"Meeting problem" is a difficult point in the teaching of application problems in grade four, so when explaining this part of knowledge points, I carefully studied this knowledge point and tried to find a solution with twice the result with half the effort. After careful consideration, combined with the situation of students in this class, I decided to teach this knowledge point to students in two classes. The specific method is as follows:

The first class: this class is mainly a basic class.

At the beginning of the course, lead students to review the relationship between "time, speed and distance" to pave the way for new knowledge. Then the key point is to guide students to understand the concept of the key words "meeting, simultaneous and relative (relative)". The main methods are practical demonstration, game and spatial imagination, so that students can understand the most critical words in this part of knowledge. Then I began to give an example of traveling in combination with the actual life of students. First ask the distance, then change the question to ask the time, and then ask the speed of a party. In the process of students' answering questions, I mainly let students give full play to their imagination by observing the graphics, and let students sum up the methods to solve each problem by themselves through group cooperation and communication. Finally, it will be consolidated with practice.

The second category: the expansion of knowledge.

I mainly analyzed the extension of the knowledge involved after class, and then led the students to sum up: 1, at the same time, face to face, not to meet each other. 2. Face to face and meet at different times. 3. Back to back? After a lot of practice, I will expand my knowledge into my work and let students understand that the solutions to this kind of application problems are similar and basically the same. In this way, the problems of students seeking time, efficiency and workload in their work will be solved.