What does XXVIII mean in Roman numerals

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  • I = 1 (one); V = 5 (five);

  • X = 10 (ten); L = 50 (fifty);

  • C = 100 (one hundred);

  • D = 500 (five hundred);

  • M = 1,000 (thousand);

    • To write the calendar date in the future:
    • (*) V = 5,000 or | V | = 5,000 (five thousand); see below why we prefer: (V) = 5,000.

    • (*) X = 10,000 or | X | = 10,000 (ten thousand); see below why we prefer: (X) = 10,000.

Note 1: (*) This number was written either with an overline (one bar above the number) or between two vertical lines (two vertical bars).

Note 2: (*) We prefer to put these larger digits in brackets "()" instead, as they are more accessible to computer users and, on the other hand, it avoids confusion between the vertical line "|" and the Roman numeral "I" (one).

  • So, (V) = 5,000 and (X) = 10,000.

Note 3: (*) In the beginning the Romans used numbers no greater than 3,999, as this was no representation for the numbers:

  • 5,000 = (V), 10,000 = (X), 50,000 = (L), 100,000 = (C), 500,000 = (D), 1,000,000 = (M) had.

These were added later using various notations, not necessarily the ones mentioned above. Hence, at the beginning, the maximum number that could be written with Roman numerals was: