Understanding Prime and Composite Numbers

What is a prime number?

• Any odd number.

• A number that is divisible by 2.

• A number with more than two factors.

• A number with exactly two factors: 1 and the number itself.

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CCSS.4.OA.B.4

What makes a number composite?

• It cannot be divided by any number.

• It is a prime number.

• It is divisible by numbers other than 1 and itself.

• It has only one factor.

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CCSS.4.OA.B.4

What are the factors of a prime number?

• Only the number 1

• 1, the number itself, and more

• Prime numbers do not have factors

• 1 and the number itself

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CCSS.4.OA.B.4

Is 6 a prime or composite number?

• Composite

• Both

• Prime

• Neither

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CCSS.4.OA.B.4

Which of the following is a prime number?

• 24

• 7

• 9

• 4

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CCSS.4.OA.B.4

Which of these is NOT a characteristic of a composite number?

• Can be an odd number.

• Can be an even number.

• Is divisible by 1 and itself only.

• Has more than two factors.

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CCSS.4.OA.B.4

How many prime numbers are in the list of 4 in example 6?

• Three

• None

• Two

• One

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CCSS.4.OA.B.4

Which of the following numbers is composite?

• 29

• 5

• 13

• 33

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CCSS.4.OA.B.4

What is special about the number 2 in terms of prime numbers?

• It is the only even prime number.

• It is the smallest prime number.

• It has three factors.

• It is a composite number.

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CCSS.4.OA.B.4

Is 21 considered a prime or composite number?

• Composite

• Prime

• Neither

• Both

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CCSS.4.OA.B.4