If 1 orange costs $1 then 5 oranges would cost $5
The basic math works out the same, and you can find today's exchange rates if you want to know the relative buying power.
There are different informal names used for some denominations likes nickels and quarters for 5 cent and 25 cent pieces. Many Americans can't say what a pence is.
This article on currency shows the common denominations of bills, though there are more exotic l value bills as well.
http://en.wikipedia.org/wiki/United_Stat...
they work exactly the same... 5 oranges at $1/organe is $5
Dollars work the same as pounds,