Your browser does not support javascript, some features of this page may not be available.
you need to have javascript enabled to play.
Go to the homepage of El Abuelo Educa
Volver a la página principal de El Abuelo Educa
learn and practice with funny games
Home
Roman Numbering

The Roman numbering used seven capital letters correspond to the following values:

LettersIVXLCDM
Values1510501005001000


To write all the numbers, you must meet the following rules:

1ª If the right of a Roman letter is written the same or lower, the value it adds to the previous one.

Examples:    VI = 6;    XXI = 21;    LXVII = 67

2ª The letter "I" placed before the "V" or "X", subtracts a unit to the next; the letter "X", preceding the "L" or "C", subtracts ten units to the next and the letter "C", preceding the "D" or "M", subtracts hundred units to the next.

Examples:    IV = 4;    IX = 9;    XL = 40;    XC = 90;    CD = 400;    CM = 900

3ª The same letter can not be repeated more than three times in any number.

Examples:    XIII = 13;    XIV = 14;    XXXIII = 33;    XXXIV = 34

4ª The letters "V", "L" and "D" can not be duplicated because there are other "X", "C" and "M" representing its value doubled.

Examples:    X (no VV) = 10 ;    C (no LL) = 100 ;    M (no DD) = 1.000

5ª If in the middle of two letters there is another of less value, it subtracted its value to the next.

Examples:    XIX = 19;    LIV = 54;    CXXIX = 129

6ª The value of Roman numerals is multiplied a thousand times as many horizontal lines are placed above them.



Interrogacion

The games in the menu will help you learn how to write Roman numerals.

More Mathematics