Thoughts on the teaching of multiplication and division in mathematics in senior two.
This lesson is based on the students' preliminary understanding of the meaning of multiplication, learning the formula of 2-5 multiplication. The purpose of the content arrangement of this lesson is to help students deepen their understanding of multiplication. That is to say, when one of several fractions is different from one of them, you can first find the sum of several identical addends by multiplication, and then add the different numbers. You can also assume that each score is the same, calculate by multiplication, and then subtract all the parts. Through the study of this lesson, students should realize that the methods of solving problems are different because of different angles of observation and thinking. Let students experience the diversity of different problem-solving methods and strategies in the process of independent exploration and cooperative communication. Students have a preliminary understanding of multiplication, learned the formula of 2-5 multiplication, felt the significance of multiplication operation, and initially possessed the consciousness of calculating by multiplication. In this class, I take students as the main body and adopt the teaching mode of independent inquiry to teach.
Based on the understanding of teaching materials, my teaching design starts from the following aspects, combining calculation with use.
1, use the topic diagram, in order to use derivation.
By asking students to observe the theme map and ask mathematical questions, the main teaching content of this lesson-multiplication and division method is introduced, which is one of the intentions of setting up the theme map and the first combination of calculation and application in this lesson-using derivation. It is the second combination of calculation and application in this lesson to let students feel the internal relationship between formulas and pictures and prove their intuitive understanding by trying to calculate. In the design, I paid full attention to the combination of these two calculations and tried to reflect their combination.
2, schema combination, can use clear reasoning. In the design, I pay attention to the link of students exploring arithmetic through schema combination and mental arithmetic, which not only helps students master the calculation method, but also helps students explore and understand arithmetic effectively.
Disadvantages:
1, in group discussion, students should first think independently, and then conduct group communication and class discussion on the basis of independent thinking, and finally guide students to summarize their own calculation methods.
2. When understanding the meanings of multiplication, division and addition, subtraction, multiplication and division, the guidance is not accurate enough, which leads to students' incomprehension and inability to speak.
3. In this lesson, we put forward a variety of algorithms, but there is no optimization algorithm.
Because the time is not accurate enough, the later exercises are not finished.
Improvement measures: in the future teaching, we should think from the perspective of students. When preparing lessons, you should analyze the key contents thoroughly. Organize the guide language and let the students understand it in concise language.