We've been looking at how Roman numbers work.
When it gets on to the big numbers, as B. said, our numbers are easier:
The Romans maybe found them hard to use too. They didn't have electricity, so they didn't have a calculator.
Instead, some of them used an abacus:
Strangely, it's very similar to the abacus used in Japan:
We watched the first few minutes of this to see how to count on the abacus:
Then we had a look at an online abacus: