0580/13 Oct/Nov 2021, Question 20: Estimation
Cambridge IGCSE Mathematics 0580 · Paper 13 (Core) · Calculator · 2 marks
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The question, in short
Estimate the value of (4.3 × 30.7)/(6.6 − 1.8) by rounding each number to 1 significant figure.
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Solution · 2 marks
- 14.3 ≈ 4, 30.7 ≈ 30, 6.6 ≈ 7, 1.8 ≈ 2
- 2(4 × 30)/(7 − 2) = 120/5
- 3= 24
Answer24
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