0580/22 Feb/Mar 2021, Question 4: Estimation
Cambridge IGCSE Mathematics 0580 · Paper 22 (Extended) · Calculator · 2 marks
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The question, in short
Estimate the value of (2.8 × 82.6)/(27.8 − 13.9) by rounding each number to 1 significant figure first.
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Solution · 2 marks
- 12.8 ≈ 3, 82.6 ≈ 80, 27.8 ≈ 30, 13.9 ≈ 10
- 2(3 × 80)/(30 − 10) = 240/20
- 3= 12
Answer12
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