# Past Features

### Factorise This!

##### Stage: 3 and 4 Challenge Level:

Explore quadratics and the power of factorisation

### Short Problem Showcase

##### Stage: 3 and 4 Challenge Level:

Test yourself with these short challenges

### Hidden Treasures

##### Stage: 3 and 4 Challenge Level:

Try these treasures to celebrate NRICH's birthday!

### Angles and Polygons

##### Stage: 3 and 4 Challenge Level:

Discover some angle relationships

### Maths for Champions

##### Stage: 3 and 4 Challenge Level:

Can you win the Maths Olympics?

### Exploring Our Number System

##### Stage: 3 and 4 Challenge Level:

Simple starting points in Number Theory

### Seeing Is Believing

##### Stage: 3 and 4 Challenge Level:

Some mathematical results can be proved beautifully with just a simple diagram...

### Number Patterns and Infinity

##### Stage: 3 and 4

Can you reach for the stars and make sense of infinity?

### Probability and Evidence

##### Stage: 3 and 4 Challenge Level:

These resources explore probability in medicine and the law.

### Should I Risk It?

##### Stage: 3 and 4 Challenge Level:

Explore how to use statistics and probability to make informed decisions

### Number Teasers

##### Stage: 3 and 4 Challenge Level:

Some tricky number teasers for you to puzzle over

### Playing with Polygons

##### Stage: 3 and 4 Challenge Level:

Be playful with polygons. What patterns can you find?

### Sequence Surprises

##### Stage: 3 and 4 Challenge Level:

Be surprised by some familiar sequences.

##### Stage: 3 and 4

How well do you really understand mean, median and mode?

### Surprised by Shapes

##### Stage: 3 and 4 Challenge Level:

Explore some shape problems and make some discoveries!

##### Stage: 3 and 4 Challenge Level:

Who would have thought that addition could be so intriguing?

### Freedom and Constraints

##### Stage: 3 and 4

There's more room to manoeuvre than you might think!

### Exploring Mathematics on Dotty Grids

##### Stage: 3 and 4

I wonder what maths we can do on dotty paper...

### How Numbers Behave

##### Stage: 3

By exploring these problems you'll gain a greater appreciation of the importance of place value.

### Positives and Negatives

##### Stage: 3 Challenge Level:

Learn all about positive and negative numbers!

### Seeing Mathematically

##### Stage: 3 Challenge Level:

Creating mental images is a powerful way to solve maths problems.

### All about Area and Perimeter

##### Stage: 3 Challenge Level:

Working on these problems will offer you insights into how areas and perimeters are related.

### Why Work Systematically?

##### Stage: 3 Challenge Level:

Systematic approaches will offer the most efficient routes to the solutions of these tasks.

### Reasoning with Data

##### Stage: 3 and 4 Challenge Level:

These resources are designed to get you thinking about data handling.

### Reasoning with Numbers

##### Stage: 3 and 4 Challenge Level:

These resources are designed to get you thinking about reasoning with numbers.

### Reasoning Geometrically

##### Stage: 3 and 4 Challenge Level:

These resources are designed to get you thinking about geometrical reasoning.

### Patterns in Number Sequences

##### Stage: 3 and 4 Challenge Level:

These resources are designed to get you thinking about number sequences and patterns.

### Playful Puzzling

##### Stage: 3 and 4 Challenge Level:

We hope you enjoy being mathematically playful with these puzzling problems.

### Area Intrigue

##### Stage: 3 and 4 Challenge Level:

These problems invite you to think about area in unusual ways.