Rules for Roman Numerals

Understanding the basic rules of Roman numerals is crucial:

• Basic Symbols: Roman numerals use basic symbols to represent numbers: I (1), V (5), X (10), L (50), C (100), D (500), and M (1000).
• Repeated Symbols: If a Roman numeral has a symbol repeated, the values are added together. For example, II is 1 + 1 = 2.
• Subtractive Notation: When a smaller Roman numeral appears before a larger one, it is subtracted from the larger one. For example, IV represents 5 – 1 = 4.
• No More Than Three Repeats: A Roman numeral cannot have more than three consecutive identical symbols. Larger numbers are represented using subtractive notation.
• Order of Symbols: Roman numerals are read from left to right. Larger values should always come before smaller ones.

Roman numerals are an ancient numeral system with a rich history, known for their continued use in various contexts. In Roman numerals, 400 is represented as CD.