Question

A rectangular board is 1400 millimeters long and 900 millimeter wide

Answer 1

In order to find the area in square meters, first convert the length and width to meters:

$\begin{gathered} l:1400mm\times\frac{1m}{1000mm}=1.4m \\ w:900mm\times\frac{1m}{1000mm}=0.9m \end{gathered}$

then, find the area of the board through the formula:

$\begin{gathered} A=l\times w \\ A=1.4m\times0.9m \\ A=1.26m^2 \end{gathered}$

Answer:

The area of the board is:

$A=1.26m^2$