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LO: To be able to round numbers
Mrs Vivien Criddle
Westfield Middle School
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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
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Up or Down
• 1, 2, 3, 4
• 5, 6, 7, 8, 9
Does the number end in…
Does the number end in…
Round down
Round up
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Lets look at a number line…
Where do these numbers go?
21
39
64
83
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Let’s take a closer look…
21
Is 21 closer to 20 or 30?
Does it end in 1, 2, 3 or 4?
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Round down!
![Page 7: LO: To be able to round numbers Mrs Vivien Criddle Westfield Middle School](https://reader036.vdocument.in/reader036/viewer/2022062404/551ac1245503466b6a8b4ca2/html5/thumbnails/7.jpg)
Another close look…
39
Is 39 closer to 30 or 40?
Does it end in 5, 6, 7, 8 or 9?
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Round up!
![Page 9: LO: To be able to round numbers Mrs Vivien Criddle Westfield Middle School](https://reader036.vdocument.in/reader036/viewer/2022062404/551ac1245503466b6a8b4ca2/html5/thumbnails/9.jpg)
Another close look…
64
Is 64 closer to 60 or 70?
Does it end in 1, 2, 3 or 4?
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Round down!
![Page 11: LO: To be able to round numbers Mrs Vivien Criddle Westfield Middle School](https://reader036.vdocument.in/reader036/viewer/2022062404/551ac1245503466b6a8b4ca2/html5/thumbnails/11.jpg)
Another close look…
83
Is 83 closer to 80 or 90?
Does it end in 1, 2, 3 or 4?
![Page 12: LO: To be able to round numbers Mrs Vivien Criddle Westfield Middle School](https://reader036.vdocument.in/reader036/viewer/2022062404/551ac1245503466b6a8b4ca2/html5/thumbnails/12.jpg)
Round down!
![Page 13: LO: To be able to round numbers Mrs Vivien Criddle Westfield Middle School](https://reader036.vdocument.in/reader036/viewer/2022062404/551ac1245503466b6a8b4ca2/html5/thumbnails/13.jpg)
Your turn
• Use your whiteboard
• Draw an arrow on it
• Show me…
• Round up
• Round down
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32
![Page 15: LO: To be able to round numbers Mrs Vivien Criddle Westfield Middle School](https://reader036.vdocument.in/reader036/viewer/2022062404/551ac1245503466b6a8b4ca2/html5/thumbnails/15.jpg)
Round down!
![Page 16: LO: To be able to round numbers Mrs Vivien Criddle Westfield Middle School](https://reader036.vdocument.in/reader036/viewer/2022062404/551ac1245503466b6a8b4ca2/html5/thumbnails/16.jpg)
97
![Page 17: LO: To be able to round numbers Mrs Vivien Criddle Westfield Middle School](https://reader036.vdocument.in/reader036/viewer/2022062404/551ac1245503466b6a8b4ca2/html5/thumbnails/17.jpg)
Round up!
![Page 18: LO: To be able to round numbers Mrs Vivien Criddle Westfield Middle School](https://reader036.vdocument.in/reader036/viewer/2022062404/551ac1245503466b6a8b4ca2/html5/thumbnails/18.jpg)
5
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Round up!
![Page 20: LO: To be able to round numbers Mrs Vivien Criddle Westfield Middle School](https://reader036.vdocument.in/reader036/viewer/2022062404/551ac1245503466b6a8b4ca2/html5/thumbnails/20.jpg)
71
![Page 21: LO: To be able to round numbers Mrs Vivien Criddle Westfield Middle School](https://reader036.vdocument.in/reader036/viewer/2022062404/551ac1245503466b6a8b4ca2/html5/thumbnails/21.jpg)
Round down!
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