Current location - Training Enrollment Network - Mathematics courses - The formula of method of substitution sum combination method in grade four
The formula of method of substitution sum combination method in grade four
The formulas of exchange law and associative law in grade four are as follows:

Exchange law: additive commutative law: A+B = B+A; ; Multiplicative commutative law: a× b = b× a. associative law: additive associative law: (a+b)+c = a+(b+c); The law of multiplicative association: (a × b) × c = a × (b × c).

The formulas of commutative law and associative law in grade four are basic concepts in mathematics. Commutative law refers to changing the order of numbers in addition or multiplication, and the result remains the same. These formulas are the basis of mathematical operations, and it is very important for fourth-grade students to master these formulas.