0580/11 Oct/Nov 2025, Question 9: Calculating a Percentage of a Quantity
Cambridge IGCSE Mathematics 0580 · Paper 11 (Core) · Non-calculator · 3 marks
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The question, in short
Shade three quarters of a 4 by 5 grid of 20 rectangles, then calculate 15% of 80.
Summarised in our own words. Use the official paper for the exact wording and the diagram.
Part (a) · 1 mark
Shade the correct number of the 20 small rectangles to represent 3/4 of the grid.
- 13/4 × 20 = 15, so shade 15 of the 20 rectangles
Answer15 rectangles shaded
Part (b) · 2 marks
Calculate 15% of 80, showing the value obtained.
- 115% of 80 = 15/100 × 80
- 2= 12
Answer12
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