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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

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

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Multiples are BIG! Factors are small

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Let’s practice what we know! Get Ready!

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

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

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

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

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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

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

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

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

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

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

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

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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 15: 1, 2, 3, 5, 15 GCF = 15

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

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

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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.

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