First of all, talk about textbooks.
1, the content of this lesson: the standard experimental textbook of compulsory education curriculum published by People's Education Publishing House, the second section of chapter 5 of the first volume of fifth grade mathematics, the area of triangle.
2. The position, function and significance of teaching content.
The calculation of triangle area is based on fully understanding the characteristics of triangle and mastering the calculation of rectangle, square and parallelogram area. Through this part of the study, students can correctly understand and master the calculation formula of triangle area, learn to solve simple practical problems with formulas, and deepen their understanding of the internal relationship between triangle and rectangle, square and parallelogram.
3. Determination of the teaching objectives of this class.
According to the new teaching concept, the arrangement characteristics of teaching materials and the learning needs of students, I have formulated the following teaching objectives:
Knowledge and skills: enable students to master the formula for calculating the area of a triangle on the basis of understanding, and correctly calculate the area of a triangle.
Methods and process: Guide students to experience the exploration process of triangle area calculation and understand the calculation formula of triangle area.
Emotional attitude and values: in the process of exploration and learning, cultivate students' practical ability, cooperative spirit and innovative spirit.
4. Determination of teaching emphases and difficulties.
This lesson is mainly for students to acquire knowledge through operation. Guide students to discover the internal connection between knowledge in the process of operation.
Teaching emphasis: guide students to participate in the whole process of derivation of triangle area calculation formula.
Teaching difficulties: guide students to discover the internal relationship between graphics in practice.
Second, talk about teaching methods and learning methods.
In the teaching process of this course, let students participate in the operation practice extensively, so that students' ability to solve problems by using mathematical knowledge can be developed.
This course adopts the teaching method of combining experimental operation, guidance and explanation. Stimulate students' interest in learning through hands-on operation, demonstration and discussion. Encourage students to acquire knowledge and make a summary through independent exploration and group discussion. Then the information is collected and processed, and the calculation formula of triangle area is deduced.
Third, talk about the teaching process
According to the teaching objectives of this class and the actual situation of classroom teaching in rural primary schools, I have formulated the following teaching procedures.
(A) the creation of situations, the introduction of new courses
By reviewing the old knowledge closely related to the new knowledge, let the students calculate the areas of rectangles, squares and parallelograms, and review the topics that reveal the characteristics of triangles.
(2) Independent exploration, cooperation and exchange.
1, explore operation in groups.
2. Group presentation and communication.
3. discuss the problem.
① What is the relationship between the area of each triangle and the area of the original figure?
② What is the relationship between the base and height of each triangle and the base and height of the original figure?
4. Guide students to analyze, summarize and solve problems.
5. The teacher summed up the area formula of triangle.
(3), the use of knowledge
First, use the formula to solve textbook example 2. Find two poor students to perform the calculation process on the blackboard, and the teacher will correct it collectively. Secondly, according to the needs of students at different levels, multimedia shows exercises at different levels, and students practice and consolidate.
(4) Teacher's summary after class.
(5) assign homework.