Do I need an account to practise Estimation?

No. You can start practising Estimation straight away without an account. A free account keeps your results across sessions, so you can see your progress on this topic over time.

Estimation, rounding and accuracy

Estimation

41 self-marking GCSE and IGCSE practice questions on Estimation, written specifically for AQA, Pearson, OCR, Cambridge IGCSE Mathematics (0580), Cambridge IGCSE (9-1) Mathematics (0980) across Foundation and Higher and Core and Extended tier. Instant marking with full worked solutions on every question.

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Sample Estimation questions

A few of the 41 questions, from easier to harder. Choose your exam board and tier to practise them, with every answer marked.

Question 12 marksGrade 2
By rounding each value to one significant figure, estimate the cost of 3.9 kg of apples at 87p per kg.
Show the worked solution
3.9 kg rounds to 4 kg (1 s.f.). 87p rounds to 90p (1 s.f.). M1
Estimate = 4 × £0.90 = £3.60. A1
Question 22 marksGrade 4
Ruth buys 19 identical tickets for £280.25. Estimate the cost of one ticket. Show your working.
Show the worked solution
Round each value to make the division easy: £280.25 ≈ £280, and 19 ≈ 20. M1
Estimate: £280 ÷ 20 = £14. A1
Question 33 marks

What are the common mistakes in Estimation?

When a pupil makes one of these on Revision Workshop, the marking engine names the mistake and explains it, instead of just marking the answer wrong.

Uses the exact given values instead of rounding them first when asked to estimate
Calculated using the exact decimal values instead of first rounding each to 1 significant figure
Rounds to the nearest whole number instead of 1 significant figure
Rounded each number to the nearest whole number instead of to 1 significant figure (this loses all the information in a number smaller than 1, like 0.08)
Rounds only some of the values before estimating a calculation, rather than all of them
Rounded some of the numbers to 1 significant figure but not all of them before calculating

Quick answers about Estimation

How many Estimation practice questions are there?: There are 41 self-marking GCSE and IGCSE Maths questions on Estimation, written for AQA, Pearson, OCR, Cambridge IGCSE Mathematics (0580), Cambridge IGCSE (9-1) Mathematics (0980) across Foundation and Higher and Core and Extended tier. Each one is marked instantly and has a full worked solution.
Do I need an account to practise Estimation?: No. You can start practising Estimation straight away without an account. A free account keeps your results across sessions, so you can see your progress on this topic over time.