1, let students know and learn to draw horizontal composite bar charts on the basis of understanding horizontal composite bar charts.

2, can put forward and answer simple questions according to the statistical chart, can find information and simple data analysis.

3. Through the statistics and analysis of relevant cases in real life, stimulate students' interest in learning and cultivate students' sense of cooperation and practical ability.

Emphasis and difficulty in teaching

Teaching emphasis: drawing horizontal composite bar graph; Educate students to love nature and protect the environment.

Teaching difficulties: finding, asking questions and solving problems according to statistical charts.

teaching process

First of all, compare legends and introduce new lessons.

Students, the teacher collected the statistics of 1997 and 1999 China nature reserves as follows:

1. Courseware demonstration statistics: statistics of the number of national nature reserves 1997, 1999.

National, provincial, municipal and county levels.

1997 124 392 84 326

1999 155 402 138 449

Can you draw a bar chart according to the statistics? Life says yes. The teacher also drew two pictures. Look:

2. The courseware shows the statistical chart.

Question: According to a statistical table, the teacher drew two bar graphs. Please carefully observe the similarities and differences between the two bar charts. (mainly the changes of ordinate and abscissa)

Teacher: The histogram in Figure 2 is the horizontal composite histogram we are going to learn today.

Title: Horizontal composite bar chart.

Teacher: Just now, by comparing the two kinds of composite statistical charts, we know that the horizontal composite statistical chart and the vertical composite statistical chart are only different in form, and other aspects are the same. If there are not many kinds of data, but each kind of data is relatively large, it is more convenient to express it with horizontal statistical charts.

Second, independent exploration, cooperation and exchanges.

Research example 2.

1, Introduction to Conversation: Students, with the continuous improvement of people's living standards, many people have bought cars, vans and so on. At home. In order to bring convenience to these vehicles, we will build many parking lots, so that different types of vehicles can park in different locations in the parking lot. And count the number of various vehicles in the parking lot, and then collect useful information from the statistical data. How can we better analyze these data? This requires the use of composite bar charts. Let's sort out and analyze the collected information together.

2. Statistics of Example 2 show that:

Courseware demonstration: The parking statistics of parking lots A and B are as follows.

Type and quantity of parking lots, cars, trucks, buses and trucks

A 28 12 6 4

B 24 10 7 3

Question: What information can you get from this statistical table?

After the students answered, the teacher summarized.

Teacher: This is a double-entry statistical table. According to the statistics, there are 28 and 24 parking lots A and B, 12 and 10 vans, 6 buses and 7 buses, 4 trucks and 3 trucks respectively.

(2) Teacher's guidance: Through this composite statistical table (the courseware shows the vertical statistical chart), we can draw the horizontal composite statistical chart compared before.

(3) Teacher: We have learned how to draw a horizontal single bar chart, and we also learned how to draw a vertical composite bar chart last class. Please complete the horizontal composite bar chart in Example 2 according to what you have learned.

Students independently supplement the complete horizontal composite bar chart according to the statistical table.

Teacher: The teacher also made a statistical chart according to the statistical table. Let's have a look.

Courseware display: bar chart.

Teacher: Please compare the statistical chart drawn by yourself with that drawn by the teacher and tell us what we should pay attention to when drawing statistical charts.

Teacher induction and blackboard writing:

Strip thickness should be uniform; The number of cars in parking lots A and B should be different; Write down the quantity; Write the title of the statistical chart, and each item should be written clearly and completely.

⑤ Let several students show and exchange their own transverse composite statistical charts in the class, and the teachers and students will evaluate them at the same time.

3. Discuss and communicate: According to this statistical chart, what math questions can you ask? What else can you find?

Teacher's summary: Through the comparative analysis of the two parking lots, we can find that the two parking lots have a common feature, that is, there are many cars parked, from which we can preliminarily conclude that other parking lots also have the most cars.

Third, practical application, consolidation and deepening.

1. Guidance completed 106 page? Do it.

Courseware demonstration: Zone A and Zone B, the greening in Zone A is good, and the trees and grasslands in Zone B are destroyed. The precipitation of the two places in recent years is as follows:

(1), let students independently complete the horizontal composite bar chart.

(2), 1985, what are the precipitation in A and B respectively? What about 2000?

(3) According to this statistical chart, what information did you find? Any suggestions? According to the students' answers, show: greening, planting trees, more precipitation, planting trees, forming a virtuous circle. There will be less serious destruction of precipitation, affecting the ecological balance. Teacher's summary: According to the information in the picture, if greening is done well, there will be more trees, which will bring more precipitation, and more trees will flourish, forming a virtuous circle. To this end, we should actively carry out greening activities and strive to green and protect our surrounding environment. At the same time, we should strive to be small environmental guards, vigorously publicize environmental protection knowledge, actively participate in environmental protection activities, and dare to stop environmental damage. Environmental protection is everyone's responsibility.

2. Guide to completing the exercise:

Statistics on the number of students who like sports in Grade Three of Bashi Special School

Statistics on the number of third-year students who like this project in Bashi Special School

What information can I get?

3. Please enjoy:

Know that there are other forms of statistical charts.

Fourth, the whole class summarizes, students ask questions and evaluate themselves.

1, let the students tell what they have gained from this lesson. Is there a problem?

2. Teacher: Class is over. The teacher wants to ask if you are satisfied with your study in this class. And want to do it to sort out, count and analyze (show the statistical chart). Statistics are divided into satisfaction, basic satisfaction and dissatisfaction.

Teachers automatically generate horizontal composite bar charts according to statistical data.

Teachers and students analyze the collected information together. Dissolve the class