The following rules apply to subtraction: Only powers of ten (I, X, C, M) can be subtracted.
Numbers in this system are represented by combinations of letters from the Latin alphabet.In 1986 the United States Mint started producing gold coins to appeal to precious metal bullion investors. This included specifying the date using Roman numerals.They decided to revive the classic design of Augusta Saint-Gaudens twenty dollar gold coins. Just as in the original series the use of Roman numerals in the date was short-lived. Mint will issue a special one-year Ultra-High Relief Saint-Gaudens gold double eagle (twenty-dollar gold piece) in 2009.By putting these letters together, the reader would obtain a number, usually indicating a particular year.By the 11th century, Hindu–Arabic numerals had been introduced into Europe from al-Andalus, by way of Arab traders and arithmetic treatises.This translation tool allows you to convert to and from roman numerals.