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

**Convert Rules:**

The following is the table to convert from Roman numerals to Arabic numbers. For example,

- 23 = 20 + 3 = XX + III = XXIII
- 58 = 50 + 8 = L + VIII = LVIII

Number | Thousands | Hundreds | Tens | Ones |
---|---|---|---|---|

1 | M | C | X | I |

2 | MM | CC | XX | II |

3 | MMM | CCC | XXX | III |

4 | CD | XL | IV | |

5 | D | L | V | |

6 | DC | LX | VI | |

7 | DCC | LXX | VII | |

8 | DCCC | LXXX | VIII | |

9 | CM | XC | IX |

The following is the conversion from **Roman numerals** **to Arabic numbers** for 1 to 100:

Roman | Arabic | Roman | Arabic |
---|---|---|---|

I | 1 | LI | 51 |

II | 2 | LII | 52 |

III | 3 | LIII | 53 |

IV | 4 | LIV | 54 |

V | 5 | LV | 55 |

VI | 6 | LVI | 56 |

VII | 7 | LVII | 57 |

VIII | 8 | LVIII | 58 |

IX | 9 | LIX | 59 |

X | 10 | LX | 60 |

XI | 11 | LXI | 61 |

XII | 12 | LXII | 62 |

XIII | 13 | LXIII | 63 |

XIV | 14 | LXIV | 64 |

XV | 15 | LXV | 65 |

XVI | 16 | LXVI | 66 |

XVII | 17 | LXVII | 67 |

XVIII | 18 | LXVIII | 68 |

XIX | 19 | LXIX | 69 |

XX | 20 | LXX | 70 |

XXI | 21 | LXXI | 71 |

XXII | 22 | LXXII | 72 |

XXIII | 23 | LXXIII | 73 |

XXIV | 24 | LXXIV | 74 |

XXV | 25 | LXXV | 75 |

XXVI | 26 | LXXVI | 76 |

XXVII | 27 | LXXVII | 77 |

XXVIII | 28 | LXXVIII | 78 |

XXIX | 29 | LXXIX | 79 |

XXX | 30 | LXXX | 80 |

XXXI | 31 | LXXXI | 81 |

XXXII | 32 | LXXXII | 82 |

XXXIII | 33 | LXXXIII | 83 |

XXXIV | 34 | LXXXIV | 84 |

XXXV | 35 | LXXXV | 85 |

XXXVI | 36 | LXXXVI | 86 |

XXXVII | 37 | LXXXVII | 87 |

XXXVIII | 38 | LXXXVIII | 88 |

XXXIX | 39 | LXXXIX | 89 |

XL | 40 | XC | 90 |

XLI | 41 | XCI | 91 |

XLII | 42 | XCII | 92 |

XLIII | 43 | XCIII | 93 |

XLIV | 44 | XCIV | 94 |

XLV | 45 | XCV | 95 |

XLVI | 46 | XCVI | 96 |

XLVII | 47 | XCVII | 97 |

XLVIII | 48 | XCVIII | 98 |

XLIX | 49 | XCIX | 99 |

L | 50 | C | 100 |

The following is the conversion from **Arabic numbers to Roman**

**numerals**for 1 to 100:

Arabic | Roman | Arabic | Roman |
---|---|---|---|

1 | I | 51 | LI |

2 | II | 52 | LII |

3 | III | 53 | LIII |

4 | IV | 54 | LIV |

5 | V | 55 | LV |

6 | VI | 56 | LVI |

7 | VII | 57 | LVII |

8 | VIII | 58 | LVIII |

9 | IX | 59 | LIX |

10 | X | 60 | LX |

11 | XI | 61 | LXI |

12 | XII | 62 | LXII |

13 | XIII | 63 | LXIII |

14 | XIV | 64 | LXIV |

15 | XV | 65 | LXV |

16 | XVI | 66 | LXVI |

17 | XVII | 67 | LXVII |

18 | XVIII | 68 | LXVIII |

19 | XIX | 69 | LXIX |

20 | XX | 70 | LXX |

21 | XXI | 71 | LXXI |

22 | XXII | 72 | LXXII |

23 | XXIII | 73 | LXXIII |

24 | XXIV | 74 | LXXIV |

25 | XXV | 75 | LXXV |

26 | XXVI | 76 | LXXVI |

27 | XXVII | 77 | LXXVII |

28 | XXVIII | 78 | LXXVIII |

29 | XXIX | 79 | LXXIX |

30 | XXX | 80 | LXXX |

31 | XXXI | 81 | LXXXI |

32 | XXXII | 82 | LXXXII |

33 | XXXIII | 83 | LXXXIII |

34 | XXXIV | 84 | LXXXIV |

35 | XXXV | 85 | LXXXV |

36 | XXXVI | 86 | LXXXVI |

37 | XXXVII | 87 | LXXXVII |

38 | XXXVIII | 88 | LXXXVIII |

39 | XXXIX | 89 | LXXXIX |

40 | XL | 90 | XC |

41 | XLI | 91 | XCI |

42 | XLII | 92 | XCII |

43 | XLIII | 93 | XCIII |

44 | XLIV | 94 | XCIV |

45 | XLV | 95 | XCV |

46 | XLVI | 96 | XCVI |

47 | XLVII | 97 | XCVII |

48 | XLVIII | 98 | XCVIII |

49 | XLIX | 99 | XCIX |

50 | L | 100 | C |

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