0580/11 May/Jun 2021, Question 20: Estimation
Cambridge IGCSE Mathematics 0580 · Paper 11 (Core) · Calculator · 2 marks
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The question, in short
Estimate the value of (38.7 × 3.115)/(20.3 − 4.1²) by rounding each number to 1 significant figure, showing all working.
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Solution · 2 marks
- 138.7 ≈ 40, 3.115 ≈ 3, 20.3 ≈ 20, 4.1 ≈ 4
- 2(40 × 3)/(20 − 4²) = 120/(20 − 16) = 120/4
- 3= 30
Answer30
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