Composite and Prime Numbers Concepts

This video tutorial explains the concepts of prime and composite numbers. It defines prime numbers as whole numbers greater than 1 with only two factors: 1 and the number itself. Composite numbers are whole numbers greater than 1 with more than two factors. The video provides examples of both types of numbers and explains how to identify them. It includes practice problems to reinforce the concepts and concludes with additional exercises for further understanding.

Which of the following is a prime number?

• 9

• 7

• 6

• 4

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CCSS.4.OA.B.4

What makes a number composite?

• It is an even number.

• It can be divided by numbers other than 1 and itself.

• It has exactly two factors: 1 and itself.

• It has only one factor.

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CCSS.4.OA.B.4

Why is the number 5 considered a prime number?

• It has only two factors: 1 and 5.

• It can be divided by 2.

• It is a multiple of 3.

• It is an even number.

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CCSS.4.OA.B.4

Which of the following numbers is composite?

• 11

• 19

• 13

• 15

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CCSS.4.OA.B.4

What are the factors of 12 that make it a composite number?

• 1 and 12

• Both 2 and 6, and 3 and 4

• 2 and 6

• 3 and 4

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CCSS.4.OA.B.4

Which number is a prime number?

• 51

• 39

• 23

• 33

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CCSS.4.OA.B.4

What makes 39 a composite number?

• It is divisible by 7.

• It is divisible by 5.

• It is divisible by 3.

• It is divisible by 2.

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CCSS.4.OA.B.4

Which of the following numbers is not a prime number?

• 19

• 37

• 23

• 51

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CCSS.4.OA.B.4

What is the only factorization of 37?

• 3 and 12

• 1 and 37

• 2 and 19

• 5 and 7

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CCSS.4.OA.B.4

How can you determine if a number is prime?

• Check if it is even.

• Check if it has more than two factors.

• Check if it can only be divided by 1 and itself.

• Check if it is a multiple of 10.

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CCSS.4.OA.B.4