Audio & Video
Beat the Calculator
Kjartan Poskitt proves what looks complicated can be simple.
- Beat the Calculator
- 1089
- Perfect pentagon
- Fabulous flexagon
- Making Cubes
- Prime number pizza
- Numerical masterclass
- Q&A with Kjartan Poskitt
- No Breathing in Class
- Questions from schools
- Have a go!
- UK schools vs American schools
- Balloons!
- The origins of 'Lads'
- Inspiration
- Did anyone encourage Ross MacKenzie to write books?
- Tom and Ross on starting to write and draw
- Questions from Schools

















