Roman numerals gradually went out of general usage in the Middle Ages which was when the Hindu-Arabic numeral system was beginning to be used more often than the Roman numeral system.
There is no Roman Numeral for that number; Roman Numerals stop at 3,999.
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Because they were replaced by the Hindu-Arabic numeral system (the numbers we use today: 0 1 2 3 4 5 ..... ) which were a lot easier to do calculations with than the Roman numeral system. I believe that Roman numerals were no longer being used because: 1) There can be a lot of ways to write big numbers 2) It can be very long, imagine writing the amount of money you have in Roman numerals 3) You need to do calculations to know what number they are trying to say However, you need to know something: Roman numerals ARE STILL USED in clocks etc. but less widely already.
Roman numerals weren't even used outside Europe so I hardly consider them being used in "everyday life" of the average human. Roman numerals used a primitive and inconvenient system which was easily replaced by the Hindu-Arabic numerals that are now standard in the modern world.
In Europe, the Hindu-Arabic numerals gradually displaced the Roman numerals over a long period, from about 1000 AD to about 1500 AD. After that time, Roman numerals were no longer used in calculations. Roman numerals remained in use in "official" contexts, such as dates on the foundation stones of buildings, up to very recently. They are also still used in the names of monarchs (Queen Elizabeth II, Louis XIV of France), and Popes (Pope Pius X). Also the introductory pages of books are often labelled with Roman numerals. = =
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3 months
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By dividing it until you stop with a number that can be divided by two using the .0's