The first picture should have been put by Mr. Xu, but I was so excited that I forgot to take the screenshot. Fortunately, there is playback, and the following picture is coming.
This is the first time I have met xu teacher. Although it is online, it is also the first time. As a primary school math teacher in the province, I feel very ashamed! Actually, I've heard about it for a long time, but I've never seen it. I always thought it was gay.
Xu teacher introduced that the main content of this seminar is to solve the urgent and difficult problems of online problems, focusing on cases and doing it through empirical research.
I listened to three classes online and gained a lot. Let's talk about it The first lesson is "Problem-solving Strategies-Hypothesis" brought by Xu Xin, the second experimental primary school in Laoshan District, Qingdao for six years.
First, the technical level:
Several functions are well used.
1. Timer function allows you to practice or move when you can see the time, with a sense of time and urgency.
2. Real-time image transmission of embedded courseware. Xu teacher, after the students finish the corresponding exercises, let the students send the pictures of the exercises to the home-school exchange group, then cut them out and embed them into the courseware, and then the students can speak against their homework, so that not only he can see them, but everyone can see them, and the students can easily enter the lecturer's thinking.
3. Answer card function, real-time answer statistics.
Xu teacher is also adept at using the answer sheet function. After finding the students with problems, he set up a support group, which not only gave the little teacher a chance, but also did not let any students fall behind.
Second, the teaching level:
1. Adjust the data and simplify the complex.
Make the textbook materials smaller, list them simply, and make the thinking clearer, without losing the thinking cultivation of trying to reason.
2. Multi-contact
The increase of painting method makes thinking visual.
Last month, the sixth grade of our school happened to talk about this lesson in mathematics teaching and research. At that time, Mr. Ge only used enumeration and arithmetic. At that time, I suggested that he draw. He said that no classmates would learn to draw in reality, so he gave up.
After listening to this lesson today, I feel that painting is really necessary. Xu teacher makes students' thinking clearer by drawing pictures and listing. The second contact is drawing with enumeration and arithmetic. The comparison of the three makes students' thinking move from concrete to abstract. In particular, teachers say graphics and students say formulas, which is modeling. Under the guidance of teachers, students have gone through the process of hypothesis, comparison and adjustment, and the application of hypothesis method has been fully developed. These three methods are actually based on assumptions, or attempts. In this class, I think the most important thing is to let students dare to try, dare to try and dare to adjust.
3. After-class exercises should be returned.
Through mathematical culture, xu teacher introduced some basic problems, such as chicken and rabbit in the same cage, turtle and crane algorithm, and variant lottery. Although there are no chickens and rabbits, we should use models to solve this kind of problems, and we should also use hypothetical methods to solve them. This is the method of transformation.
In the teaching and research last semester, we discussed the problem of planting trees. At that time, Teacher Li Bing said that the problem of planting trees should also cultivate students' conversion thinking, so I thought about what conversion was. The Hungarian mathematician Rosa explained this, which made me suddenly realize.
Suppose you have a coal stove, faucet and kettle in front of you. The task now is to boil water. What should you do? "
The correct answer is: fill the kettle with water, and then put the kettle on the gas stove!
Then the Hungarian mathematician Rosa asked the second question: Suppose all conditions remain the same, but there is enough water in the kettle, what should you do? In this regard, people often answer: light the gas and put the pot on the gas stove! But Rosa thinks this is not the best answer, because "only physicists will do this, and mathematicians will empty the water in the pot and claim that I have turned the latter question into the former one."
Listening to this lesson today reminds me of this story again. Through this training, I also learned a lot, and then I will put them into action!