It depends on the specific situation in the topic. When calculating the total, for example, there is a car full of pears, a car full of 20 boxes, each box with 5 floors, each floor 10. How many pears are there in this car? This requires the multiplication of 10×5×20= 1000.

The problem of normalization is divided by division or even division, such as 1000 pears? A * * * contains 20 boxes, each with 5 layers. How many pears are there on each floor?

This requires 1000÷20÷5= 10 (pieces).

I hope it helps you! !