MEASURES OF AREA

100 square millimeters (mm2) = 1 square centimeter (cm2)
100 square centimeters (cm2) = 1 square decimeter (dm2)
100 square decimeters (dm2­) = 1 square meter (m2)
100 square meters (m2) = 1 square decameter (dkm2)
100 square decameters (dkm2) = 1 square hectometer (hm2)
100 square hectometers (hm2) = 1 square kilometer (km2)
10,000 square centimeters (cm2) = 1 square meter (m2)
 1,000,000,000 square meters (m2) = 1 square kilometer (km2)
10,000 square meters (m2) = 1 hectare (ha)