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Multiples Sudoku
problem

Multiples Sudoku

11 to 14

Each clue in this Sudoku is the product of the two numbers in adjacent cells.

Markov Matrices
problem

Markov Matrices

14 to 18

Use matrices to find out how much cake I eat.

Outside the Box
article

Outside the Box

7 to 14
This article explores the links between maths, art and history, and suggests investigations that are enjoyable as well as challenging.
Quaternions and Rotations
problem

Quaternions and Rotations

16 to 18
Find out how the quaternion function G(v) = qvq^-1 gives a simple algebraic method for working with rotations in 3-space.
Choosing rich tasks for secondary classes
article

Choosing Rich Tasks for Secondary Classes

11 to 16

In this article, read about the thinking behind the September 2010 secondary problems and why we hope they will be an excellent selection for a new academic year.

Light weights
problem

Light Weights

16 to 18

See how the weight of weights varies across the globe.

problem
Favourite

How Would You Score It?

11 to 14

Invent a scoring system for a 'guess the weight' competition.

problem
Favourite

Who's the Winner?

14 to 16

When two closely matched teams play each other, what is the most likely result?

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