4MA1/2FR Jun 2020, Question 19: Estimation
Pearson Edexcel International GCSE Mathematics A 4MA1 · Paper 2FR (Foundation) · Calculator · 2 marks
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The question, in short
Use rounded approximations to estimate (68.3 × 42.8) ÷ 0.021 without a calculator and judge whether Nav's calculator value 139201.9048 is reasonable, showing working.
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Solution · 2 marks
- 1Round each number: 68.3 ≈ 70, 42.8 ≈ 40, 0.021 ≈ 0.02
- 2Top: 70 × 40 = 2800
- 32800 ÷ 0.02 = 140 000, close to 139 201.9, so it is sensible: 140 000
Answer140 000
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