STAAR Release Questions Prime and Composite

What is the prime factorization of 20?

• 2 x 5 x 5

• 4 x 5

• 2 x 10

• 2 x 2 x 5

What is the prime factorization of 130?

• 13 x 10

• 110 + 20

• 5 x 3

• 2 x 5 x 13

Which of the following is the prime factorization of 42?

• 7 x 6

• 2 x 3 x 7

• 23 x 7

• 6 x 7

Why is 6 x 11 NOT prime factorization of 66?

• 6 x 11 is not prime factorization because it does not equal 66.

• 6 x 11 is not prime factorization because 6 is a prime number.

• 6 x 11 is not prime factorization because 6 is a composite number.

• 6 x 11 is not prime factorization because 11 is a prime number.

Which is the prime factorization of 12? 

• 2 x 6
• 2 + 2 + 2 + 2 + 2 + 2 
• 2² x 3
• 1 x 2² x 3

If the expanded form is 2⋅2⋅2⋅3⋅3⋅5⋅7 what would the exponential form be?

• 2⋅3⋅5⋅7
• 2³⋅3²⋅5⋅7
• 2²⋅3²⋅5⋅7
• 8⋅9⋅35

Create a factor tree and find the prime factorization for 80

• 2⁴⋅5
• 4²⋅5
• 2⋅2⋅2
• 8⋅5⋅2

Which of the following are all prime numbers

• 2, 3, 6, 7, 9
• 2, 4, 8, 16
• 2, 3, 5, 7, 9
• 2, 3, 5, 7, 11

Which of these is NOT a factor of 36?

• 2
• 8
• 12
• 6