Question

Add the number and write the sum as a Hindu Arabic numeral : $\mathrm{XXVIII},\mathrm{XIV},\mathrm{CXII},\mathrm{CDXV}$

Answer 1

Step:Finding the sum.

$$\begin{gathered} \mathrm{I}=1,\mathrm{X}=10,\mathrm{V}=5,\mathrm{CDXV}=(\mathrm{D}-\mathrm{C})+\mathrm{X}+\mathrm{V} \\ \mathrm{XXVIII}=10+10+8 \\ =28 \\ \mathrm{XIV}=10+4 \\ =14 \\ \mathrm{CXII}=100+12 \\ =112 \\ \mathrm{CDXV}=(500-100)+10+5 \\ =400+10+5 \\ =415 \end{gathered}$$

Sum of the numbers

$$\begin{gathered} =28+14+112+415 \\ =569 \end{gathered}$$

Hence, the sum of the numbers will be $569$.