Currency conversion

I don't understand how to do a currency conversion, is there a little trick that I can do so I can quickly do a on the spot conversion.
If possible by rounding up, so my head doesn't explode

1.00 AUD = 9,917.02 IDR
Australian Dollar ↔ Indonesian Rupiah
1 AUD = 9,917.02 IDR 1 IDR = 0.000100837 AUD


Thanks

I may be misunderstanding your question, Dwight, but I'd try to picture a dollar bill, with a huge bag of rupiah next to it, to remember that one dollar is LOTS of rupiah. So when I convert to rupiah, I always have a bigger number, and when I convert the other way, I always have a smaller number.

Then a "trick" might be to add 4 zeros to a number in dollars to get the approximate rupiah value: So, $50 = about 500000 Rp. [500,000Rp]

$623.99 = about 6239900Rp. [6,239,900Rp.]


And to go the other way, take away 4 zeros [or numbers] so 75,000Rp = about $7. I wouldn't worry about rounding any of the numbers, since this is approximate anyway.

123,456,789Rp = about $12345. [$12,345.]

56,750,000Rp = about $5675. [$5,675.]

These are all very approximate, but will be enough for daily use, and I'd go straight to http://xe.com if I needed a more accurate result. I'm not sure if I'm explaining this very well? I hope it makes some sense?

Thats exactly what I want, now I just have to write it down (a lot ) to try and get it clear in my head.

Warm wishes to you Ada