# LO: To be able to round numbers

LO: To be able to round numbers Mrs Vivien Criddle Westfield Middle School 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 Up or Down Does the number end in

1, 2, 3, 4 Round down Does the number end in

5, 6, 7, 8, 9 Round up Lets look at a number line

Where do these numbers go? 64 21 39

83 Lets take a closer look

21 Is 21 closer to 20 or 30? Does it end in

1, 2, 3 or 4? Round down! Another close look

39 Is 39 closer to 30 or 40?

Does it end in 5, 6, 7, 8 or 9? Round up!

Another close look 64

Is 64 closer to 60 or 70? Does it end in 1, 2, 3 or 4?

Round down! Another close look

83 Is 83 closer to 80 or 90? Does it end in

1, 2, 3 or 4? Round down! Your turn

Use your whiteboard Draw an arrow on it Show me Round up

Round down 32 Round down!

97 Round up!

5 Round up! 71

Round down!

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