In this lesson, Mr. Song's presupposition of generating space and wise guidance for students to effectively construct knowledge in the process of generating are impressive.

At the beginning of class, Teacher Song encouraged students to fold up their learning tools and draw a picture. This sentence is like a stone thrown into calm water, which arouses students' strong thirst for knowledge and leaves enough time and space for students of different levels to think. This flexible presupposition makes students produce many wonderful things. Through hands-on operation, the students found a box of chocolates with round, square and line segments respectively.

12 pieces of 8 sticks 1/4. Through students' orderly feedback and thinking collision, the teacher's bow guides students to clearly understand the unit. It is this process that naturally and skillfully explains the first important and difficult point of this lesson. Reading the new curriculum standards, we clearly realize that everything is for the development of every student. This is the highest purpose and core idea of teaching.

This is also a dynamic generation process. When studying the meaning of scores, Mr. Song makes full use of students' existing knowledge, allowing students to prepare their own materials and create their favorite scores. According to the ever-changing scores created by students and the effective guidance of teachers, teachers and students cooperate with each other. What does Miao Dai's score mean? It skillfully breaks through the second difficulty.