Search

Can you make matrices which will fix one lucky vector and crush another to zero?

Make a set of numbers that use all the digits from 1 to 9, once and once only. Add them up. The result is divisible by 9. Add each of the digits in the new number. What is their sum? Now try some other possibilities for yourself!

Can you match up the entries from this table of units?

A Short introduction to using Logo. This is the first in a twelve part series.

How well can you estimate 10 seconds? Investigate with our timing tool.

There are 78 prisoners in a square cell block of twelve cells. The clever prison warder arranged them so there were 25 along each wall of the prison block. How did he do it?

This short question asks if you can work out the most precarious way to balance four tiles.

Can you make the birds from the egg tangram?

These practical challenges are all about making a 'tray' and covering it with paper.