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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… 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!

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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!

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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!

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

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Round down!

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

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32

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Round down!

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97

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Round up!

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5

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71

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Round down!

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Multiplication X 1 1 x 1 = 1 2 x 1 = 2 3 x 1 = 3 4 x 1 = 4 5 x 1 = 5 6 x 1 = 6 7 x 1 = 7 8 x 1 = 8 9 x 1 = 9 10 x 1 = 10 11 x 1 = 11 12 x 1 = 12 X 2 1.

Multiplication X 1 1 x 1 = 1 2 x 1 = 2 3 x 1 = 3 4 x 1 = 4 5 x 1 = 5 6 x 1 = 6 7 x 1 = 7 8 x 1 = 8 9 x 1 = 9 10 x 1 = 10 11 x 1 = 11 12 x 1 = 12 X 2 1.

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