Learning to talk currency

I am really working hard to nail down how to say the amounts in Indonesian Rupiah. B helped by giving me currency puzzles so I would either write the numerical amount or write out the words.

We are making good use of the whiteboard. We did the same thing for each other with times on a clock for several days. It helped more with the clock than the money. There seem to be so many words. It takes me 10 minutes just to say the larger amounts, but I'm trying to work on it and get faster.