Problems
Stats Statements
Stage: 5 Challenge Level: 
Are these statistical statements sometimes, always or never true? Or it is impossible to say?
Circles Ad Infinitum
Stage: 5 Challenge Level:
A circle is inscribed in an equilateral triangle. Smaller circles touch it and the sides of the triangle, the process continuing indefinitely. What is the sum of the areas of all the circles?
Catalyse That!
Stage: 5 Challenge Level:
Can you work out how to produce the right amount of chemical in a temperature-dependent reaction?
Elsewhere...
Featured Solution
Sixty-seven Squared
Playing with numbers leads to a conjecture for the solution. Place value and summing a geometric series gives proof of the conjecture.
Articles & Games
Student Guide to Getting Started with Rich Tasks
This article gives advice on getting started with exploring rich mathematical tasks.
LCM Sudoku II
You are given the Lowest Common Multiples of sets of digits. Find the digits and then solve the Sudoku.
Slippery Snail
A game for 2 people. Take turns to move the counters 1, 2 or 3 spaces. The player to remove the last counter off the board wins.
