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Weighty Problem
problem

Weighty Problem

11 to 14
The diagram shows a very heavy kitchen cabinet. It cannot be lifted but it can be pivoted around a corner. The task is to move it, without sliding, in a series of turns about the corners so that it is facing the other way round.
Colouring curves game
game

Colouring Curves Game

7 to 14

In this game, try not to colour two adjacent regions the same colour. Can you work out a strategy?

\pH temperature
problem

pH Temperature

16 to 18

At what temperature is the pH of water exactly 7?

The Square Hole
problem

The Square Hole

14 to 16
If the yellow equilateral triangle is taken as the unit for area, what size is the hole ?
Roll over the dice
problem

Roll Over the Dice

7 to 11

Watch this video to see how to roll the dice. Now it's your turn! What do you notice about the dice numbers you have recorded?

Countdown fractions
problem
Favourite

Countdown Fractions

11 to 16

Here is a chance to play a fractions version of the classic Countdown Game.

Leonardo's Problem
problem
Favourite

Leonardo's Problem

14 to 18

A, B & C own a half, a third and a sixth of a coin collection. Each grab some coins, return some, then share equally what they had put back, finishing with their own share. How rich are they?

Discrete Trends
problem
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Discrete Trends

16 to 18

Find the maximum value of n to the power 1/n and prove that it is a maximum.

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