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Is It A Prime Number, Yes or No?

Is It A Prime Number, Yes or No?. Jonathan Brinkerhoff. There are different kinds of numbers. You know about whole numbers, like 5, and fractions like ⅓. You know about odd and even numbers. Today, we’ll learn about another kind of number – prime numbers. I’m going to show you some numbers.

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Is It A Prime Number, Yes or No?

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  1. Is It A Prime Number, Yes or No? Jonathan Brinkerhoff

  2. There are different kinds of numbers. You know about whole numbers, like 5, and fractions like ⅓. You know about odd and even numbers. Today, we’ll learn about another kind of number – prime numbers.

  3. I’m going to show you some numbers. Some are prime and some are not. When you think you know what makes a number prime or not, raise your hand.

  4. 3 is a prime number 3 = 1 X 3

  5. 4 is not a prime number 4 = 1 X 4 4 = 2 X 2

  6. 5 is a prime number 5 = 1 X 5

  7. 6 is not a prime number 6 = 1 X 6 6 = 2 X 3

  8. 7 is a prime number 7 = 1 X 7

  9. 12 is not a prime number 12 = 1 X 12 12 = 2 X 6 12 = 3 X 4

  10. 13 is a prime number 13 = 1 X 13

  11. 15 is not a prime number 15 = 1 X 15 15 = 3 X 5

  12. What do you think a prime number is?

  13. Congratulations! You figured out that a prime number has only two factors, itself and 1.

  14. Let’s Practice! If it’s not a prime number If it’s a prime number

  15. 8

  16. 9

  17. 14

  18. 17

  19. 21

  20. 10

  21. 19

  22. Well done! You can correctly identify prime numbers.

  23. 2 is a prime number 2 = 1 X 2

  24. 9 is not a prime number 9 = 1 X 9 9 = 3 X 3

  25. 11 is a prime number 11 = 1 X 11

  26. 14 is not a prime number 14 = 1 X 14 14 = 2 X 7

  27. What do you think a prime number is?

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