RMB unit and its forward speed: 1 yuan = 10 angle = 10 minute.

Time unit and its propulsion rate: 1 century = 100 = 10 month =3 1 (or 30 or 28 or 29) days =24 hours =60 minutes =60 seconds.

Mass unit and its speed:1t =1000 kg =1000 g.

Area unit and its propulsion rate:1km2 =100ha =10000m2 =100cm2 =100mm2.

Volume and its forward speed: 1 m3 = 1000 cubic decimeter = 1000 cubic centimeter = 1000 cubic millimeter.

Unit of volume and its rate: 1L = 1000ml.

The relationship between unit of volume and unit of volume: one liter = one cubic decimeter, and one milliliter = one cubic centimeter.

Area of rectangle = length × width

Area of a square = side length × side length

Area of cuboid = (length× width+length× height+width× height) ×2

Area of cube = side length × side length ×6

Cuboid volume = length × width × height

Volume of cube = side length × side length × side length

Area of circle: the square of radius times 3. 14.