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 occur only once in any number.

Examples:

  • 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, nor VIIIII;
  • Number 100 will be written as: C and not LL, nor LXXXXX, nor XXXXXXXXXX.

Roman numerals reading rules, summary:

I. The Roman numerals set of basic symbols

II. The rule of numerals repetition

III. Subtractive notation of the Roman numerals

IV. Additive notation of the Roman numerals


How to convert Arabic numbers to Roman numerals: breaking down into place value subgroups

Examples of converting Arabic numbers to Roman numerals


Roman numerals from 1 to 100

Roman numerals from 1 to 1000

Mathematical operations with Roman numerals:

I. Addition. Learn by example how to add Roman numerals the right way, like the Romans calculated, steps, explanations

II. Subtraction. Learn by example how to subtract Roman numerals the right way, like the Romans calculated, steps, explanations

III. Addition and subtraction. Learn by example how to add and subtract Roman numerals the right way, like the Romans calculated, steps, explanations