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Prerequisites

- R3a – Expressing one quantity as a fraction of another
- R4a – Using ratio notation, and reducing ratios to simplest form
- R5a – Dividing a quantity in a given ratio, and expressing the division of a quantity as a ratio
- R5b – Applying ratio to real contexts
- R6a – Expressing a multiplicative relationship between two quantities as a ratio or a fraction

# Understanding and using proportion as equality of ratios

In the real world

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