4024/11 May/Jun 2020, Question 11: Estimation
Cambridge O Level Mathematics 4024 · Paper 11 (Non-calculator) · Non-calculator · 2 marks
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The question, in short
Estimate the value of 21.86 − 9.64 ÷ 2.47 by rounding each number to one significant figure.
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Solution · 2 marks
- 121.86 ≈ 20, 9.64 ≈ 10, 2.47 ≈ 2
- 220 − 10 ÷ 2 = 20 − 5
- 3= 15
Answer15
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