Convert standard numbers into Roman numerals and vice-versa.
There are seven symbols: I = 1, V = 5, X = 10, L = 50, C = 100, D = 500 and M = 1000. Values are added from largest to smallest, so MMXXVI is 1000 + 1000 + 10 + 10 + 5 + 1 = 2026. To avoid four of the same symbol in a row, a smaller symbol placed before a larger one is subtracted: IV is 4, IX is 9, XL is 40, XC is 90, CD is 400 and CM is 900. So 1994 is MCMXCIV.
Only I, X and C are used for subtraction, and only before the next two larger symbols. That's why 99 is XCIX, not IC.
Standard Roman numerals can't write 4000 without repeating M four times. The Romans handled bigger numbers with a bar over a symbol to multiply it by 1000, which isn't part of the standard form used today. The converter also rejects non-standard forms like IIII or VX, so it tells you if a numeral you've found isn't written the usual way.
MMXXVI: two thousands (MM), two tens (XX), a five (V) and a one (I).
It doesn't follow the standard rules, for example IIII instead of IV, or IC instead of XCIX. Clocks often show IIII for 4, which is a traditional exception.
No. The Romans had no numeral for zero, so the range is 1 to 3999.
Yes. mmxxvi converts the same as MMXXVI.
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