You may also like

Doodles

Draw a 'doodle' - a closed intersecting curve drawn without taking pencil from paper. What can you prove about the intersections?

Russian Cubes

I want some cubes painted with three blue faces and three red faces. How many different cubes can be painted like that?

N000ughty Thoughts

How many noughts are at the end of these giant numbers?

Walkabout

Age 14 to 16 Challenge Level:

The 'trick' is finding a systematic way to record all possibilities.