4024/12 May/Jun 2023, Question 11: Estimation
Cambridge O Level Mathematics 4024 · Paper 12 (Non-calculator) · Non-calculator · 2 marks
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The question, in short
Estimate the value of 18.2³ ÷ 0.395 by rounding each number to 1 significant figure.
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Solution · 2 marks
- 118.2 ≈ 20 and 0.395 ≈ 0.4
- 220³/0.4 = 8000/0.4
- 3= 20 000 (= 2 × 10⁴)
Answer20 000 or 2 × 10⁴
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