Currency Unit

Each currency typically has a main currency unit

(the U.S. dollar, for example, or the euro) and a fractional currency,often valued at 1⁄100 of the main currency: 100 cents = 1 dollar, 100 centimes = 1 franc, 100 pence = 1 pound, althoughunits of 1⁄10 or 1⁄1000 are also common. Some currencies do not haveany smaller units at all, such as the Icelandic króna.
auritania and Madagascar are the only remaining countries

that do not use the decimal system; instead, the auritanian ouguiyais divided into 5 khoums, while the Malagasy ariary is divided into 5 iraimbilanja. In these countries, words like dollar or pound "were simply names for given weights of gold."[2] Due to inflation khoums and iraimbilanja have in practice fallen into disuse. (See non-decimal currencies for other historic currencies with non-decimal divisions.)