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 50:
| Roman | Arabic | Roman | Arabic |
|---|---|---|---|
| I | 1 | XXVI | 26 |
| II | 2 | XXVII | 27 |
| III | 3 | XXVIII | 28 |
| IV | 4 | XXIX | 29 |
| V | 5 | XXX | 30 |
| VI | 6 | XXXI | 31 |
| VII | 7 | XXXII | 32 |
| VIII | 8 | XXXIII | 33 |
| IX | 9 | XXXIV | 34 |
| X | 10 | XXXV | 35 |
| XI | 11 | XXXVI | 36 |
| XII | 12 | XXXVII | 37 |
| XIII | 13 | XXXVIII | 38 |
| XIV | 14 | XXXIX | 39 |
| XV | 15 | XL | 40 |
| XVI | 16 | XLI | 41 |
| XVII | 17 | XLII | 42 |
| XVIII | 18 | XLIII | 43 |
| XIX | 19 | XLIV | 44 |
| XX | 20 | XLV | 45 |
| XXI | 21 | XLVI | 46 |
| XXII | 22 | XLVII | 47 |
| XXIII | 23 | XLVIII | 48 |
| XXIV | 24 | XLIX | 49 |
| XXV | 25 | L | 50 |
The following is the conversion from Arabic numbers to Roman numerals for 1 to 50:
| Arabic | Roman | Arabic | Roman |
|---|---|---|---|
| 1 | I | 26 | XXVI |
| 2 | II | 27 | XXVII |
| 3 | III | 28 | XXVIII |
| 4 | IV | 29 | XXIX |
| 5 | V | 30 | XXX |
| 6 | VI | 31 | XXXI |
| 7 | VII | 32 | XXXII |
| 8 | VIII | 33 | XXXIII |
| 9 | IX | 34 | XXXIV |
| 10 | X | 35 | XXXV |
| 11 | XI | 36 | XXXVI |
| 12 | XII | 37 | XXXVII |
| 13 | XIII | 38 | XXXVIII |
| 14 | XIV | 39 | XXXIX |
| 15 | XV | 40 | XL |
| 16 | XVI | 41 | XLI |
| 17 | XVII | 42 | XLII |
| 18 | XVIII | 43 | XLIII |
| 19 | XIX | 44 | XLIV |
| 20 | XX | 45 | XLV |
| 21 | XXI | 46 | XLVI |
| 22 | XXII | 47 | XLVII |
| 23 | XXIII | 48 | XLVIII |
| 24 | XXIV | 49 | XLIX |
| 25 | XXV | 50 | L |
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