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What are the fast math calculation units in the fourth grade?
Time unit: century, year, month, day, hour, minute and second.

Length units: light years, kilometers, meters, decimeters, centimeters and millimeters.

Area units: hectares, square meters, decimeters, centimeters, millimeters and nanometers.

Unit of volume: cubic kilometer, cubic meter, cubic decimeter, cubic centimeter, cubic millimeter and cubic nanometer.