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What is the understanding of quantity in primary school mathematics?
Mass unit (ton, kilogram, gram)

Length unit (kilometer, meter, decimeter, centimeter, millimeter)

Area unit (square kilometer, hectare, square meter, square decimeter, square centimeter, square millimeter)

Unit of volume (cubic meter, cubic decimeter, cubic centimeter)

Unit of volume (L, mL)

Time unit (year, month, day, hour, minute, second)

Renminbi unit (circle, angle, minute)