☛ 1 hectare = 100 meters on each side , so a hectare has 100 m x 100 m = 10,000 m2

☛ A square millimetre is millimetres x millilitres; a millimetre is a thousand part of a meter, so a square millimetre is one millionth of a square meter

1 X 1 = 1 of a square meter

1000 1000 1,000, 000