1 km =1000m1m =10 decimeter1decimeter = 10cm.

Area unit rate:

1 m2 = 100 square decimeter 1 square decimeter = 100 square centimeter

Unit ratio of plots:

1 km2 = 1 00ha1hectare =10000m2

Unit volume rate (volume):

1 m3 = 1000 cubic decimeter

1l =1000 ml1l =1cubic decimeter 1 mL = 1 cubic centimeter.

Mass unit rate:

1 ton = 1 000kg1kg =1000g

Time unit rate:

1 year = 12 months 1 day =24 hours.

1 hour =60 minutes 1 minute =60 seconds

Monetary unit rate:

1 yuan = 10 angle 1 angle = 10 minute.

(Note: Generally, when learning the propulsion rate, you only need to remember the propulsion rate between two adjacent units in a certain category, but you should strengthen your memory for special ones, such as 100, but 1 hectare = 10000 square meters. When converting units, we should also pay attention to whether these two units are adjacent, which is often wrong in practice. )