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
Coins of the pound sterling usually be said "one-and-six". "Quid" remains as popular slang for one or more pounds to this day in Britain in the form "a quid" and then "two quid", and so on. Similarly, in some parts of the country, "bob" continued to represent one-twentieth of a pound, that is five new pence, and "two bob" is 10p. The introduction of decimal currency caused a new casual usage to emerge, where any value in pence is spoken using the suffix "pee": e.g. "twenty-three pee" or, in the early years, "two-and-a-half pee" rather than the previous "tuppence-ha'penny". Amounts over a pound are normally