1, Teacher Zhu introduced the new lesson very well. Understanding hectares is the first lesson in Unit 2. As we all know, the first lesson of each unit is not easy to talk about. It is necessary to understand the students' previous knowledge and change from the old to the new. Teacher Zhu first asked the students to say the area units they had learned, and arranged them in order from small to large. They consolidated the old knowledge through practice, and then showed the pictures of the green Expo, which made students realize that it is not appropriate to measure the area of the green Expo with the existing area units, which led to contradictions and cut into the new lesson. It is natural to link old knowledge with new knowledge.

2. The structure is reasonable and the level is clear. According to the difficulties in teaching, the process of teaching and learning should be clear at a glance, from easy to difficult, from simple to complex. The first is to get a preliminary understanding of hectares with data. Tiananmen Square, World Expo Park, Potala Palace and Hangzhou West Lake are all displayed with pictures, so that students can see them. After seeing it, I initially felt that the area of these famous scenic spots used hectares. Then let the students know the meaning of 1 hectare. By calculating the area of a square with a side length of 100 meters, we get 1 hectare = 10000 square meters. Consolidate the conversion between hectares and square meters through practice. The third is to perceive the size of 1 hectare, so that students can really feel the size of 1 hectare from the examples around them.

3. In this class, Mr. Zhu's design concept is novel, making full use of the teaching resources around him, and truly embodying the mathematical thought of "Mathematics comes from life and is applied to life". Unlike square meters, decimeters and centimeters, hectares can be perceived by things around them. Teacher Zhu uses the playground where we usually do exercises. There are five such playgrounds, with an area of about 1 hectare, and the area of our campus is about 3 hectares. This is a good breakthrough to this difficult point.