Length unit conversion: 1 km =1000m1m =1decimeter1decimeter =10cm1m =10cm.

Area unit conversion: 1 km2 = 100 hectares 1 hectare = 10000 m2 1 m2 = 100 m2.

Unit of volume conversion: 1 m3 = 1000 cubic decimeter 1 cubic decimeter = 1000 cubic centimeter 1 cubic decimeter = 1 liter 1 cubic centimeter =/kloc-0.

Weight unit conversion:1t =1000kg1kg =1000mg1kg =1kg.

Formula of unit conversion skills in grade four

To learn unit conversion well, memorizing formulas is the first step, followed by mastering the following two formulas. When the two are combined into one, it is foolproof and the questions are basically correct.

Units are converted into sizes, large units are converted into small units with × propulsion rate, and small units are converted into large units with propulsion rate. When encountering the problem of unit conversion, the first thing to look at is whether to change from a large unit to a small unit or from a small unit to a large unit. The method is completely different.

Once a child's mathematical thinking is turned on, it will be out of control. Parents of children in lower grades should not treat grades excessively. The key is to cultivate children's good habit of independent thinking.

Parents should be happy when children ask their parents questions. They should praise children for asking questions at the first time. In addition, we should also guide children to come up with their own answers and get the answers through repeated thinking. Never tell the answer directly when the child asks the parents. After a long time, children will not think and will not rely entirely on others.