How Roman architects constructed monuments and trade routes using subtractive numerals.
The Seven Cardinal Symbols
The Roman numeral system is an additive-subtractive system built on seven primary Latin letter values.
Key Symbols: I = 1, V = 5, X = 10, L = 50, C = 100, D = 500, M = 1000
The Subtractive Principle Rules
To prevent writing four identical symbols in a row, a smaller numeral placed before a larger numeral indicates subtraction.
Subtractive Pairs: IV = 4, IX = 9, XL = 40, XC = 90, CD = 400, CM = 900
Why There is No Roman Zero
Romans used numerals solely to record accounting balances on stone monuments; actual arithmetic was conducted on bead counting boards (abaci).
Modern Era: Year 2026 = MMXXVI (2000 + 20 + 6)
Modern Applications Today
Roman numerals remain standard for book chapter prefaces, clock dials, copyright years in movie credits, and Super Bowl designations.
Example: Super Bowl LVIII = 58
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