Teaching content analysis
1. Let students know that 1 can represent multiple units in activities such as looking at pictures and drawing pictures. The textbook does not tell students directly that the 1 grid in the bar graph can not only represent 1 unit, but also multiple units. Instead, there are many bar charts with 1 grid representing multiple units, so that students can notice that 1 grid in the chart represents multiple units when they look at the picture and speak.
2. Strengthen the comparison, analysis and judgment by using the data in the bar chart. Through the interesting micro-lesson video, we can compare the mathematical information in the statistical diagram and dig out a lot of information. If all the information is mined from statistical charts, students can know more facts and have stronger interest in learning.
Analysis of teaching objects:
The students got to know the bar graph in the first class. At that time, the 1 cell in the chart only represented 1 unit, for example, 1 cell represents 1 person, 1, 1 piece. This unit continues to teach bar charts. The 1 grid in the chart represents multiple companies, for example, 1 grid represents 2 votes and 5 votes. Through the teaching of these contents, students can further understand the data presented by statistical charts, and can also express the data they have obtained in statistical activities in a straight line more conveniently.
Teaching objectives
1. Experience the process of using numbers and bars to represent quantities in different ways, experience the advantages of intuitive and easy comparison when bars represent quantities, and realize the necessity of learning bar statistical charts.
2. Through reading and drawing activities, we can understand the bar statistical chart with 1 grid to represent multiple units, understand the structural characteristics of the bar statistical chart and the method of expressing quantity, make a simple analysis of the data, and accurately draw bars with appropriate length according to requirements.
3. Through observation and communication, we can further enrich our understanding of bar graphs. Understanding bar charts is helpful for comparing data, analyzing problems and statistics can help people make correct decisions.
Emphasis and difficulty in teaching
Teaching emphasis: Understand the bar graph of multiple units represented by 1 grid, and compare, analyze and judge the data.
Teaching difficulties: accurately draw a strip with appropriate length according to the requirements, and draw a complete statistical map of the strip.
Teaching preparation
Micro-lesson video: multimedia and courseware to understand bar charts (middle) and bar charts (bottom).
teaching process
First, play the onion micro-lesson video "Understanding Strip Statistics" (middle) to review old knowledge and introduce new lessons to stimulate students' interest in learning.
1.
A bar chart consists of a title, a horizontal axis, a vertical axis, a grid and a straight bar.
2. The teacher plays the video
Teacher: We won the class championship in the competition yesterday, and we learned to record our grades with bar charts. Today is the second stage of the competition. The second event of Eating King is "Eating Onions". What problems did the dog egg encounter? Let's take a look!
3. Students watch the video and say the topic: Bar chart. The teacher writes on the blackboard.
Second, play videos to guide students to acquire new knowledge.
1, the teacher continues to play the video, asking: How to record large numbers with bar charts?
2. Students discuss, communicate and answer questions in groups.
Summary: With each grid representing 2 units, students' competition results can be recorded. Careful children find that the results of these games are even numbers, and you can find the corresponding position on the vertical axis.
3. Continue to play the video. The teacher asked: how to record the results without 9 on the vertical axis?
(1) Students complete the contact in the video and exchange answers.
(2) Teachers guide students to understand that half a grid can represent an onion.
(3) Students complete the exercises in the micro-lesson video and learn to read the bar chart.
Teacher's summary: In this video, we learned that two quantities can be expressed in various units to save the space of bar graph. You can draw a half box when you meet the singular number.
4. Play "Understanding Bar Statistics" (Part II) to understand and learn to represent multiple units with one grid.
(1) Make a suitable bar chart for the statistical table.
(2) Guide students to learn to use a grid to represent the quantity of five units and make a simple calculation.
(3) Guide students to master a unit that represents multiple quantities, and make appropriate statistical charts for statistical tables.
5. Guide students to complete the "try it" in the textbook. Teacher: Just now our classmates introduced me so much knowledge. Now, let's try to finish the following exercise by ourselves. (1) Teachers organize students to finish independently.
(2) The completion of students' group communication statistics chart. Focus on checking whether the height of the bar graph is correct and whether the data is marked on the straight bar.
(3) Ask the group representative to talk about what you have learned from the statistical chart.
(4) Talk about the advantages of bar graph. Teacher's summary: The characteristic of bar chart statistics is that it can make people see the size of each data at a glance, and it is easy to compare the differences between the data and clearly display the numbers.
Third, consolidate practice and internalize improvement.
1. Finish the first question "Think and do" after class.
(1) Find out the differences of statistical graphs in the problem.
(2) Use a ruler to measure whether the height of the straight bar is correct.
2. Complete the second question "Think about it and do it".
3. Complete the third question "Think about it and do it".
(1) Students complete the statistical chart by themselves.
(2) Check each other's drawing in the group.
(3) Tell me how you feel about the picture.
Fourth, understand the column chart and review the extension.
1, the teacher plays the courseware to guide the students to understand the three-dimensional cylindrical statistical chart. In life, we often see such statistical charts. What is the difference? Can you get some mathematical information from the picture? What questions can I ask?
2. review.
Question: Happy times are always short, and this class is coming to an end. What did you gain from today's class?
Summary: Students learn to complete statistical tables and histograms by collecting, sorting and analyzing data, and understand that using one unit to represent two quantities can save the space of histograms. You can draw a half-grid and a half-grid when you encounter a singular number, understand and learn to represent multiple units with one grid, and also know the advantages of bar charts. The characteristic of bar graph is that it can make people see the size of each data at a glance, easily compare the differences between the data and clearly display the numbers.
Verb (abbreviation for verb) homework after class
Teacher: Students, mathematics comes from life, and it is closely related to our life. For today's homework, please do a small survey after class, go to the supermarket to see which kind of fruit sells best, and make statistics and bar charts.
blackboard-writing design
bar chart
? The length of the bar indicates the quantity.
Advantages: clear at a glance, convenient for comparison.