Teaching objectives:

1. Let students know the broken line statistical chart on the basis of the bar statistical chart, and further understand the role of statistics in real life and the close relationship between mathematics and real life.

2. Make students understand the characteristics of the broken-line statistical chart, read the broken-line statistical chart, and make reasonable analysis according to the data, so as to cultivate students' cooperative consciousness and practical ability.

3. Through the investigation of relevant cases in real life, stimulate students' interest in learning and cultivate students' good learning quality and scientific attitude by careful observation.

Preparation of teaching AIDS: unfinished statistical charts and teaching courseware.

Teaching process: 1. Scene introduction.

Teacher: Where do students like to play? Have you ever been to the Science Palace? The Science Palace holds a science and technology exhibition every spring. The following is the number of primary and secondary school students who visited the science and technology exhibition in our city from 1998 to 2003. Can you make a histogram according to the relevant data? Let's finish this statistical chart together!

Second, independent exploration, cooperation and exchange.

1. Complete the bar chart.

According to the data provided by the teacher, the students independently complete the histogram of the number of primary and secondary school students visiting the science and technology exhibition, and talk about what information they can find according to this histogram.

Teacher: Actually, statistical charts can also be drawn like this (the courseware demonstrates the drawing process of broken-line statistical charts). Please pay attention to how this statistical chart is completed.

Teacher: Please compare these two statistical charts in your hand and see if there are any similarities and differences between them. Please think about it, and then exchange your thoughts with other students in the group.

2. The whole class exchanges and reports.

The courseware displays bar charts and line charts.

Class report: communicate the similarities and differences between bar chart and line chart through group cooperation, summarize the characteristics of line chart and give it a name to enrich students' imagination.

Observe the dotted statistical chart.

Teacher: What other information can be found from the broken line statistical chart? How do you feel?

Guide students to observe the changes in the number of people participating in scientific and technological exhibitions and talk about their feelings, cultivate students' interest in caring about things around them, and guide students to actively participate in social practice activities.

Third, consolidate the application

1. Finish the exercise 19, page 1 12, page 1 question.

2. supplementary exercises.

List of Dust Weather in China in Recent Years

Please complete the following broken line statistical chart according to the above statistical table.

(1) What information did you get from the statistical chart?

(2) Can you predict the sandstorm weather next year according to the broken line statistical chart?

3. Practical activities.

(1) Please investigate the pulse rate per minute of yourself and people of different ages around you.

(2) According to the collected data, complete the broken line statistical chart (send the blank statistical chart to the students in advance).

(3) According to the statistical chart, what information did you find?

(4) According to the results of your own investigation, consult relevant information and write a scientific essay on pulse condition.

Fourth, summary.

What did you gain and feel from this lesson?