Prime Time Review

Which of the following are factors of 12?

• 2

• 6

• 3

• 9

Select the prime numbers.

• 12

• 5

• 7

• 56

Which of the following is not a factor pair of 24?

• $2\times12$

• $4\times6$

• $1\times15$

• $3\times8$

Find the least common multiple of 15 and 30.

• 60

• 30

• 15

• 90

Find the greatest common factor of 15 and 30.

• 3

• 1

• 5

• 15

what is the product of this factor string.  $2\times3\times5^2$  

• 60

• 15

• 150

• 8005

Solve  $5^6$  

• 15

• 30

• 8,945

• 15,625

What is the prime factorization of 240?

• $10\times24$

• $2\times3\times5$

• $2^3\times3\times5$

• $2^4\times3\times5$

Which of the following shows equivalent expressions?

•  $2\times5=6\times2$  

•  $5\times2=6+4$  

•  $3\times2=2+3$  

•  $6\times2=3\times4$  

Select all the odd numbers.

• 5

• 4

• 3

• 9