The Russian currency is known as the rouble, ruble, and roubles. The rouble is the official currency of the Russian Federation and has been in use since the late 18th century. The ruble is an older form of the rouble and was used in Russia until the early 20th century. The plural form of the rouble is roubles. The rouble is divided into 100 kopeks and is one of the world's most traded currencies.