IGCSE · Mathematics 0580 · Number

Estimation: IGCSE Mathematics questions with answers

Free Estimation questions for IGCSE Mathematics (0580), part of Number. Each question has the answer and the marking points an examiner would look for.

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Estimation practice questions

Question 1Structured · 2 marksA* challenge

By rounding each number to 1 significant figure, estimate the value of
25.9 × 6.660.2.
Show your working.

[2]
Show answers and mark scheme
PartAnswer and marking pointsMarks
1050
30 × 70.2 M1
1050 A1
2
Question 2Structured · 3 marks

x = 9088.186

(a)

Write x correct to 2 significant figures.

[1]
(b)

Write x correct to 1 decimal place.

[1]
(c)

Write x in standard form, correct to 3 significant figures.

[1]
Show answers and mark scheme
PartAnswer and marking pointsMarks
(a)9100
9100 B1
1
(b)9088.2
9088.2 B1
1
(c)9.09 × 103
9.09 × 103 B1
1
Question 3Structured · 2 marks

The volume of a cylinder is πr2h. Estimate the volume when r = 3.17 cm and h = 10.3 cm. Use π ≈ 3 and round the other values to 1 significant figure.

[2]
Show answers and mark scheme
PartAnswer and marking pointsMarks
270 cm³
3 × 32 × 10 M1
270 A1
2
Question 4Structured · 2 marksA* challenge

By rounding each number to 1 significant figure, estimate the value of
19.9 × 4.540.36.
Show your working.

[2]
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PartAnswer and marking pointsMarks
250
20 × 50.4 M1
250 A1
2
Question 5Structured · 3 marks

x = 8066.687

(a)

Write x correct to 2 significant figures.

[1]
(b)

Write x correct to 1 decimal place.

[1]
(c)

Write x in standard form, correct to 3 significant figures.

[1]
Show answers and mark scheme
PartAnswer and marking pointsMarks
(a)8100
8100 B1
1
(b)8066.7
8066.7 B1
1
(c)8.07 × 103
8.07 × 103 B1
1
Question 6Structured · 2 marks

By rounding each number to 1 significant figure, estimate the value of
21.2 × 5.140.487
Show your working.

[2]
Show answers and mark scheme
PartAnswer and marking pointsMarks
200
20 × 5 ÷ 0.5 seen M1
200 A1
2

More Number questions

Types of numberSetsPowers & rootsFractions, decimals & percentagesThe four operationsIndices IStandard formLimits of accuracyRatio & proportionRatesPercentagesTimeMoneyExponential growth & decaySurds

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Original Cambridge-style practice questions written for mentorriyaz.in. These are not Cambridge past paper questions, and this site is not affiliated with or endorsed by Cambridge University Press & Assessment. Updated 2026-11-04. Paper generator · mentorriyaz.in