You'll have to be careful at first not to confuse the denominations. To make matters more confusing, the treasury is in the process of introducing new types of bills for all these denominations. The new types show a large engraving of the famous American in an oval that is slightly off-center. On the old bills, the portrait is smaller and exactly centered. Both types will be used until the government has a chance to collect and destroy all the old bills.
American coins are even more confusing than currency notes.
Nowhere on an American coin will you find a number value. For some reason, the amounts are spelled out. Nor are the coins minted in size order. Fifty-cent pieces are rarely seen. You'll be able to access all 18 topic areas of this site.