### Sometimes We Lose Things

Well now, what would happen if we lost all the nines in our number system? Have a go at writing the numbers out in this way and have a look at the multiplications table.

### Nim-like Games

A collection of games on the NIM theme

### A Story about Absolutely Nothing

This article for the young and old talks about the origins of our number system and the important role zero has to play in it.

# It Must Be 2000

### Why do this problem?

This activity is a good source of ideas for number investigations. It was originally set in the year $2000$ so was particularly appropriate then but of course you could change it to suit the year you are in now.

### Key questions

What could you do with this number?
What does it look like to have $2000$ objects, cubes, counters, etc.?