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

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Presentation on theme: "Is It A Prime Number, Yes or No? Jonathan Brinkerhoff."— Presentation transcript:

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 = 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 = 3 X 5

12 What do you think a prime number is?

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

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

15 8

16 9

17 14

18 17

19 21

20 10

21 19

22 You can correctly identify prime numbers.

23

24 2 is a prime number 2 = 1 X 2

25 9 is not a prime number 9 = 1 X 9 9 = 3 X 3

26 11 is a prime number 11 = 1 X 11

27 14 is not a prime number 14 = 1 X = 2 X 7

28 What do you think a prime number is?


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