Non-decimal currency Non-decimal currency A non-decimal currency is a currency that has sub-units that are a non-decimal fraction of the main unit, i.e. the number of sub-units in a main unit is not a power of 10. Today only two countries in the world use non-decimal currencies. Both of these countries are in Africa. These are Mauritania (1 ouguiya = 5 khoums) and Madagascar (1 ariary = 5 iraimbilanja). However these are only theoretically non-decimal, as in both cases the value of the main unit is so low that the sub-unit is too small to be of any practical use and coins
Decimal Day Ireland operated within the Sterling Area, effectively a single monetary area. The Irish pound had come into existence as a separate currency in 1927 with distinct coins and notes, but the terms of the Irish Currency Act obliged the Irish currency commissioners to redeem Irish pounds on a fixed 1:1 basis, and so day-to-day banking operations continued exactly as they had been before the creation of the Irish pound (). This state of affairs continued until 1979 when Irish obligations to the European Monetary System forced them to break the historic link with Sterling. In Ireland, all pre-decimal coins, except