S2 topic guide

Ratio and Proportion

A ratio compares quantities, while proportion keeps that comparison equivalent when values change. It supports S2 maths practice based on Scotland’s Curriculum for Excellence.

Worked example

Red and blue counters are in the ratio 2:3. If there are 10 red counters, multiply both parts by 5, so there are 15 blue counters.

Common mistakes

Scale every part of a ratio by the same amount. Do not add the same number to each part when making an equivalent ratio.

Helpful hints appear after incorrect answers, then you can retry the question. This is practice support, not a formal assessment.

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