A "brain -open" mathematical lesson -listening to Huayinglong's "The Story of Tooth Selling Power" feels like

"Brain Cave" is one of the "Top Ten Conversion" released by the 2015 "Bite and Chewing" magazine. The "brain hole is open" means imagining the sky and horse, and the association is extremely rich and strange. Not long ago, at the seminar on the online observation seminar of Mathematics and Elementary School in Huayinglong Elementary School, after listening to the lesson "Story of Tooth Panels" coached by Mr. Hua, I learned that how to make students "comprehensive mathematics and practical lessons make students" The brain hole is open. "

"Brain hole" comes from keen life perception. This lesson originated from a small story in a leisure book "One Thousands of Gold": A company that produces toothpaste in the United States uses a method to increase the sales of toothpaste, which is to expand the toothpaste caliber by 1 mm. Teacher Hua also compiled a primary school graduation test based on this story: the exit of the toothpaste is 5 mm, and each time Xiaohong brushes his teeth, he squeezes soybean -sized toothpaste. In this way, a toothpaste can be used 36 times. The new packaging of the brand toothpaste has changed the diameter of the exit to 6 mm. Xiaohong is still a toothpaste of the same length according to the habit. How many times can this toothpaste? What do you think after calculation? Whether it is a story or a exercise, for us, maybe it is the fragmented information that usually browses, but Teacher Hua keenly discovered its unique value and used it as an excellent material for the comprehensive and practical courses of mathematics.

Compulsory education mathematics curriculum standard (2022 edition) emphasizes that "in actual situations and real problems, the use of knowledge and methods of mathematics and other disciplines to experience the process of discovering problems, raising problems, analyzing problems, and solving problems." Real situations and real problems are the basis for students to carry out comprehensive and practice, and "Story of Tooth Selling Paste" Based on these two true fragmented information, let us see the mathematical education resources contained in daily life.

The "brain hole is wide" and the connotation of rigorous knowledge. "The Story of Toothpaste" is the content of the "comprehensive and practice" of mathematics. It is necessary to observe the real world with the eyes of mathematics, think about the real world with mathematics thinking, and express the real world in the language of mathematics. What mathematics knowledge is this lesson? With the "change of change" as the core, Mr. Hua raised 5 questions: 1. What changes did you feel that from "diameter expansion of 1 mm" to "sales increased by 32%"? 2. How can the two quantities change, what can we use to describe? 3. In this series of changes, which set do you think is the most critical? 4. We need to study "what effect will the caliber expand for 1 mm", how do you think it is better to study? 5. Many classmates have only one group. Why do you count three groups? These 5 problems have been analyzed from the relationship between the variables to the result of quantitative research changes, allowing students to experience the whole process of discovering problems, raising problems, analyzing problems, and solving problems in the class. At the same time With a sense of innovation, it has cultivated students' core literacy.

The "brain hole" finally comprehensively educated people. When I heard the problem solved in this lesson, I had a question in my heart: This story has a rich connotation at the level of mathematics learning to dig, and through the practical teaching of Teacher Hua, students are rich and profound in mathematics learning. Experience, but is the value conveyed in this story correct? Will students strengthen incorrect values ​​because of the in -depth research and experience of the story? I do n’t know that the peak circuit turns, and Mr. Hua quoted a proposal of a representative of the National People's Congress: Compared with 20 years ago, the diameter of the toothpaste tube opening on the domestic market has quietly increased from 3-4 mm to about 8mm. "I have made a calculation. When the diameter of the toothpaste tube is 4 mm, it can save 75%of toothpaste compared to the 8 mm caliber every day." Then, Mr. Hua cleverly asked students to make students from the boss, consumers and leaders three three. Thinking at different perspectives, combined with this proposal to predict the company's yesterday, today, and tomorrow, let the students truly realize that "the mistakes of others and raise their own positive". At this time, I realized that Teacher Hua ambushed the "wrong" of values ​​in the classroom, and cleverly used the way of thinking to trigger students' attention and analysis of social reality, thereby building correct values. Practical lessons across the discipline to educate the extremely valuable attempt. Mathematical teaching must not only teach mathematical knowledge and skills, but also carry the heavy responsibility of socialist builders and successors who have developed a comprehensive development of "ideal, identical, and responsible". This lesson is over, but from another perspective, it is another starting point for students to grow up.

As a teacher, I often think about, what kind of person do our education be cultivated? How to cultivate people? What is the trained person? Teacher Hua's lesson made me realize that in order to give full play to the important value of math's "comprehensive and practice" in educating people, it must be "brain open".

Although the class is ended, the road is unfolding ...

(Author: Chen Chang unit is Shapingba Elementary School in Chongqing University)

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