There are precisely twenty nickels in one dollar. Each each nickel is worth 5 cents, and one dollar contains 100 cents. Given that 20 times 5 equals 100, there are 20 nickels every dollar.
The penny is the lowest denomination coin in the United States currency system, with a value of 1 cent. The nickel has the second-lowest value, at 1 cent. A nickel is mostly composed of copper, but also contains approximately 25 percent nickel. In 1866, the first official nickel was coined. In the late 18th century, however, the silver half dime had been in circulation. Since a dime is worth 10 cents, a nickel is essentially equivalent to a half dime.