Roman numerals to 100

​​In a nutshell

Before the numbers that are used today existed, the Romans used letters to express positive numbers.

1, 5, 10, 50 and 100

Up to $$100$$, there are five capital letters used in the Roman numerals to represent $$1, 5,10,50$$ and $$100$$:

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Every other number up to 100

In order to represent all the other numbers up to $$100$$ using Roman numerals, there are a series of rules that must be followed.

Rule 1.

Numbers represented by symbols are added up from left to right.

Example 1

III is equal to $$1+1+1=3$$

Rule 2. 

The symbols are written and added in order, left to right, from largest possible values.

Example 2

​$$56$$ is represented by LVI $$=50+5+1$$​ and not XXXXXIIIIII $$=10+10+10+10+10+1+1+1+1+1+1$$​

Rule 3. 

Where a smaller number is placed to the left of a larger one, take away from the value on the right. Symbols cannot be used more than three times in a row.

Example 3

​$$4$$ is represented by IV $$=5-1=4$$ and not IIII $$=1+1+1+1=4$$

Listed are the Roman numerals from one to fifty:

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​$$\begin{array}{c|c|c|c|c|c|c|c|c|c}\bold{1}&\text{I}&\bold{11}&\text{XI}&\bold{21}&\text{XXI}&\bold{31}&\text{XXXI}&\bold{41}&\text{XLI}\\ \hline\bold{2}&\text{II}&\bold{12}&\text{XII}&\bold{22}&\text{XXII}&\bold{32}&\text{XXXII}&\bold{42}&\text{XLII} \\ \hline\bold{3}&\text{III}&\bold{13}&\text{XIII}&\bold{23}&\text{XXIII}&\bold{33}&\text{XXXIII}&\bold{43}&\text{XLIII} \\ \hline\bold{4}&\text{IV}&\bold{14}&\text{XIV}&\bold{24}&\text{XXIV}&\bold{34}&\text{XXXIV}&\bold{44}&\text{XLIV} \\ \hline\bold{5}&\text{V}&\bold{15}&\text{XV}&\bold{25}&\text{XXV}&\bold{35}&\text{XXXV}&\bold{45}&\text{XLV} \\ \hline\bold{6}&\text{VI}&\bold{16}&\text{XVI}&\bold{26}&\text{XXVI}&\bold{36}&\text{XXXVI}&\bold{46}&\text{XLVI} \\ \hline\bold{7}&\text{VII}&\bold{17}&\text{XVII}&\bold{27}&\text{XXVII}&\bold{37}&\text{XXXVII}&\bold{47}&\text{XLVII} \\ \hline\bold{8}&\text{VIII}&\bold{18}&\text{XVIII}&\bold{28}&\text{XXVIII}&\bold{38}&\text{XXXVIII}&\bold{48}&\text{XLVIII} \\ \hline\bold{9}&\text{IX}&\bold{19}&\text{XIX}&\bold{29}&\text{XXIX}&\bold{39}&\text{XXXIX}&\bold{49}&\text{IL} \\ \hline\bold{10}&\text{X}&\bold{20}&\text{XX}&\bold{30}&\text{XXX}&\bold{40}&\text{XL}&\bold{50}&\text{L} \end{array}$$​​

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