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### Number and algebra

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### Working mathematically

### For younger learners

### Advanced mathematics

# Introductions to ...

### An Introduction to Magic Squares

### Divisibility Tests

### An Introduction to Tree Diagrams

### An Introduction to Modular Arithmetic

### An Introduction to Proof by Contradiction

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Age 7 to 16

Find out about Magic Squares in this article written for students. Why are they magic?!

Age 11 to 16

This article explains various divisibility rules and why they work. An article to read with pencil and paper handy.

Age 11 to 16

This article explains how tree diagrams are constructed and helps you to understand how they can be used to calculate probabilities.

Age 14 to 18

An introduction to the notation and uses of modular arithmetic

Age 14 to 18

An introduction to proof by contradiction, a powerful method of mathematical proof.