Question

Write in Roman Numerals $\left(a\right)69\left(b\right)98$.

Answer 1

Convert into Roman numbers.

$69$ can be written as $69=50+10+9$

In roman, $50$ is represented by $\mathrm{L}$, $10$ is represented by$\mathrm{X}$, and $9$is represented by $\mathrm{IX}$.

$$\begin{gathered} 69=50+10+9 \\ \Rightarrow =\mathrm{L}+\mathrm{X}+\mathrm{IX} \\ \Rightarrow =\mathrm{LXIX} \end{gathered}$$

Similarly,

$$\begin{gathered} 90=90+8 \\ \Rightarrow =\mathrm{XC}+\mathrm{VIII}\left[\mathrm{XC}=90\right] \\ \Rightarrow =\mathrm{XCVIII} \end{gathered}$$

Hence,

$$\begin{gathered} a.69=\mathrm{LXIX} \\ b.98=\mathrm{XCVIII} \end{gathered}$$