Well there you go. But that's just convenience. Buy me another and I'll tell you what money is secretly, officially worth. Well, dimes are actually worth a dime. Nickels are only worth four cents, because a lot of the time you have to use one of your quarters to make it come out right.
Pennies are worth nothing.
Nobody in the department will admit it publicly, of course, but it's common knowledge that pennies have no value unless you get them squashed into souvenirs at an amusement park, in which case they're worth about a penny. Dollars are worth a dollar five, which makes them less valuable than four quarters. All other bills are worth face value except those weird new hundred dollar bills, which are worth ninety-nine dollars because they don't seem like real money. Fifty-cent pieces are worth forty cents, except if you're a little kid and you got it for your birthday from an exceptionally cheap aunt, in which case it's worth the two quarters you're going to change it into first chance you get. Finally, the new dollar coin we're working on is expected to be worth about eighty cents, which is forty cents more than Susan B. Anthony dollars ended up being.