A year with subtractions
- Input
- MCMXCIV
- Expected output
- 1994
M + CM + XC + IV = 1000 + 900 + 90 + 4.
Carregando ferramenta… / Loading tool…
how to convert roman numerals to numbers
In the Roman to number tab, paste the numeral and the tool shows the value, the breakdown into blocks and, if the numeral is invalid, the broken rule with the correct form.
M + CM + XC + IV = 1000 + 900 + 90 + 4.
XL (40) plus II (2).
Each letter appears once, from largest to smallest.
MM (2000) + XX (20) + VI (6).
I subtracts only from V and X. The literal reading gives 99, which is written XCIX.
Write the number with the largest pieces that fit, in the order M (1000), CM (900), D (500), CD (400), C (100), XC (90), L (50), XL (40), X (10), IX (9), V (5), IV (4) and I (1). For 1994: M (1000) plus CM (900) plus XC (90) plus IV (4), that is MCMXCIV. The tool shows these steps.
They are old additive forms (4 and 9). Strict mode rejects them and the tool suggests IV and IX; with Accept additive forms on, they are read normally.
The overline multiplies the letter by a thousand: V with a bar is 5000 and I and V with bars is 4000. The tool reads the overline and also the parentheses notation, such as (IV), up to 3,999,999.
Yes. mcmxciv is 1994. The Unicode characters Ⅰ to ⅿ, such as Ⅷ, are also accepted and normalized to Latin letters before reading.
1000 + 900 + 90 + 4 = 1994