Primary school mathematics has the content of multiplication operation law, which is very important in primary school mathematics calculation learning. There are three main types: multiplicative commutative law, multiplicative associative law and multiplicative distributive law.

Multiplication and exchange law: when two numbers are multiplied, the position of the exchange factor remains unchanged.

Multiplication and association law: when three numbers are multiplied, the first two numbers are multiplied first, or the last two numbers are multiplied first, and the product is unchanged.

Multiplication and distribution law: the sum of two numbers is multiplied by a number, which can be multiplied separately and then added.