1. A history of numbers and some modular arithmetic Nicole Rosenfeld

2. Different Number systems One Two Two and one Two two’s Much

4. Put up your hands What would people have done in… Rome Dubai Beijing Washington Tokyo

5. Ways of writing/recording

8. From Egypt to Cornwall As I was going to St. Ives, I met a man with seven wives, Each wife had seven sacks, Each sack had seven cats, Each cat had seven kits: Kits, cats, sacks, and wives, How many were there going to St. Ives?

9. Zero

10. Why dividing by zero breaks maths

11. Modular arithmetic… what is it…?

12. How we can use it (solving problems) How can we tell that 23468267 is not a square?

13. How we can use it (excitingly) Pisano

14. Finger counting challenge First I’ll show you Two challenges for the audience

15. Base 12

16. Some crazy systems Californian Yuki People and Charles XII of Sweden The Mayans and the French Negative bases

17. Is maths broken?