1, unit of length measurement and forward speed: kilometer (km), meter, decimeter, centimeter and millimeter.

1 km = 1 km, 1 km = 1000 m, 1 m = 10 decimeter,

1 decimeter = 1 0cm,1cm =10mm.

2. Area measurement unit and input rate: square kilometers, hectares, square meters, square decimeters,

Square centimeter

1 km2 = 100 hectares, 1 km2 = 100000 m2,

1 hectare = 10000 square meters, 1 square meter = 100 square decimeter,

1 square decimeter = 100 square centimeter

3. Volume measurement unit and rate: cubic meter, cubic decimeter, cubic centimeter, liter and milliliter. 1 m3 = 1000 cubic decimeter, 1 cubic decimeter = 1000 cubic centimeter.

1 cubic decimeter = 1 liter, 1 cubic centimeter = 1 ml.

4. Mass units and ratios: tons, kilograms, kilograms and grams.

1 ton = 1 000kg, 1 kg = 1 kg,1kg =1000g.

6. Time unit and forward speed: century, year, month, day, hour, minute and second.

1 century = 100, 1 year = 1 February (months with 3 1 day are1,March, May, July, August, 10.

1 min =60 seconds.