Question

A rectangular sheet of paper is $12\frac{1}{2}\mathrm{cm}$ long and $10\frac{2}{3}\mathrm{cm}$ wide. Find its perimeter.

Answer 1

Perimeter of rectangle = 2(length + width)

$$\begin{gathered} 2\times \left[12\frac{1}{2}+10\frac{2}{3}\right] \\ =2\times \left[\frac{(12\times 2)+1}{2}+\frac{(10\times 3)+2}{3}\right] \\ =2\times \left[\frac{(25\times 3)+(32\times 2)}{6}\right] \\ =2\times \left[\frac{139}{6}\right] \\ =\frac{139}{3}\mathrm{cm} \end{gathered}$$