Ring of Numbers 1 Jun 2013 | 04:00 am

Choose four of the numbers from 1 to 9 to put in the squares so that the differences between joined squares are odd.

Strange Bank Account (part 2) 1 May 2013 | 04:00 am

Investigate different ways of making £5 at Charlie's bank.

Strange Bank Account 1 Apr 2013 | 04:00 am

Imagine a very strange bank account where you are only allowed to do two things...

Complex Squares 1 Mar 2013 | 05:00 am

What happens when we square complex numbers? Can the square of a complex number be real?

A Brief Introduction to Complex Numbers 1 Feb 2013 | 05:00 am

In this problem, we define complex numbers and invite you to explore what happens when you add and multiply them.

A Brief Introduction to the Argand Diagram 1 Feb 2013 | 05:00 am

Complex numbers can be represented graphically using an Argand diagram. This problem explains more...

Picture This! 1 Nov 2012 | 04:00 am

Sorted 1 Oct 2012 | 04:00 am

How can you quickly sort a suit of cards in order from Ace to King?

Felix's Parachute Jump 1 Oct 2012 | 04:00 am

On October 14th 2012, Felix Baumgartner made a world record breaking parachute jump. Can you figure out the numbers behind his jump?

Upper Secondary Big Button 1 Sep 2012 | 04:00 am

Big Button page for upper secondary students