Different from Arabic numbers , there are 7 Roman numerals: I, V, X, L, C, D and M, where V is equal to 5 and M is equal to 1000.
| Roman | Arabic |
|---|---|
| I | 1 |
| V | 5 |
| X | 10 |
| L | 50 |
| C | 100 |
| D | 500 |
| M | 1000 |
| Arabic | Roman |
|---|---|
| 1 | I |
| 5 | V |
| 10 | X |
| 50 | L |
| 100 | C |
| 500 | D |
| 1000 | M |
The basic rule is when the larger number is in front, then add, when the smaller number is in front, then minus. For example:
- VI: where V is 5 and I is 1, V is larger and in front, so add the 2 numbers together 5+1 = 6
- IL: where L is 50 and I is 1, I is smaller and in front, so minus the 2 numbers together 50-1 = 49
- where the letters are the same, add together: III = 1 + 1 + 1 = 3
The following is the conversion from Roman numerals to Arabic numbers for 1 to 25:
| Roman | Arabic | Roman | Arabic |
|---|---|---|---|
| I | 1 | XIV | 14 |
| II | 2 | XV | 15 |
| III | 3 | XVI | 16 |
| IV | 4 | XVII | 17 |
| V | 5 | XVIII | 18 |
| VI | 6 | XIX | 19 |
| VII | 7 | XX | 20 |
| VIII | 8 | XXI | 21 |
| IX | 9 | XXII | 22 |
| X | 10 | XXIII | 23 |
| XI | 11 | XXIV | 24 |
| XII | 12 | XXV | 25 |
| XIII | 13 |
The following is the conversion from Arabic numbers to Roman numerals for 1 to 25:
| Arabic | Roman | Arabic | Roman |
|---|---|---|---|
| 1 | I | 14 | XIV |
| 2 | II | 15 | XV |
| 3 | III | 16 | XVI |
| 4 | IV | 17 | XVII |
| 5 | V | 18 | XVIII |
| 6 | VI | 19 | XIX |
| 7 | VII | 20 | XX |
| 8 | VIII | 21 | XXI |
| 9 | IX | 22 | XXII |
| 10 | X | 23 | XXIII |
| 11 | XI | 24 | XXIV |
| 12 | XII | 25 | XXV |
| 13 | XIII |
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