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Today, the only currencies which are not decimal are those that have no sub-units at all, plus the MauritanianThe Islamic Republic of Mauritania is a country in northwest Africa. Its coast faces the Atlantic Ocean, between Western Sahara on the north and Senegal on the south. It should not be confused with the ancient country of Mauretania. Mauritania and Madagas ouguiyaMRO is also the acronym for the Mars Reconnaissance Orbiter The Mauritanian ouguiya ( ISO 4217: MRO) is the currency of Mauritania. The only circulating currency whose division units are not based on a power of ten, each ouguiya is comprised of five khoum, 1 ouguiya = 5 khoum, and the Malagasy franc of MadagascarSee also Madagascar (movie) Madagascar is an island nation in the Indian Ocean, off the eastern coast of Africa. Madagascar is the 4th largest island in the world. It is the home of five percent of the world's plant and animal species, 80 per cent of them: 1 ariary = 5 Malagasy francs. The latter currency is doubly unusual: note that the "default" unit is actually the smaller unit.
Historically, non-decimal currencies were much more common, such as the British pound sterling before decimalisation in 1971.
Currencies