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# How do you determine if a number is a prime or composite number?

How do you determine if a number is a prime or composite number?. For example: Is 15 a prime or composite number?. You will learn how to determine if a number is prime or composite number by using area models. Multiplication can be shown as an area model. 2. x. 3. x. =. 3. 2.

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## How do you determine if a number is a prime or composite number?

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1. How do you determine if a number is a prime or composite number? For example: Is 15 a prime or composite number?

2. You will learn how to determine if a number is prime or composite number by using area models.

3. Multiplication can be shown as an area model. 2 x 3 x = 3 2

4. Not all odd numbers are prime numbers. 5 is ODD & a prime 9 is ODD & is NOT prime

5. A prime number has ONLY one set of factor pairs (1 and itself). 3x3 1x9 1x5 composite prime 9: 5:

6. Is 15 a prime or composite number? 15: 1 x 15 3 x 5

7. In this lesson you have learned how to determine if a number is prime or composite by using area models.

8. 17 Prime or Composite? 1 x 17= 17

9. Look at these numbers: 10, 11, and 12 • Which ones are prime? • Which ones are composite?

10. Is 81 a prime or composite number? How do you know?

11. What other strategies can you use to find out if a number is prime or composite?

12. 16: Prime number or Composite number? Find all the factor pairs for 13. Then decide if it is a prime or composite number.

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