500/m^2 = (500/m^2)*((1m)/(100cm))^2 = 500/(10000 cm^2) = .05/cm^2
500 m^2 = (500 m^2)*((100 cm)/(1 m))^2 = 500*10,000 cm^2 = 5,000,000 cm^2
500 m^2 = (500 m^2)*((100 cm)/(1 m))^2 = 500*10,000 cm^2 = 5,000,000 cm^2