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Watch: Using estimation to check your answers

You can use estimation to get a rough idea of a calculation. Round the numbers to make it easier.

Then do the calculation. If it's really different to the estimation, a mistake has been made.

Try re-doing the calculation or use a different method to find the answer.

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NEW! Play Guardians: Defenders of Mathematica - the winter update. game

It's Mathematica as you鈥檝e never seen it before, with all-new festive backgrounds and costumes. Available for a limited time only. Use your maths skills to save the day before it's too late!

NEW! Play Guardians: Defenders of Mathematica - the winter update
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More on Processes in mathematics

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