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
Nigerian pound Nigerian pound The Nigerian pound was the currency of Nigeria between 1907 and 1973. Until 1958, Nigeria used the British West African pound, after which it issued its own currency. The pound was subdivided into 20 shillings, each of 12 pence. The Nigerian pound (which was at parity with the British pound with easy convertibility) was replaced with the introduction in 1973 of the decimal "naira" at a rate of 1 pound = 2 naira. This made Nigeria the last country to abandon the £sd currency system. Coins were issued in 1959 in denominations of ½, 1, 3 and 6