how do you determine if a number is a prime or composite number?
DESCRIPTION
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 PresentationTRANSCRIPT
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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?
![Page 2: How do you determine if a number is a prime or composite number?](https://reader036.vdocuments.net/reader036/viewer/2022062520/56815b5a550346895dc93ff1/html5/thumbnails/2.jpg)
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?](https://reader036.vdocuments.net/reader036/viewer/2022062520/56815b5a550346895dc93ff1/html5/thumbnails/3.jpg)
Let’s Review
2x 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 prime9 is ODD & is NOT prime
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Core LessonA prime number has ONLY one set of factor
pairs (1 and itself).
5:
1x59:
1x9
3x3
prime composite
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Core LessonIs 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 Practice17
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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Extension Activities
Is 81 a prime or composite number? How do you know?
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Extension Activities
What other strategies can you use to find out if a number is prime or composite?
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Extension Activities
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.