"Countermeasures" is the content of Example 4 of "Mathematics Wide Angle" in the first volume of the fourth grade of the curriculum standard experimental textbook published by People's Education Press. Teacher Wang's class is based on students' development, with games and stories as the mainstay, infiltrating mathematical thinking methods, and the teaching design is gradual and fascinating. Students have a strong interest in learning and active thinking, which effectively realizes the transformation of learning methods, makes mathematics learning a process of continuous development of students' subjectivity and initiative, and successfully interprets the new concept of "student-oriented development" advocated by curriculum standards. From the teaching process, it has the following outstanding characteristics:

1. Inspire interest in a pleasant atmosphere with the help of game stories.

Interest is the best guide to learning. In this lesson, Mr. Wang fully grasped the psychological characteristics of primary school students, such as being playful, active, curious and competitive. In the introduction of new classes, he used poker games to stimulate interest, in the teaching of new knowledge to arouse doubts, in the process of consolidating practice, he used historical stories of "Tian Ji horse racing" and sports competitions to stimulate thinking, and integrated the study of abstract game theory methods into lively and interesting activities, creating a happy and harmonious atmosphere.

2. Cleverly set up inquiry activities and collide with wisdom in interactive communication.

Meaningful learning is self-constructed by students through effective activity experience in specific situations. In the teaching of this course, with an accurate grasp of the teaching content and students' learning situation, Mr. Wang rationally develops teaching materials, designs challenging, exploratory and open activities, guides students to think independently, explore independently, cooperate and communicate, and finds out countermeasures to adapt to current problems. Teacher Wang let students experience two effective inquiry activities:

(1) Preliminary exploration. After two rounds of chess between teachers and students, I felt that Cam lost first, sometimes lost and sometimes won, and initially discovered the secret of winning. (2) the group asked. Complete the form through cooperation, and deeply study how many ways to play small cards and how to play cards to win. In the interactive communication, the wisdom of teachers, students and students constantly collides. Through comparison, it is found that six different ways of playing cards have only one chance to win, which forms the consciousness of finding the optimal solution from various schemes and also cultivates the habit of students thinking about mathematical problems in an orderly way.

3. Advocate positive thinking and realize thinking in questioning and reflection.

In the present and future society, there are not many opportunities for students to directly apply what they have learned in school, but they are more influenced and enlightened by mathematical thinking methods. "Mathematics Wide Angle", as a new knowledge section in the curriculum standard experimental textbook of People's Education Press, one of its general ideas is to systematically and step by step infiltrate mathematical thinking methods, and try to present important mathematical thinking methods in a simple and understandable form with vivid and interesting examples. On the one hand, Mr. Wang Can accurately grasps the teaching objectives and tasks of this course, on the other hand, he constantly asks questions in the implementation process, creates cognitive conflicts, arouses students to think positively, and puts forward methods to solve problems, so that students can feel how to make correct judgments and choices when facing practical problems, so as to overcome the strong with the weak and truly appreciate the profound charm of the optimized mathematical thinking method of operational research.

4. Reasonably develop teaching materials and realize value in solving problems.

Mathematics Curriculum Standard points out that teachers should actively use all kinds of teaching resources, creatively use teaching materials and design teaching processes suitable for students' development. It is necessary to create a learning situation that is closely related to students' living environment and knowledge background and that students are interested in, so that students can gradually experience the generation, formation and development of mathematical knowledge in activities such as observation, operation, speculation, exchange and reflection, gain positive emotional experience, feel the power of mathematics and master the necessary basic knowledge and skills. Based on the above ideas, Mr. Wang gave full play to his creativity, rationally developed teaching materials and carefully designed a series of learning materials that are close to students' lives and meet their needs. This kind of material not only makes students feel cordial and true, but also makes students realize the value and significance of the optimization thought of operational research in the process of solving practical problems, and forms the consciousness of "loving strategy and using strategy".

To sum up, this course is indeed a successful course with strong teaching effectiveness and practice of new educational concepts.