a) \(\displaystyle{\rm{}}45{\rm{d}}{m^2} = {{45} \over {100}}{m^2} = {9 \over {20}}{m^2}\;;\)
b) \(\displaystyle300c{m^2} = {{300} \over {10000}}{m^2} = {3 \over {100}}{m^2}\;;\)
c) \(\displaystyle57500m{m^2} = {{57500} \over {1000000}}{m^2} \)\(\displaystyle= {{23} \over {400}}{m^2}.\)
