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The unit of weight and length in primary school mathematics. All of them
Length unit:

10mm = 1 cm

100 mm = 1 decimeter

1000 mm = 1 m

10cm = 1 decimeter

100 cm = 1 m

10 decimeter = 1 meter

1000 m = 1 km

Weight unit:

1000g = 1kg

1000kg = 1t

Area unit:

100 mm2 = 1 cm2

10000 mm2 = 1 mm2.

100 square centimeter = 1 square decimeter

10000 cm2 = 1 m2

10000 m2 = 1 hectare

100 hectare = 1 km2

Unit of volume:

1000 cubic millimeter = 1 cubic centimeter

1000 cubic centimeter = 1 cubic decimeter

1000 cubic decimeter = 1 cubic meter

1000 cubic meter = 1 cubic kilometer