Introduction: "average" is the teaching content of unit 10 statistics in the sixth volume of compulsory mathematics education standard experimental textbook. The following is the average lecture draft of junior high school that I compiled for you. Welcome to read and learn from!

I. teaching material analysis

(A) the status and role of teaching materials

This lesson is the content of the first section of chapter 20 "data analysis" in the second volume of eighth grade mathematics of People's Education Press. Mainly let students understand the basic statistics in data statistics, which is a conceptual course and the basis for students to learn to analyze data and make decisions. The content of this lesson is closely related to students' life and can directly guide students' life practice.

(B) Teaching objectives and requirements

Knowledge objective: Understand the meaning of arithmetic mean and weighted mean, master the calculation methods of arithmetic mean and weighted mean, and clarify the functions of arithmetic mean and weighted mean in data analysis.

Ability goal: to calculate the average value of a group of data and cultivate the ability of independent thinking, innovation and teamwork;

Emotional goal: to experience the multifaceted nature of things and the necessity of learning to comprehensively analyze problems, infiltrate the moral concept of honesty and progress, and cultivate the spirit of hardship and innovation.

(C) the focus and difficulty of teaching

Teaching emphasis: the concepts of arithmetic mean and weighted mean and their calculation and determination methods;

Teaching difficulties: calculation of average, understanding and operation of weighted average.

Second, teaching methods and learning methods.

Teaching method design

This course uses multimedia teaching platform; In concept teaching, with life examples as the background, the concepts of three statistics are abstracted from concrete facts, and the practice of calculating and determining the three statistics helps students understand and consolidate the concepts. In teaching activities, students are mainly inspired by questions, and students are attracted and motivated by vivid and interesting examples; In the whole process, the situational teaching method is adopted.

At the same time, it pays attention to cultivating students' reading comprehension ability and group cooperation ability. In the teaching process, students mainly explore, think, discuss and learn from each other in groups.

The new curriculum concept emphasizes that the experience process is as important as the conclusion, but I think sometimes the process is more meaningful than the conclusion. I adopted inquiry teaching method, and the whole inquiry learning process is full of communication and interaction between teachers and students, which shows that teachers are organizers, guides and collaborators of teaching activities, and students are the main body of learning.

2. On the guidance of learning methods, this course aims at students' cognitive laws and guides students to explore concepts, exchange and cooperate, and experience the learning process of discovering, exploring and solving problems according to the principles of students' autonomy and difference. Participate in the occurrence, development and formation of knowledge, so that students can master knowledge.

3. Teaching methods

Using multimedia teaching can stimulate students' desire to explore knowledge, and effectively improve classroom teaching effect through intuitive demonstration.

Third, the design description

According to the requirements of the new curriculum and the intention of compiling the teaching materials, I followed the following principles when designing this section: introducing painting to stimulate interest, autonomous learning process, gradual construction of knowledge and infiltration of thinking methods.

Fourthly, the analysis of teaching process.

This lesson follows the following four processes.

Look at pictures to stimulate interest, use opportunities to introduce cooperation and exchanges, explore and apply new knowledge guidance, deepen and consolidate comprehensive exercises, and develop thinking.

(1) Create a situation to stimulate interest (about 3 minutes)

The introduction uses pictures to introduce students, through which students can fully experience the necessity of comprehensive understanding and analysis of data. Showing pictures is also an effective way to concentrate students' attention.

(b) Cooperation and exchange to build new knowledge

Ask questions when students are full of interest, how to find the average age and average height, get the concept of average on the basis of students' existing knowledge, and then organize students to discuss the displayed problems to see if Xiaoming's algorithm is correct, so as to discuss and summarize the concept of weighted average. It is not enough to let students know the arithmetic average in practical problems, so as to stimulate students' desire for further knowledge and achieve the purpose of gradual and in-depth teaching.

Then use what you have learned to solve a practical problem, a job application problem that is very close to reality. The design of the first question is very simple, and it is easy to find it by arithmetic average. Then, show the second question, give the correct answer to each number, and let the students explore how to solve it with the knowledge they just learned. Students have a sense of longing, so it is easy for them to strengthen and improve new knowledge. After the students get the answer, the teacher gives comments and encouragement, and then carries out variant training. At this time, let the students finish independently and learn to compete.

When students disagree, the teacher puts forward a summary of the knowledge of this lesson, so that students can give full play to their opinions, and finally end the new lesson and assign homework. The whole class is in good order and the students are in a good mood.

Fifth, pay attention to process evaluation.

1, focusing on the diversification of evaluation contents.

Through classroom activities such as students' showing their understanding of what they have learned, exchanging views on a certain question and trying to answer various questions, teachers can understand students from many aspects, such as their thinking activities, their understanding and mastery of relevant content, and their participation in activities.

2. Pay attention to the evaluation of students' learning process.

In the whole teaching process, students' participation in mathematics activities, self-confidence, awareness of cooperation and communication, habit of independent thinking and ability to find problems are evaluated and encouraged.

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