Current circulating denominations are:
$1 - a portrait of President George Washington
$2 - President Thomas Jefferson (this denomination isn't commonly used)
$5 - President Abraham Lincoln
$10 - 1st Treasury Secretary Alexander Hamilton
$20 - President Andrew Jackson
$50 - President Ulysses S. Grant
$100 - Statesman and scientist Benjamin Franklin
At one time the US also issued $500, $1000, $5000, and $10,000 bills for general circulation and printed special $100,000 bills for use inside the government. Printing was discontinued in 1945. In 1969, banks were ordered to stop distribution of high-denomination bills as a way of combatting organized crime.
The $100 bill.
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The present denominations of our currency in production are $1, $2, $5, $10, $20, $50 and $100.
As of today, the value of a reichsmark in today's currency exchange rates is difficult to determine as the currency is no longer in circulation. However, historical data suggests that 1 reichsmark could be equivalent to approximately 4.2 US dollars.
Coin collectors take currency out of circulation all the time. It's perfectly legal to do.
Bills with denominations higher than $100 are no longer in circulation. The $500 note had the portrait of William McKinley on the face. The US Federal Reserve began taking high denomination bills out of circulation in 1969 and fewer than 1000 of most denominations are held by only collectors today.
the currency is the dollar
US Treasuries. Bonds issued by the US Governemnt representing a 'promise to pay'.
Current paper money is issued in full-dollar denominations--$1, $2, $5, $10 and so on. However, during the Civil War a lot of coins were being hoarded so the U.S. did issue so-called "fractional currency" in a number of denominations as low as 3 cents. There's more information and pictures of fractional currency at the Related Link, below.
US Dollars and US Cents (100 cents makes a dollar)
There used to be, in denominations ranging from $10 up to $100,000. They were withdrawn from circulation in 1933.
Cameroon currency is the Central African Franc, XAF. It takes 465 Cameroon Francs to spend the equivalent of $1 of US currency. they use central African franc (CFA)