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Prime Numbers

Explore the definitions of prime, composite, even, and odd numbers, with tips on identifying prime numbers up to 100. Learn how to distinguish prime numbers from composite numbers easily. Visit www.worldofteaching.com for more resources.

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Prime Numbers

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  1. Prime Numbers Some Simple Tips and Reminders Powerpoint hosted on www.worldofteaching.com Please visit for 100’s more free powerpoints

  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? • Let’s look at a number grid from 1 to 100 and see how they were discovered.

  5. Here’s How You Do It Take out the number 1 because it is a special number

  6. Here’s How You Do It Take out the number 1 because it is a special number

  7. Here’s How You Do It Take out numbers that have a composite factor of 2

  8. Here’s How You Do It Take out numbers that have a composite factor of 2

  9. Here’s How You Do It Take out numbers that have a composite factor of 3

  10. Here’s How You Do It Take out numbers that have a composite factor of 3

  11. Here’s How You Do It Take out numbers that have a composite factor of 5

  12. Here’s How You Do It Take out numbers that have a composite factor of 5

  13. Here’s 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 • Let’s look at that…

  16. 15 24 Composite Numbers 6

  17. 17 29 7 Prime Numbers

  18. That’s It! • A prime number cannot be divided by anything other than 1 and itself.

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