Answer
$0.45\;km^2=450000\; m^2$.
Work Step by Step
Conversion factor is
$=\frac{1000000\; m^2}{1\; km^2}$
The given unit of measure is
$=0.45\;km^2$
Multiply by the conversion factor.
$=0.45\;km^2\cdot \frac{1000000\; m^2}{1\; km^2}$
Simplify.
$=450000\; m^2$.
