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
Japanese government-issued currency in the Dutch East Indies that, as of 11 March 1942, the only valid currency in the region were military banknotes and existing colonial gulden. Soon, however, they had begun replacing the pre-war currency at par. They soon required that all extant Dutch currency be exchanged for the occupation issue. This policy, however, was not implemented very strictly, and pre-war currency was widely hoarded, even in the internment camps. In March 1943, the Japanese occupation government ceased issuing military notes; at the time, military currency to the value of 353 million gulden was in circulation. Printing operations were moved to Kolff in Batavia (now Jakarta),