4024/12 May/Jun 2021, Question 4: Estimation
Cambridge O Level Mathematics 4024 · Paper 12 (Non-calculator) · Non-calculator · 3 marks
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The question, in short
Round 64 785 491 to the nearest million, then estimate (67.8 + 49.5) ÷ 0.187² by rounding each number to 1 significant figure.
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Part (a) · 1 mark
Give 64 785 491 rounded to the nearest million.
- 164 785 491 ≈ 65 000 000
Answer65 000 000
Part (b) · 2 marks
Round each value to 1 significant figure and use them to estimate (67.8 + 49.5) ÷ 0.187².
- 1≈ (70 + 50)/0.2²
- 2= 120/0.04
- 3= 3000
Answer3000
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