Proportion

Recognise and solve problems involving direct proportion (as one quantity increases, the other increases at a constant rate) and inverse proportion (as one increases, the other decreases), including graphical and algebraic representations

Usually learned at ages 12–14

Builds on: Proportional Reasoning Vocabulary, Proportion Graphs, Dividing Quantities by Ratio, Linear Function Graphs (helps), Ratio Notation and Relationships

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On the map from: Marble Skill Taxonomy (v1), © Generative Spark, Inc. (withmarble.com), text CC BY-SA 4.0, database ODbL 1.0: https://github.com/withmarbleapp/os-taxonomy