Solution: The weight of an apple is known as 1kg.

Then the weight of five apples is 5* 1=5(kg).

Five apples weigh five kilograms.

Multiplication:

(1) How much is a few.

(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 out one of them.

② Find out how many other numbers are in a number.

(3) Given a fraction or percentage of a number, find this number.

(4) Find a number that is several times that of another number.

application problem

It uses language or words to describe relevant facts and reflect some mathematical relationship (such as quantitative relationship and positional relationship). ) and solve unknown problems. Each application problem includes known conditions and problems.

In the past, China's application problems usually required narrative to meet three requirements: no contradiction, that is, conditions and problems could not be contradictory; Completeness, that is, the condition must be sufficient to ensure that the value of the unknown quantity can be obtained from the condition; Independence, that is, several known conditions cannot be deduced from each other.

Mathematics application problems in primary schools are usually divided into two categories: simple application problems that can be solved in one step only by addition, subtraction, multiplication and division; Complex application problems that need two or more operations to solve.