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Year 4 · Addition

Estimate by rounding to the nearest ten

Estimating gives a quick rough answer by rounding first.

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How to do it

  1. Round each number to the nearest ten or hundred.
  2. Add or subtract the rounded numbers.

Worked example

658 + 717
660 + 720
About 1380

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Watch out
Round before you add, not after.

Practise Estimate by rounding to the nearest ten properly

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