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Simplifying Problems with Diagrams and Tables

A difficult-looking problem can become easier to reason about when its information is organised differently. Open Full Article...

Proving That an Answer Must Be True

What separates an answer that looks right from one that must be right? A correct result does not, by itself, show why it cannot be different. Open Full Article...

Finding Patterns and Testing Conjectures

If a pattern has worked every time it has been checked, must it always be true? Open Full Article...

Working Backwards from a Result

If you know where a calculation finished, can you reconstruct exactly where it started? Open Full Article...

Turning Word Problems into Mathematics

A paragraph about tickets can hide several different quantities and relationships. Open Full Article...