Addition is one of the four basic operations, which refers to the calculation of combining two or more numbers and quantities into one number and quantity. The symbol of addition is the plus sign "+". Connect items with a plus sign when adding.

Multiplication:

(1) How much is it?

(2) How many times is a number;

③ Find the area and volume of the object;

(4) Find the fraction or percentage of a number.

Department:

(1) divide a number into several parts on average and find one of them;

(2) How many other numbers are there in a number;

(3) What fraction or percentage of a number is known to find this number;

Find out how many times one number is another.