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LO: To be able to round numbers Mrs Vivien Criddle Westfield Middle School.

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Presentation on theme: "LO: To be able to round numbers Mrs Vivien Criddle Westfield Middle School."— Presentation transcript:

1 LO: To be able to round numbers Mrs Vivien Criddle Westfield Middle School

2 What is rounding? Sometimes we want to add numbers in our head but the numbers are a bit tricky. We can estimate (take a good guess) the answer It is easier if we use numbers that are in 10s Rounding means we find the nearest 10

3 Up or Down 1, 2, 3, 4 5, 6, 7, 8, 9 Does the number end in… Round down Round up

4 Lets look at a number line… Where do these numbers go?

5 Let’s take a closer look… 21 Is 21 closer to 20 or 30? Does it end in 1, 2, 3 or 4?

6 Round down!

7 Another close look… 39 Is 39 closer to 30 or 40? Does it end in 5, 6, 7, 8 or 9?

8 Round up!

9 Another close look… 64 Is 64 closer to 60 or 70? Does it end in 1, 2, 3 or 4?

10 Round down!

11 Another close look… 83 Is 83 closer to 80 or 90? Does it end in 1, 2, 3 or 4?

12 Round down!

13 Your turn Use your whiteboard Draw an arrow on it Show me… Round up Round down

14 32

15 Round down!

16 97

17 Round up!

18 5

19

20 71

21 Round down!

22


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