Finding a quantity from a known total is called standardization. , calculated by division.

For example, Xiaoming's home is 500 meters away from school, and it takes 10 minutes to go to school. How many meters does she walk per minute on average?

Formula: 500÷ 10=50 (m)

What is induction? It means that a single quantity is known, and the total quantity is called induction, which is calculated by multiplication.

For example, there are three classes in the third grade, and each class plants 50 trees. How many trees have been planted in three classes?

Formula: 50ⅹ3= 150 (tree)