It is always really interesting when traveling to use different currencies. I usually go through a period where I do conversions in my head to figure out if something is a "good deal," based on the exchange rate. I'm still doing a bit of that, particularly as I'm trying to balance existing funds, vs getting more CLP out of a cash machine, so that I don't end up with a lot of left-over pesos to bring home or exchange for US dollars.
The other part of learning a new monetary system is, of course just figuring out denominations of bills and coins, and handing over correct change. When in doubt, I just stick out a big bill-this doesn't happen all that often anymore, because I know prices in places like the feria, and do the math in my head.
Chile has very colorful money-a US dollar looks so plain next to it:
Coins come in 500, 100, 50, 10, 5 and 1 peso denominations. At the current exchange rate, 500 is roughly about a dollar. So a 100 peso coin is about 20 cents, 50 pesos would be about 10 cents...you can see how the 10, 5 and 1 peso coins are of limited value!
Steve and I hoarded 500 and the new 100 peso coins for use in our building's washing machines. I always groaned silently whenever I got old 100 coins in change on my daily colectivo rides, since the don't fit in the machines. But for now, I think I have enough to last me for the duration of my stay here.