Teacher: Children, when we first met, Teacher Jiang was very happy. We have a special fate and can have classes together. Do you know my last name? (Jiang)

Evaluation: Really listen! You (we) come to class with ears.

Teacher: What is your math teacher's last name?

Teacher: Please observe carefully. What is the difference between me and your teacher ()?

Teacher: Just now, I said something different. Let's see what I have in common with my teacher ().

Comment: Oh dear! Wittmann can observe (observe in detail), which is really eye-catching, but I have doubts: if what he said is great, I have different opinions or I have something to add.

Teacher: This is called communication in our class. But before communication, what else?

Teacher: Little friend, it seems that we all come to class with five senses and super brains. When we are ready, we will begin our class.

First, teacher-student communication, situational introduction

1, to learn about students' knowledge reserves for the Olympic Games.

Teacher: Olympiad, what do you want to say or ask when you see this topic? (Comment: You know so much! You are really good at asking questions. I also want to know what math problems there are in the Olympics! )

Teacher: We came to the hottest phenomenon of running men's Olympics, and even Olympic champion Sun Yang came to the scene. Hey, do you want to watch swimming or high jump first?

Second, independent investigation and competition on the field.

● Swimming

Running Man

1. The following table shows the swimming scores of Sun Yang, Blake and Li Chen.

After the information is provided, let the students ask their own questions according to the conditions as much as possible. If the students can't say it, the teacher will demonstrate it again.

Teacher: Do you have anything to say or ask after seeing this set of data?

Evaluation: Your findings are very valuable, and you can judge who is the champion, runner-up and third runner-up.

Evaluation: What a good question for children!

Teacher: Can you solve the problem just mentioned? Teacher: I especially want to ask a question. How many seconds is the difference between their grades? ) Sun Yang and Negro: 63. 19-26.20=36.99 (seconds)

Sun Yang and Jerry Lee: 84.9 1-26.20 = 58.9438+0 (seconds)

Black and Jerry Lee: 84.91-63.19 = 21.72 (seconds)

Transition: Through the calculation just now, we know the ones with poor grades. Can the students judge which picture was the sprint of the final according to the data provided in the table?

2. Two pictures

Students discuss in groups.

Teacher: What do you think? Why don't you choose the second one?

Evaluation: The teacher really likes you and is good at thinking and expressing. Not only can you think, but you can also express your reasoning process clearly and smoothly.

The first gold medal.

Transition Guide: As soon as the TV camera turns, let's take a look at the high jump shot of the running man.

Rules of high jump team competition: 5 people from each team take off in turn, and the heights are added up to 7 meters, which is regarded as success.

● High jump

After two rounds, the height of the red team was 0.07 meters behind that of the yellow team. The following are the results of the third and fourth rounds of the high jump of the two teams, such as

1, Jerry Lee jumped1.62m in the fifth round. How high does Zheng Kai have to jump to win?

The red team is 0.07 meters behind.

1.44-1.30 = 0. 14m, and the height of red team is 0.14m.

1.45- 1.40 = 0.05m, and the red team is 0.05m behind.

0. 14-0.05-0.07 = 0.02m, and the height of the red team is 0.02m..

1.62+0.02 = 1.64m( 1.65m)。

2. Arqie scored 1.60 in the last jump. How many meters is the total score difference between the two teams?

Method 1:1.64-1.60 = 0.04m.

Method 2:1.62-1.60 = 0.02m0.02+0.02 = 0.04m.

Third, consolidate practice and expand and extend.

Teacher: There is still so much math knowledge hidden in sports. Let's walk into the tall Olympic Games and have a look!

1. This is the scene when China's Guo Jun participated in the shooting final at the 20 12 London Olympic Games. Chinese and foreign people remember to take pictures of photographers from different angles. These four photos were taken by recalling where they stood.

2. Complete the problem of "Diving" on page 80 of the textbook.

Students finish independently, then discuss in groups and report collectively.

The following are the results of men's 60 meters and high jump in last year's county sports meeting.

Men's 60 m performance

Men's high jump performance

According to the information in the table, what math questions can you ask and answer?

4. After-school expansion

Choose a sport that interests you, record your achievements and compare with your friends. Collect and learn more about the Olympic Games!