0580/13 Oct/Nov 2025, Question 20: Upper and Lower Bounds
Cambridge IGCSE Mathematics 0580 · Paper 13 (Core) · Non-calculator · 2 marks
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The question, in short
The height h of a door is 180 cm to the nearest centimetre. Complete the inequality showing the range of possible values of h.
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Solution · 2 marks
- 1The bounds are half a centimetre either side of 180
- 2Lower bound = 180 − 0.5 = 179.5, upper bound = 180 + 0.5 = 180.5
- 3179.5 ≤ h < 180.5
Answer179.5 ≤ h < 180.5
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