There are 7 basic symbols to write any roman numeral.

Roman numeral | I | V | X | L | C | D | M |

Hindu-Arabic | 1 | 5 | 10 | 50 | 100 | 500 | 1000 |

**Rules**

1.Repetition of a Roman numeral means addition.

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2. A smaller numeral written to the right of a larger numeral is always added to the larger numeral.

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3. A smaller numeral written to the left of a larger numeral is always subtracted from the larger numeral.

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4. When a smaller number is placed between two larger numerals, it is always subtracted from the larger number immediately following it.

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