The penetration rate of all adjacent length units is 10, followed by 1m equals 10 decimeter, 1 decimeter equals 10 centimeter, that is, 1m equals 10 decimeter,/kloc. But the forward speed between km and m is 1000, which means 1 km = 1000 m.

Memory skills of unit conversion rate;

1. Units of length measurement and forward speed: kilometers (kilometers), meters, decimeters, centimeters and millimeters.

1 km = 1 km, 1 km = 1 000m, 1 m = 1 decimeter,1decimeter =10cm.

2. Mass unit and input rate: tons, kilograms, kilograms and grams.

1 ton = 1 000kg, 1 kg = 1 kg,1kg =1000g, which is called Qian Qian for short.

3. Units and ratios of area measurement: square kilometers, hectares, square meters, square decimeters, square centimeters and square millimeters.

1 km2 =100ha,1hectare = 10000 m2, 1 m2 = 100 m2,1m2 =100m2.