It is better to teach people to fish than to teach them to fish. Teachers should not only teach students knowledge, but also teach students learning methods. Line segment-the part between any two points on a straight line, is very simple to draw, but this simple line segment has played a wonderful role in the teaching of application problems in primary schools. Help junior and senior students learn simple and complex application problems easily and happily, and promote the development of students' thinking.

First, the line chart can make the quantitative relationship in the topic more vivid and intuitive.

Junior students are young and have limited understanding ability, so it is difficult to learn practical problems. In this case, guiding students to use line graphs to represent the numbers in the questions can make the quantitative relationship between them more intuitive and vivid, and make the application of the questions difficult and easy to learn. For example, there are 10 red goldfish and 8 black goldfish in the fish tank. How many more red goldfish are there than black goldfish? Question: Which of the two kinds of fish is more and which is less? There are many red goldfish, which can be represented by long lines (drawing), but few black goldfish. How to draw a line segment?

Second, line drawing can improve the accuracy of students' judgment.

The teaching of "greater than () ()" and "less than ()" is difficult. It is difficult for students to judge that "greater than () ()" is calculated by addition without analysis, and vice versa. The correct use of line segments can prevent students from making such wrong judgments. Example: There are 9 yellow flowers, 5 fewer than safflower. How many red flowers are there? Guide the students to draw and analyze: first draw the number of yellow flowers, and then know which flowers are more red by "less than red flowers". How to draw them?

Third, paragraph drawing can broaden students' thinking and help them solve more problems.

Drawing lines can broaden students' thinking and solve many problems skillfully. For example, the library has 150 science and technology books, and the story books are three times as many. How many story books are there than science books? The general solution is: 150× 3- 150 = 300 (Ben). But the application of line graph makes students have a simpler solution.