This semester, I taught "Proportion" in Unit 4, Grade 6, Primary School Mathematics of Beijing Normal University. This lesson mainly combines the situation of "perimeter and side length of cube, area and side length of cube, distance, time and speed", and runs through the process of constructing the meaning of proportion, so that we can see "invariance" from the change and understand the proportion. And can judge whether two related quantities are in direct proportion according to the meaning of direct proportion, can cite examples of direct proportion in life, and feel the wide application of direct proportion in life. Let students experience mathematical activities such as comparison, analysis and induction. , improve their ability of analysis, comparison, induction and generalization, and get a preliminary understanding of function thought.
In teaching, I ask students to complete the table "perimeter and side length of a cube, area and side length of a cube" and talk about their findings and whether their changing rules are the same. On this basis, let the students complete the "distance, time and speed" table, talk about their findings, discuss and communicate in groups, and then give feedback to the whole class and write it on the blackboard in time. Play micro-lessons with "the teacher also wants to share my findings with you", and then complete the form with the students, observe the data and talk about the law of discovery, thus leading to the concepts of "positive proportion" and blackboard writing. At this time, the application of "micro-lesson" deeply attracted students to listen, and at the same time, the concept of "direct proportion" was reconstructed, which was clear and intuitive, greatly improving students' interest and enthusiasm in learning. The effect of this state can be imagined. Students not only have confidence in learning mathematics, but also love learning mathematics more.
The application effect of this kind of micro-course in concept class is very obvious. I will try to sum up my experience in the future, so that "micro-lessons" can better assist teaching in the classroom.