problem A Biggy Age 14 to 16 Challenge level Find the smallest positive integer N such that N/2 is a perfect cube, N/3 is a perfect fifth power and N/5 is a perfect seventh power.
problem Em'power'ed Age 16 to 18 Challenge level Find the smallest numbers a, b, and c such that: a^2 = 2b^3 = 3c^5 What can you say about other solutions to this problem?
problem Some Cubes Age 16 to 18 Challenge level The sum of the cubes of two numbers is 7163. What are these numbers?
problem What's Left? Age 5 to 7 Challenge level Use this grid to shade the numbers in the way described. Which numbers do you have left? Do you know what they are called?
problem Round and round the circle Age 7 to 11 Challenge level What happens if you join every second point on this circle? How about every third point? Try with different steps and see if you can predict what will happen.
problem Prompt Cards Age 7 to 11 Challenge level These two group activities use mathematical reasoning - one is numerical, one geometric.
article An introduction to proof by contradiction An introduction to proof by contradiction, a powerful method of mathematical proof.
problem Swimming Pool Tiles Age 7 to 11 Challenge level This activity creates an opportunity to explore all kinds of number-related patterns.
problem Statement Snap Age 7 to 14 Challenge level You'll need to know your number properties to win a game of Statement Snap...