4024/12 Oct/Nov 2022, Question 9: Estimation
Cambridge O Level Mathematics 4024 · Paper 12 (Non-calculator) · Non-calculator · 2 marks
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The question, in short
Round 47.5, 36.1, 64.9 and 17.7 each to 1 significant figure, then use these to estimate the value of (47.5 + 36.1)/(64.9 ÷ 17.7).
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Solution · 2 marks
- 147.5 ≈ 50, 36.1 ≈ 40, 64.9 ≈ 60, 17.7 ≈ 20
- 2(50 + 40)/(60 ÷ 20) = 90/3
- 3= 30
Answer30
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