0580/21 Oct/Nov 2025, Question 9: Calculating with Bounds
Cambridge IGCSE Mathematics 0580 · Paper 21 (Extended) · Non-calculator · 2 marks
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The question, in short
Using a speed rounded to the nearest 5 km/h and a time of 2 hours, calculate the smallest possible distance covered.
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Solution · 2 marks
- 1Lower bound of speed = 5 − 0.5 = 4.5 km/h
- 2Lower bound of distance = 4.5 × 2 = 9 km
Answer9
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