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Published byTerence Gilmore Modified about 1 year ago

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

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

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Let’s Review 2 x 3 = x 2 3 Multiplication can be shown as an area model.

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A Common Mistake Not all odd numbers are prime numbers. 5 is ODD & a prime 9 is ODD & is NOT prime

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Core Lesson A prime number has ONLY one set of factor pairs (1 and itself). 5:5: 1x51x5 9:9: 1x91x9 3x33x3 prime composite

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Core Lesson Is 15 a prime or composite number? 15: 1 x 15 3 x 5

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

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Guided Practice 17 Prime or Composite? 1 x 17= 17

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Extension Activities Look at these numbers: 10, 11, and 12 Which ones are prime? Which ones are composite?

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

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

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Can a multiple of a number be a prime number? Explain your thinking.

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Quick Quiz 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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