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Prime Numbers Some Simple Tips and Reminders Free powerpoints at

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Presentation on theme: "Prime Numbers Some Simple Tips and Reminders Free powerpoints at"— Presentation transcript:

1 Prime Numbers Some Simple Tips and Reminders Free powerpoints at

2 Definitions Even Numbers – Any number that can be divided by 2 Odd Numbers – Any number that cannot be divided by 2 Composite Number – An integer that can be divided by at least one other number (a factor) other than itself

3 Definitions Prime Number – An integer whose only factors are 1 and itself. Factor – a number that can divide another number without a remainder. Prime Factors – an expression of numbers that divides another integer without a remainder where all the factors are prime.

4 What numbers are prime? Lets look at a number grid from 1 to 100 and see how they were discovered.

5 Heres How You Do It Take out the number 1 because it is a special number

6 Heres How You Do It Take out the number 1 because it is a special number

7 Heres How You Do It Take out numbers that have a composite factor of 2

8 Heres How You Do It Take out numbers that have a composite factor of 2

9 Heres How You Do It Take out numbers that have a composite factor of 3

10 Heres How You Do It Take out numbers that have a composite factor of 3

11 Heres How You Do It Take out numbers that have a composite factor of 5

12 Heres How You Do It Take out numbers that have a composite factor of 5

13 Heres How You Do It Take out numbers that have a composite factor of 7

14 The PRIME Numbers! Take out numbers that have a composite factor of 7

15 How Do We Know They Are Prime? Composite numbers can be placed into varying types of rectangles Prime numbers cannot Lets look at that…

16 Composite Numbers

17 Prime Numbers

18 Thats It! A prime number cannot be divided by anything other than 1 and itself.


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