What are the units of US money?

Answer 1

The basics of US money

1 cent coin also called a 'penny'
1 nickel coin = 5 cents
1 dime coin = 10 cents
1 quarter (quarter of a dollar) coin = 25 cents
1 half dollar = 50 cents
1 dollar coin or paper currency = $1.00 = 100 cents

The rest are all paper currency:
$2 bill
$5 bill
$10 bill
$20 bill
$50 bill
$100 bill
That's it for US money that is currently being minted/printed.

There are still some $500 and $1000 bills around, but are mostly in the hands of collectors. Larger bills are rare, and found in collections for the most part. All are still recognized as legal tender (with the exception of the lowly cent - you cannot force anyone to take pennies in payment, but everyone does in small amounts.)