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Roman numerals use letters I, V, X, L, C, D, M to represent values 1, 5, 10, 50, 100, 500, 1000. They appear on clock faces, film copyright dates, Super Bowls, and building cornerstones.
Công thức
I=1, V=5, X=10, L=50, C=100, D=500, M=1000; smaller before larger = subtract
- n
- Decimal Number (integer)
- R
- Roman Numeral (text)
Hướng dẫn từng bước
- 1I=1, V=5, X=10, L=50, C=100, D=500, M=1000
- 2Smaller value before larger = subtraction (IV=4, IX=9)
- 3Smaller value after larger = addition (VI=6, XI=11)
- 4No numeral appears more than 3 times consecutively
Ví dụ có lời giải
đầu vào
2024
Kết quả
MMXXIV (2000+20+4)
đầu vào
MCMXCIX
Kết quả
1999 (1000+900+90+9)
Câu hỏi thường gặp
Why do Roman numerals still exist?
Roman numerals appear in formal documents, clocks, book chapters, and movie copyright dates. They're recognized as elegant formal notation.
How do I know if a numeral like IV is subtraction?
When a smaller value appears before a larger value, it's subtraction: IV=4, IX=9. When larger is first, it's addition: VI=6, XI=11.
What's the largest Roman numeral?
Romans didn't have a zero or symbol for infinity. Vinculum (overline) multiplies by 1000: V̄ = 5000. Modern system stops at practical numbers.