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
Halfpenny (British pre-decimal coin) of the Golden Hind appeared. Like all British coinage, it bore the portrait of the monarch on the obverse. "Halfpenny" was colloquially written "ha’penny", and "d" was spoken as "a penny ha’penny" or "three ha'pence" . Before Decimal Day in 1971 there were 240 pence in one pound sterling. Twelve pence made a shilling, and twenty shillings made a pound. Values less than a pound were usually written in terms of shillings and pence, e.g. 42 pence would be three shillings and six pence (3/6), pronounced "three and six", whereas 3 shillings even would be "3s" or, on a sign