Prime and Composite Review

Composite numbers:

• Are always bigger than prime numbers
• Have more than 2 factors
• Have 2 pairs of factors
• Don't have factors

Find the prime number.

• 10
• 9
• 7
• 4

Is 3 a factor of 12?

• yes
• no

Is 12 prime or composite?

• prime
• composite

is 5 prime or composite?

• prime
• composite

What are all prime numbers divisible by?

• 1, 2, and itself
• 1 and itself
• Every number from 1-10
• They aren't divisable at all

Besides 15 and 1, what is one factor of 15?

• 2
• 4
• 6
• 3

Which answer choice lists all the factors for 27?

• 3, 9
• 1, 3, 9, 27
• 1, 3, 6, 9, 12, 27
• 1, 3, 6, 9, 18, 27

Which of the following is NOT true about prime numbers? 

• They have exactly two factors 
• 1 is a factor of every prime number
• No prime numbers end in zero
• All prime numbers are odd numbers.  

What do we call the answer to a multiplication question?

• sum
• difference
• quotient
• product