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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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**Prime Numbers? What are... Composite Numbers?**

have more than two factors have “exactly two factors” 1 and itself

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Factors are small Multiples are BIG!

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**Let’s practice what we know!**

Get Ready! Let’s practice what we know!

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**Is this number prime or composite**

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**

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**

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**

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

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**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.

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

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**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

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**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

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**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.

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GCF and LCM Lesson 3.01.

GCF and LCM Lesson 3.01.

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