Download presentation

Presentation is loading. Please wait.

Published byThomas Reynolds Modified about 1 year ago

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
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.

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 14 14 = 2 X 7

28
What do you think a prime number is?

Similar presentations

© 2017 SlidePlayer.com Inc.

All rights reserved.

Ads by Google