Prime and Composite Numbers

& Composite NumbersObjective: I can distinguish prime and composite numbers.

Created byKim Balstad/Chris Garrison

Sycamore 5th grade (Revised by Marilyn Higginbotham)

Essential Questions

• What is a prime number? How is it determined?

• What is a composite number? How is it determined?

• Which number is special? How is different from other numbers?

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Essential Vocabulary

• What is a composite number?–It’s a number with more than 2 factors.

Let’s look at an example: Is 24 a composite number?

24 = 1 x 24

24 = 2 x 12

24 = 3 x 8

24 = 4 x 6

24 is a composite number.

The factors of 24 are 1, 2, 3, 4, 6, 8, 12, 24.

24 has more than 2 factors!

Essential Vocabulary• What is a prime number?

–A number with EXACTLY 2 factors (1 and itself)

Let’s look at an example: Is 5 a prime number?

5 = 5 x 1

5 is a prime number.

The factors of 5 are 1 and itself

5 has EXACTLY 2 factors! (1 and 5)

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The number 1!

• Now, let’s talk about the number.

• The number 1 is a special number because it’s not prime or composite.

SPECIALSPECIAL

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Think about it and be ready to share: WHY is the number 1 neither prime or composite?

Partner Share

• Turn to your partner and share facts about each of these new terms.

• What is a composite number? How is it determined?• What is a prime number? How is it determined?• How is the number 1 special? Why?

Get out your SLATES!

Let’s practice what we know!

Is this number prime or composite? Show all work and

carefully find all the factors!

15Composite!

Is this number prime or composite? Show all work and

carefully find all the factors!

9Composite!

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!

1

I am special!

Is this number prime or composite? Show all work and

carefully find all the factors!

27

Composite!

Is this number prime or composite? Show all work and

carefully find all the factors!

23

Prime!

Closure

OUTCOME SENTENCES

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Outcome Sentences

• Today I learned....

• I have a question about.....

• I would still like to know more about.....

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Independent Practice• FACTOR PEOPLE

• Use your student number to create a factor person.

• Remember each factor should go a separate arm or leg.

• Select the correct cap: prime, composite, or special.

• Write a closure sentence describing why your factor person is prime, composite, or special.

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