Ratio, rates and percentages

About this lab: Ratio, rates and percentages

Interactive simulation for Cambridge IGCSE Mathematics 0580 topics 1.11 to 1.13 and 1.15 to 1.17: simplify ratios and share amounts with bar models, scale recipes and use map scales, find average speed, best value and currency conversions, calculate percentages, percentage change and reverse percentages on a double number line, compare simple and compound interest, model depreciation and population growth, and work with 12 and 24 hour clocks, durations and time zones.

IGCSE Mathematics 0580, topics 1.11-1.13 and 1.15-1.17. Ratio with bar models, speed, best value and exchange rates, percentages on a double number line, interest, growth and decay, and time.

Ratio, rates and percentages is a free, browser-based simulation for Cambridge IGCSE Mathematics 0580 (topic 1 Number, sections 1.11 Ratio and proportion, 1.12 Rates, 1.13 Percentages and more). The course is assessed in Paper 1 (Core non-calculator), Paper 2 (Extended non-calculator), Paper 3 (Core calculator), Paper 4 (Extended calculator). Syllabus for examination in 2025-2027. There are 5 tabs, each a self-contained experiment with its own controls and live readings, and nothing to install: it runs on a laptop, tablet or classroom projector.

Syllabus coverage

• 1.11 Ratio and proportion. Lessons: Ratio and proportion.
• 1.12 Rates. Lessons: Rates, average speed and best value.
• 1.13 Percentages. Lessons: Percentages: change, reverse percentages, Simple and compound interest.
• 1.14 Using a calculator. Lessons: Using a calculator efficiently.
• 1.15 Time. Lessons: Time: 12- and 24-hour clock, time calculations.
• 1.16 Money. Lessons: Money and currency conversion.
• 1.17 Exponential growth and decay (Extended). Lessons: Exponential growth and decay.

Full syllabus map: IGCSE Mathematics 0580 topic 1.

How to use this simulation

1. 1. Ratio.
2. 2. Rates.
3. 3. Percentages.
4. 4. Interest, growth, decay.
5. 5. Time.
6. The buttons at the end of the tab strip give the scene the whole window (Full screen, Hide controls) and, on a dark stage, a projector-friendly palette (Light scene). Many scenes also have drag handles: drag them to change the set-up directly.

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