Roman numbers are made up from seven letters (I, V, X, L, C, M and D). A small numeral in front of a larger one is subtracted from it, so 90 is written as X (10) and subtracted from C (100) – XC. A small number after a larger one is usually added to it- for example, XI (11).
Roman numerals are still in use today, you can find them in the introduction pages of books (I, II, III, IV, etc), on traditional clock and watch faces, in film and TV credits (2007 will appear as MMVII), in serial film titles (Such as Star Wars: Episode III-Revenge of the sith). They are also used in the names of sporting events – the Beijing 2008 Olympics will be XXIX (29th) Games and the 2007 American Football Super Bowl will be the XLI (41st) final.
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