Indeed, we have all seen these symbols at some point: Roman numerals have a fascinating history, and their use continues today.
For example, the number 91 in roman numerals is XCI, and the number 99 in roman numerals is XCIX. But how does this roman number system work?
In this article, you will learn the origin of this numbering system and the rules for writing roman numerals. Finally, we will show the list of numbers from 1 to 100 in Roman notation as an example.
What are Roman numerals?
Roman numerals are a system for writing numbers invented during the Roman Empire to represent numerical values using capital letters of the Latin alphabet. They have been used for centuries throughout the Western world until the late middle ages.
This numbering system is based on seven letters of the alphabet: I, V, X, L, C, D, and M. These letters can be used alone or in combination with each other to represent whole numbers.
The main drawback of this system is the difficulty of converting large numbers into this notation.
The first ten number numerals are: I, II, III, IV, V, VI, VII, VIII, IX, and X.
Roman numerals chart from 1 to 100
Below we show the chart to convert numbers in hinduarabic system into roman numerals and viceversa from one to one hundred.
1 
I 
2 
II 
3 
III 
4 
IV 
5 
V 
6 
VI 
7 
VII 
8 
VIII 
9 
IX 
10 
X 
11 
XI 
12 
XII 
13 
XIII 
14 
XIV 
15 
XV 
16 
XVI 
17 
XVII 
18 
XVIII 
19 
XIX 
20 
XX 
21 
XXI 
22 
XXII 
23 
XXIII 
24 
XXIV 
25 
XXV 
26 
XXVI 
27 
XXVII 
28 
XXVIII 
29 
XXIX 
30 
XXX 
31 
XXXI 
32 
XXXII 
33 
XXXIII 
34 
XXXIV 
35 
XXXV 
36 
XXXVI 
37 
XXXVII 
38 
XXXVIII 
39 
XXXIX 
40 
XL 
41 
XLI 
42 
XLII 
43 
XLIII 
44 
XLIV 
45 
XLV 
46 
XLVI 
47 
XLVII 
48 
XLVIII 
49 
XLIX 
50 
L 
51 
LI 
52 
LII 
53 
LIII 
54 
LIV 
55 
LV 
56 
LVI 
57 
LVII 
58 
LVIII 
59 
LIX 
60 
LX 
61 
LXI 
62 
LXII 
63 
LXIII 
64 
LXIV 
65 
LXV 
66 
LXVI 
67 
LXVII 
68 
LXVIII 
69 
LXIX 
70 
LXX 
71 
LXXI 
72 
LXXII 
73 
LXXIII 
74 
LXXIV 
75 
LXXV 
76 
LXXVI 
77 
LXXVII 
78 
LXXVIII 
79 
LXXIX 
80 
LXXX 
81 
LXXXI 
82 
LXXXII 
83 
LXXXIII 
84 
LXXXIV 
85 
LXXXV 
86 
LXXXVI 
87 
LXXXVII 
88 
LXXXVIII 
89 
LXXXIX 
90 
XC 
91 
XCI 
92 
XCII 
93 
XCIII 
94 
XCIV 
95 
XCV 
96 
XCVI 
97 
XCVII 
98 
XCVIII 
99 
XCIX 
100 
C 
Rules to convert Roman numerals into Arabic numbers
Roman numerals are written using a combination of seven capital letters of the Latin alphabet whose values are as follows:

Ⅰ = 1

V = 5

X = 10

L = 50

C = 100

D = 500

M = 1000
To obtain the other expressible integers it is necessary to combine, that is to say, juxtapose, these symbols to obtain strings that respect the following rules.

The symbols are read from left to right.

Within a Roman numeral, the symbols I, X, C, and M can typically be repeated three times consecutively. On the other hand, the symbols V, L, and D can never be inserted more than once consecutively.

A sequence of symbols that never have increasing values denotes the total obtained by adding the values of the indicated symbols; For example, if the X is repeated, each X represents ten units: XXI = 11.

When a symbol is found followed by a second symbol of greater value, the result is the difference between them. Therefore, if between any two figures, there is a smaller one, it will subtract its value from the next one, such as IV = 4, IX = 9.

Strings made up of pairs of the above type and symbols are also acceptable, as long as you go from a pair to a pair of lesser value, from a symbol to a pair of both lower symbols, and from a pair to a lower symbol of both members of the couple

Only I, X, and C can be used subtractively.

The value of the Roman numerals is multiplied by a thousand times as many horizontal lines as are placed on top.
These rules mean that specific numbers can be expressed in more than one way: for these cases, the most concise writing is preferable.