| Roman Numerals www.dexnet.f9.co.uk |
Roman Numbering System |
| Arabic | 1 | 5 | 10 | 50 | 100 | 500 | 1000 |
| Roman | I | V | X | L | C | D | M |
| EXAMPLES | |||||
|---|---|---|---|---|---|
| Arabic | Roman | Breakdown | |||
| 2000 | MM | M 1,000 |
M 1,000 |
||
| 1999 | MCMXCIX | M 1,000 |
CM 1,000-100 |
XC 100-10 |
IX 10-1 |
| 1966 | MCMLXVI | M 1,000 |
CM 1,000-100 |
LX 50+10 |
VI 5+1 |
| 1888 | MDCCCLXXXVIII | M 1,000 |
DCCC 500+100+100+100 |
LXXX 50+10+10+10 |
VIII 5+1+1+1 |
|
The subtractive rule.
The subtractive element must be within 2 digits of the major element. Therefore MDM equals M (1,000) + DM (-500+1,000) = 1,500 MCM equals M (1,000) + CM (-100+1,000) = 1,900 However MLM is NOT valid as the L is three digits below M. 1,990 would be MCMXC M(1,000) +CM(-100+1,000) +XC(-10+100) and 1999 would not be MIM but MCMXCIX as in the table above. |
| © MM (RD February 2000) |
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