Money: US versus British Pounds

Russell wanted to know if the money is different. We looked at some foreign currency in class to see what some of it looks like, but now I am using their money all the time instead of US money. I went to a bank in London to trade my US money for British money (Pounds) and they would not do that for me. I had to go to the post office to trade it. For every British pound, I had to give them $1.66 US. It's confusing but I'm getting used to it. My lunch today was 7 pounds so that means it cost me about $11.50. I have to think hard when someone tells me the price of something because their money is different.