4MA1/2H Jun 2025, Question 22: Calculating with Bounds
Pearson Edexcel International GCSE Mathematics A 4MA1 · Paper 2H (Higher) · Calculator · 4 marks
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The question, in short
Using bounds for AB = 11.5 cm, BC = 9.2 cm and a square side 4.1 cm, find the shaded area X to a suitable degree of accuracy, showing working.
Summarised in our own words. Use the official paper for the exact wording and any diagrams.
Solution · 4 marks
- 1Bounds: AB 11.25 to 11.75, BC 9.15 to 9.25, side 4.05 to 4.15
- 2Upper bound X = 11.75 × 9.25 − 4.05² = 92.285
- 3Lower bound X = 11.25 × 9.15 − 4.15² = 85.715
- 4Both bounds round to 90 (1 s.f.)
- 5X = 90
Answer90
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