Live Problems - Stage 4 & 5

Each time you visit the NRICH site there will be some activities which are 'live'. That means we are inviting you to send us your solutions and we will publish a selection of them, along with your name and school. If you'd like to read more about what we're looking for, read this short article.

This set of tasks will stop being live on Friday 12 October. 

Vanishing Pointlive

Age 14 to 18 Challenge Level:

How can visual patterns be used to prove sums of series?

Mixing More Paintslive

Age 14 to 16 Challenge Level:

Can you find an efficent way to mix paints in any ratio?

Squaring the Rectanglelive

Age 14 to 18 Challenge Level:

Can you find a way to turn a rectangle into a square?