Answer
a) $0.000215 km^{2}$.
b) $21500 dm^{2}$
c) $2.15 \times10^{6} cm^{2}$.
Work Step by Step
a) To convert from $m^{2}$ to $km^{2}$, we divide the area by 1000000 because $1 km^{2}=1000000 m^{2}$. $215 m^{2}×\frac{1 km^{2} }{1000000 m^{2} }=0.000215 km^{2}$.
b) To convert from $m^{2}$ to $dm^{2}$, we multiply the area by 100 because $1 dm^{2}=100 m^{2}$. $215 m^{2}×\frac{100 dm^{2} }{1 m^{2} }=21500 dm^{2}$.
c) To convert from $m^{2}$ to $dm^{2}$, we multiply the area by 10000 because $1 cm^{2}=10000 m^{2}$. $215 m^{2}×\frac{10000 cm^{2} }{1 m^{2} }=2.15 \times10^{6} cm^{2}$.
