You may also like

problem icon

Tangram Paradox

How can the same pieces of the tangram make this bowl before and after it was chipped? Use the interactivity to try and work out what is going on!

problem icon

Teddy Town

There are nine teddies in Teddy Town - three red, three blue and three yellow. There are also nine houses, three of each colour. Can you put them on the map of Teddy Town according to the rules?

problem icon

A Dotty Problem

Starting with the number 180, take away 9 again and again, joining up the dots as you go. Watch out - don't join all the dots!

Cogs Environment

Age 7 to 11 Challenge Level:
You can use the interactive environment to explore lots of different ideas including:
  • how cogs turn relative to each other

  • the relationship between the number of teeth on a set of different cogs and full turns

  • how cogs mesh together (how often does the same tooth go into the same gap?)


Full Screen Version
If you can see this message Flash may not be working in your browser
Please see http://nrich.maths.org/techhelp/#flash to enable it.