Europe has Euro coins in denominations similar to the US Dollar. They have 1, 2, 5, 10, 20, and 50 Euro paper currency as well as .01, .10, .20, and .50 Euro cent coins
I think the US can do away with the penny since production costs far exceed the value of the coin. Just round everything up or down to the nearest 5 cents.
I never carry coins. If I get coins in change, I put them in jars when I get home. I have one jar specifically for pennies, and another for nickels, dimes and quarters which has an electronic lid that can distinguish between the different coins with counter and LCD display of the total amount in the jar. When the jars get nearly full, I take them in and my bank sorts and counts the coins for free and deposits the total in my bank account.
I do keep a few coins in my cars for the occasional parking meter.....but honestly can't remember the last time I had to use a parking meter? :banghead:
...Rich