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Three children are going to buy some plants for their birthdays. They will plant them within circular paths. How could they do this?

Extra Challenges from Madras

A few extra challenges set by some young NRICH members.

Junior Frogs

Have a go at this well-known challenge. Can you swap the frogs and toads in as few slides and jumps as possible?

Inky Cube

Age 7 to 14
Challenge Level
What do you know about the faces of the cube?
How will you remember what you have done so far?
How will you try to find a route that works?
How do you know you have found all the possible routes?
How will you check that your route/s definitely work/s?
Don't forget that each face of the cube is different.