American money is widely used in the world and it works on the metric system. The American government prints money in the following denominations: $10, 000; $5,000; $1,000; $500; $100; $50; $10; $5; $2;$1.
Very few people see all these bills; twenties, tens fives and ones are the most commonly used. We can find a picture of George Washington on the $ 1 bill, Abraham Lincoln on the $ 5, Alexander Hamilton on the $ 10 and Andrew Jackson on the $ 20. There are also pictures on the back (the White House on the $20, the Treasury building on the $ 10, the Lincoln Memorial on the $5 and a big " ONE" and the American insignia on the $1). However, all paper currency is printed on the same size white paper with green ink, so you have to look carefully before handing someone money and when
receiving change. Your best bet is to forget the pictures and concentrate on the large numbers in all four corners on the front and back.
American coins are easy to remember. One American dollar is equal to 100 cents or pennies. A half-dollar is 50 cents. All but the penny and the nickel are made of silver. The penny is made of copper. The nickel is made of a metal called nickel
美国的货币在世界各地广泛使用而且遵循的是公制。美国政府印制的钱币有以下比值：一万元、五千元、一千元、五百元、一百元、五十元、二十元、十元、五元和一元。
