The second rule - Repetition of basic symbols in a Roman numeral

Numerals repetition - Repetition of certain symbols in a number:

  • These symbols: I (1), X (10), C (100), M (1,000), (X) (10,000), (C) (100,000) and (M) (1,000,000) may occur no more than three times in a row in any number.
  • These symbols: V (5), L (50), D (500), (V) (5,000), (L) (50,000), (D) (500,000) may appear only once in any number.


  • Number 4 is written as a numeral as: IV and not IIII (though the IIII form circulated as an additive form);
  • Number 5 is written as a numeral as: V and not IIIII;
  • Number 10 will be written as: X and not VV;
  • Number 100 will be written as: C and not XXXXXXXXXX, nor LXXXXX, nor LL etc.

Roman numerals reading rules, summary:

I. The first rule - Roman numerals set of basic symbols

II. The second rule - numerals repetition

III. The third rule - numerals subtraction

IV. The fourth rule - what numerals are allowed to be subtracted from larger value numerals

V. The fifth rule - numerals addition

VI. The sixth rule - Arabic numbers decomposing (breaking down) into place value subgroups, in expanded notation, before converting to Roman numerals

Examples of converting Arabic numbers into Roman numerals

Roman numerals from 1 to 100

Roman numerals from 1 to 1000