Prime or Composite? Factors or 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

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

Factors are small Multiples are BIG!

Let’s practice what we know! Get Ready! Let’s practice what we know!

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

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

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

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

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

Is this number a factor or a multiple of 9? Prove it! 27 Multiple

Is this number a factor or a multiple of 36? Prove it! 12 Factor

Is this number a factor or a multiple of 18? Prove it! 6 Factor

Is this number a factor or a multiple of 7? Prove it! 49 Multiple

Is this number a factor or a multiple of 24? Prove it! 8 Factor

Is this number a factor or a multiple of 12? Prove it! 96 Multiple

Greatest Common Factor (GCF) The greatest factor two numbers share. 1. List the factors for each number. 2. Circle common factors. 3. Choose the greatest factor. 30: 1, 2, 3, 5, 6, 10, 15, 30 GCF = 15 15: 1, 2, 3, 5, 15

Least Common Multiple LCM: 6 Least multiple that more than one number share. 1. List the first 5 multiples of each number. 2. Choose the smallest multiple they both share. LCM: 6 2: 2, 4, 6, 8, 10 3: 3, 6, 9, 12, 15

Tips Test for success! Factor Rainbow 1, 2, 3, 4, 6, 8, 12, 24 Think smarter not harder! Example Which of following are the factors of 24? a. 1, 2, 3, 4, 6, 8, 12, 24 b. 1, 4, 6, 5, 8, 12, 24, X X c. 2, 3, 6, 8, 12, 24, 48 X Tips 1, 2, 3, 4, 6, 8, 12, 24 Double check all factors with... Eliminate any answer choice that includes a multiple. Factor Rainbow

Now tell them the difference between prime and composite number. Closure Turn to your shoulder partner and tell them the difference between a factor and multiple. Now tell them the difference between prime and composite number.