You may also like

problem icon


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

problem icon

Russian Cubes

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

problem icon

N000ughty Thoughts

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

Counting Binary Ops

Stage: 4 Challenge Level: Challenge Level:2 Challenge Level:2
The underlying structure of this problem is very similar to Walkabout. The teachers' notes to Walkabout suggest a possible approach which would work here too.