The Roman numeral for \(1\) is \(\mathrm{I}.\)

The Roman numeral for \(10\) is \(\mathrm{X}.\)

The Roman numeral for \(100\) is \(\mathrm{C}.\)

When Roman numerals are written in order from largest to smallest, their values are added.

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Example: What does \(\mathrm{CII}\) represent?

The \(\mathrm{C}\) is worth \(100\) and each \(\mathrm{I}\) is worth \(1.\) Add the numbers to find the total value.

\begin{align} \mathrm{CII} & = 100 + 1 + 1 \\ & = 102 \end{align}

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Example: Write \(23\) in Roman numerals.

To write \(23\) in Roman numerals, first write it as a sum of \(10\)'s and \(1\)'s. \begin{align} 23 & = 10 + 10 + 1 + 1 + 1 \\ & = \mathrm{XXIII} \end{align}