Decimal coinage is a system of currency where the basic unit is divided into ten equal parts, making calculations simpler. For example, in the United States, one dollar is divided into 100 cents. This system allows for easy conversion and addition, as all denominations are based on powers of ten. Many countries have adopted decimal coinage since the late 18th century, including France with its introduction of the franc in 1795. The shift to decimal systems has facilitated international trade and commerce, as it standardizes currency values and simplifies transactions across borders.