First the metres must be unsquared, converted to centimetres, then squared. Sq. root 500 = 22.36 22.36m = 2236cm 2236.06...x2236.06...=5,000,000cm 2. More simply, just multiply by 10,000 (because for metres to become centimetres you multiply by 100, but since it is metres squared you multiply be 100 again, so 10,000 (100x100).