4024/12 Oct/Nov 2021, Question 7: 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 (8230 × 0.64) ÷ 18.7 by rounding each number to 1 significant figure.
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Solution · 2 marks
- 18230 ≈ 8000, 0.64 ≈ 0.6, 18.7 ≈ 20
- 2(8000 × 0.6)/20 = 4800/20 = 240
Answer240
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