2. The second method:

These two methods can actually be taken as 10 rows, and the number of rows is represented by the black line on the diagram, and each row has 3 trees.

Extended data

Benefits of drawing and solving problems:

1, with the help of drawing to solve problems, abstract language can be transformed into concrete, vivid and intuitive graphics.

With the help of drawing, it is possible to make things simple and make accurate judgments. Some application problems are complicated in quantity, so it is difficult for students to sort them out. With the help of line graph, the corresponding relationship between quantity and quantity can be found accurately, and it is easy to solve the required problems.

3. With the help of drawing, we can simplify the complex and develop students' thinking. Some application problems are so large that students feel confused and easily confused.

With the help of drawing, you can turn knowledge into ability. Line drawing not only makes it easier for students to solve application problems, but also helps to cultivate students' various abilities.

For example, the cultivation of multi-solution ability of one question, the preparation of application questions according to line segment diagram, the cultivation of speaking ability, and the calculation of determinant directly according to line segment diagram. The line drawing structure is elegant and reasonable, and it can also cultivate students' aesthetic concept and artistic ability.

Drawing plays a wonderful role in the teaching of mathematical application problems in primary schools. It can help students learn complex application problems easily and happily, which not only cultivates their ability, but also promotes the development of their thinking. It is an effective teaching method in teaching.