• 23

What is the smallest prime number?

• 2

• 0

• 1

• 3

Which is the set of composite numbers?

• 51, 55, 57

• 33, 35, 37

• 41, 43, 45

• 21, 23, 25

What are the factors of 30?

• 1, 2, 4, 5, 10, 30

• 1, 2, 10, 30

• 1, 2, 3, 5, 6, 10, 15, 30

• 1, 2, 3, 4, 5, 6, 10, 15, 30

Which number does not have 12 as a factor?

• 36

• 70

• 48

• 24

What number has a prime factorization of 2 x 2 x 2 x 5?

• 20

• 30

• 40

• 50

What are the prime factors of 32?

• 2 x 2 x 2 x 2 x 2

• 2 x 2 x 2 x 2 x 3

• 2 x 2 x 2 x 3

• 2 x 2 x 2 x 2

Which prime factorization is not correct?

• 2 x 3 x 11

• 2 x 3 x 4

• 2 x 3 x 7

• 2 x 3 x 5

Which is not a factor of 56?

• 4

• 5

• 6

• 7

What is the GCF of 40 and 60?

• 5

• 10

• 15

• 20