Presentation is loading. Please wait.

Presentation is loading. Please wait.

Lesson Objective: To be able to round numbers

Similar presentations


Presentation on theme: "Lesson Objective: To be able to round numbers"— Presentation transcript:

1 Lesson Objective: To be able to round numbers

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 more usable forms. Rounding means we ignore some of the less significant digits.

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

4 Lets look at a number line…
Where do these numbers go? 64 21 39 83

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

8 Round up!

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

10 Round down!

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

12 Round down!

13 32

14 Round down! 30

15 97

16 Round up! 100

17 5

18 Round up! 10

19 71

20 Round down! 70

21 Round to the nearest thousand
512827

22 Round Up 513000


Download ppt "Lesson Objective: To be able to round numbers"

Similar presentations


Ads by Google