Prime or Composite? Factors or Multiples? Objective: I can differentiate between prime and composite numbers. I can differentiate between factors and multiples.

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Presentation transcript:

Prime or Composite? Factors or Multiples? Objective: I can differentiate between prime and composite numbers. I can differentiate between factors and multiples. Created by Chris Garrison Sycamore 5th grade

What are... Prime Numbers? have “exactly two factors” 1 and itself Composite Numbers? have more than two factors

Multiples are BIG! Factors are small

Let’s practice what we know! Get Ready!

Is this number prime or composite? Show all work and carefully find all the factors! 16 Composite !

Is this number prime or composite? Show all work and carefully find all the factors! 24 Composite !

Is this number prime or composite? Show all work and carefully find all the factors! 17 Prime !

Is this number prime or composite? Show all work and carefully find all the factors! 64 Composite !

Test for success! Think smarter not harder! Which of following are all prime numbers? a. 2, 3, 5, 7, 9, 13, b. 1, 4, 5, 7, 11, 13, c. 3, 5, 7, 13, 17, 19 Example Tip Eliminate composite numbers first. X X Then double check remaining numbers to make sure they are all prime. X X