0580/11 Oct/Nov 2025, Question 19: Estimation
Cambridge IGCSE Mathematics 0580 · Paper 11 (Core) · Non-calculator · 2 marks
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The question, in short
Round 5.3, 19.5 and 2.49 each to 1 significant figure, then use these rounded values to estimate the value of (5.3 × 19.5) ÷ 2.49.
Summarised in our own words. Use the official paper for the exact wording and any diagrams.
Solution · 2 marks
- 15.3 ≈ 5, 19.5 ≈ 20, 2.49 ≈ 2
- 2(5 × 20)/2 = 100/2 = 50
Answer50
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