how do you determine if a number is a prime or composite number?

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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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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. - PowerPoint PPT Presentation

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Page 1: 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?

Page 2: How do you determine if a number is a prime or composite number?

You will learn how to determine if a number is prime or

composite number by using area models.

Page 3: How do you determine if a number is a prime or composite number?

Let’s Review

2x 3

=x 2

3

Multiplication can be shown as an area model.

Page 4: How do you determine if a number is a prime or composite number?

A Common Mistake

Not all odd numbers are prime numbers.

5 is ODD & a prime9 is ODD & is NOT prime

Page 5: How do you determine if a number is a prime or composite number?

Core LessonA prime number has ONLY one set of factor

pairs (1 and itself).

5:

1x59:

1x9

3x3

prime composite

Page 6: How do you determine if a number is a prime or composite number?

Core LessonIs 15 a prime or composite number?

15: 1 x 15

3 x 5

Page 7: How do you determine if a number is a prime or composite number?

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

area models.

Page 8: How do you determine if a number is a prime or composite number?

Guided Practice17

Prime or Composite?

1 x 17= 17

Page 9: How do you determine if a number is a prime or composite number?

Extension Activities

Look at these numbers: 10, 11, and 12

Which ones are prime?

Which ones are composite?

Page 10: How do you determine if a number is a prime or composite number?

Extension Activities

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

Page 11: How do you determine if a number is a prime or composite number?

Extension Activities

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

Page 12: How do you determine if a number is a prime or composite number?

Extension Activities

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

Page 13: How do you determine if a number is a prime or composite number?

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.