Teaching Design of "Quotient is the Pen Division of Two Numbers" (1)
Teaching content: Unit 5, Volume I, Grade Four
Teaching goal: to make students better master the written calculation process and calculation method of two-digit quotient division.
Pay attention to the writing position of quotient.
Be able to use what you have learned to solve simple practical problems and feel the role of mathematics in life.
Develop the good habit of checking after calculation.
Teaching tool: puppet wall chart
Title board
Teaching process:
Before class: refer to the puppet wall chart.
Students, who is it? Answer. I think everyone must know its story very well! But today's puppets are different from the past. It needs your help to learn knowledge and become a real little boy. Are you willing to help it? Answer. That's great. Now let's take it into the classroom, shall we? Start class!
First, the introduction of scenarios, retrospective reproduction
Puppet wants to test your ability in order to ensure that his classmates can help him become a real boy. Do you have confidence?
Listen to the question: 1. Suppose that the quotient of a three-digit divided by 16 is a two-digit number. The student said, tell me your reasons. The student said, yes, please sit down.
2. Suppose that the quotient of three digits divided by 3 1 is two digits. Sheng said: Tell me your reasons. What if the first two digits are equal to 3 1? Answer. It's good. Please sit down.
3. If the quotient divided by 63 is a two-digit number, what can this three-digit number be? (The teacher writes on the corresponding blackboard) Answer. Why? Answer. Do you agree? Please sit down.
The students responded quickly, and that's right. It is up to you to be a real boy! And use it to review? Quotient double digits? Knowledge of written division of labor. (blackboard writing topic)
Second, stratified practice, strengthen and improve
1, what does the puppet learn first? Look at the title board: judge right or wrong.
Three vertical divisions (the first is that the remainder is greater than the divisor. The second way is that the numbers are not aligned in the vertical arrangement process. The third quotient is misspelled. )
Please think about the first question and make a judgment. What's the matter? How to modify it? Health said. Because of your correct judgment, the puppet has real eyes. (teacher painting)
Please think about the second question, life judgment. What's the matter? Sheng said: Please correct it. In view of your wonderful speech, the puppet has a real mouth! (teacher painting)
Please think and judge the last question. Do you agree?
Who can tell the puppet and his classmates what to pay attention to when calculating division with a pen? Student: The remainder should be less than the divisor. Align the numbers and be careful when trying to negotiate. The writing position of the quotient should be correct.
That's good. The puppet listens as hard as you do, so it has real ears. Are you happy to see that the puppet has changed like this with your help? what do you think? (Continue to help it)
2. Next, please look at the puppet's second learning task: writing (four ways)
Before the calculation, who makes a suggestion? (Student: Checking calculation. Seriously. Be careful. Wait. )
Are the students willing to adopt his suggestion? We asked the group leader of four to arrange a question for everyone. Refers to four students performing on the stage. And explain the written calculation process and trial-and-error method (two is enough). Exchange the rest of your life for correction and reward smiling faces.
It seems that the students' writing and computing skills are gradually improved, which makes the puppet have real arms. It is very grateful to you. What else do you want to do for it? Answer. Then we must use magic to solve the problem of the blue fairy. Please have a look.
(white crane 16, white swan 176. How many times are there white swans? ) The teacher reads. Please think,,,,,, Are you confident? Please answer independently. Theory pointing to life. (Note: The answer should be complete, and how to try to negotiate) Be correct all your life.
Because of your wonderful performance, the blue fairy gave the puppet legs by magic. The puppet's father, Grandpa Gaby, will bake it for his classmates to show his gratitude? Nutritional bread? But he met with difficulties, please see: (
Puppet dad took 700 yuan to buy flour for bread, bought 16 bags, and left 60 yuan. How much is each bag of flour? ) read raw. Please discuss the solution in groups of four, and then answer the questions. Point to the role of students, explain the idea of solving problems, try business processes and answer. Correct and reward the rest of your life.
With your efforts, the puppet also tasted it? Nutritional bread? Grow into a healthy body. He is very, very happy to be a boy with flesh and blood. He wants to invite his classmates? Wisdom island? Are you interested in playing the game of breaking through obstacles?
Third, independent testing, evaluation and improvement.
Please enter quickly? Great wisdom?
The first level, quickly write out how many digits the quotient is.
The second level, written calculation
The third level, the fourth level, from easy to difficult to solve practical problems.
Students independently answer questions, report and correct.
The game of breaking through the customs has passed, which fully proves that the puppet and his classmates are smart and brave children. Give yourself a hand! !
Fourth, summary, extracurricular extension
1, the little boy's learning journey ended with the help of his classmates.
2. Who wants to say something to him? Health said.
Who will summarize his study this time? Student: It is very important to try to write the quotient of division. You must be careful when trying to do business.
4. What inspired you to become a real boy through puppets?
To show his gratitude, the little boy wants to invite his classmates to his home, but he has to cross the river by boat. Think about it: our school has only 136 students in the fourth grade, and only one ship county can accept 1 1 student. How many times does it take to cross the river?
6, improve the pre-class quartering calculation.
The second part of the teaching design of "quotient is the pen division of two digits"
design concept
Computer teaching under the guidance of the new curriculum concept will change the single and boring phenomenon in traditional computer teaching. I will use this class. Create a scene, explore independently, consolidate and improve, and sum up the harvest? Start teaching. In teaching, I attach importance to combining with real life, creating situational learning division knowledge, diluting nouns such as rounding and taking Chinese and French, and replacing trying quotient divisor with images; Pay attention to the cultivation of estimation ability in the calculation process, and allow students to try quotient in different ways to break through the difficulty of trying quotient; Strengthen students' verbal ability and attach importance to the cultivation of number sense in order to improve students' direct quotient test level; Attach importance to the educational function of mathematics class and carry out moral education with life examples.
Textbook analysis
? Is the divisor a division of two digits? Belong to? Numbers and algebra? On the battlefield? Digital operation? The content of. Divider is the division of two digits, which is taught on the basis that students learn that multiple digits are divided by one digit, and divisor is one digit. Students have mastered the basic methods of pen division when learning pen division with divisor of single digits. Quotient is a two-digit number, where students can transfer the division process and try business law. In teaching, we should pay attention to the transfer of knowledge, let students experience the process of writing calculations and actively explore calculation methods. After the calculation, students can compare the division with a divisor of two digits with the division with a divisor of one digit, so as to further master the operation of written division.
Teaching objectives
1. Knowledge objective: To enable students to understand the calculation theory of pen division with divisor of two digits and quotient of two digits, to master the pen division method with divisor of two digits, and to correctly use this method for calculation.
2. Skill goal: let students experience the written calculation process of division of two-digit quotient, and cultivate students' migration ability, analogy ability and abstract generalization ability.
3. Emotional goal: to gain successful experience in the process of independent thinking and communication with others, to cultivate the initiative of learning and the consciousness of cooperation and communication, to have positive feelings for mathematics and to improve the ability to solve practical problems.
Teaching focus
Understand and master the division calculation method of dividing by two digits.
Teaching difficulties
Master the trial operation method flexibly.
training/teaching aid
courseware
Teaching process:
First, review foreshadowing, situational introduction
1. What can I put in the brackets below?
30? ()& lt 154 40? ()& lt202
60? ()& lt 186 70? ()& lt225
2. Written calculation.
768? 4= 367? 8= 128? 32=
Students independently tabulate and calculate, perform by name and give feedback collectively.
3. Divider is the calculation method of one-digit division.
Design intention: To awaken students' existing knowledge and experience by reviewing what they have learned before, and to learn knowledge actively and independently through positive transfer.
Step 4 import
Now environmental protection is advocated, and the school has set up an environmental protection team. Look, the students are cleaning the campus. (Example 6 Situation Diagram) Let's solve the problem together.
Design intention: Combining with the actual situation around students, and making full use of the scene diagram presented in the textbook to create teaching scenes, naturally infiltrating environmental education, and at the same time integrating computing into solving practical problems, so that computing teaching is no longer single and boring.
Second, explore new knowledge.
(i) Solution 6
There are 6 12 students in the school. Every 18 students form an environmental protection group. How many groups can you form?
1, let the students look at the questions.
2. How to make it and why use division?
We are in no hurry to calculate. Let's estimate how many groups we can form first.
4. Students calculate independently.
5. Name the chessboard and talk about the process of dividing two digits by three digits.
6. summary.
Design intention: Using the characteristics that mathematical knowledge can be transferred, through communication, discussion and research, students are guided to master and understand how to try quotient in writing, and the status of quotient and the method of division are established.
(2) Teaching Example 7
1, display: 940? 3 1
2. Let the students finish it independently, name the blackboard and give instructions.
3. Tell me what you think.
4. Breakthrough: What if the remainder is not quotient 1?
5. Why is the unit quotient of quotient 0?
6. If the dividend is 930, how many quotients are there?
(3) Summary
This is what we are going to learn today. Quotient is the pen division of two digits. Leading topic: pen division of two digits
(4) Summarize the calculation rules
1. What are the similarities and differences between division in which the divisor is two digits and division in which the divisor is one digit?
2. Tell me if quotient is the calculation method of dividing two digits.
Design intention: By comparing the order of division, the position of quotient, the size of remainder and the method of finding quotient, students can grasp the differences and connections between them in essence.
Third, practical application.
1, page 84 of the textbook? Do it. 1。
(First judge how many digits the quotient is, and then choose 1 to do it. )
2. Exercise 16, question 6.
3. Exercise 16, question 4.
Design intention: The design of exercises should be gradually improved from simple to deep, so that students can experience the sense of success in solving practical problems with mathematical knowledge, and comprehensively use the relationship between mathematical knowledge to achieve flexible learning and application.
Four, the whole class summary, infiltration of environmental education
Teacher: What new skills have you learned through today's study? Our beautiful living environment cannot be separated from everyone's joint efforts. Let's try to be a? Environmental guardian? Do your part for the beauty of the school, hometown and motherland!
Reflections on the teaching of "quotient is the division of two digits"
Through reflection on the teaching of this course, I have the following thoughts:
First, use textbooks boldly, flexibly and creatively.
In this class, because I am, too? Orderly? Improper use of teaching materials has led students to have a good way to try and adjust their business, but they have not shown and summarized it in time. From the teaching of this class, I realize that the textbook is just a teaching tool, shouldn't it? Use textbooks? , not? Textbooks? . In the process of using, we should combine the actual situation of students, use the teaching materials flexibly, and add and modify some contents appropriately. In the teaching of this class, I feel that the capacity of this class is relatively large. In fact, students can be divided into classes, so that they can fully try and sum up several ways to try business. In this way, we can consolidate several methods through practice, master methods, and choose the best method in consolidation.
Second, create an environment for students' development and build a platform to show themselves.
The development of students depends to a great extent on teachers. As much space as teachers give them, there is room for students' development. Therefore, teachers should create more environment for students, which is conducive to students' development, self-display and communication. Let them show themselves in such an environment and stage, absorb the essence of others and acquire knowledge. For example, in the teaching of this course, we can create an environment for students to explore by themselves. Through the communication between students and the guidance of teachers, students can sum up several ways to try business and participate in the whole process of forming new knowledge. Students acquire knowledge through their own inquiry, not teachers? Teaching? Come out, how can such knowledge be easily forgotten? So how important it is to create a good learning environment for students in class. I feel that I haven't completely let go of the students in this class. When the students had problems, I didn't realize what a good opportunity it was, but stood up in a hurry to give the students insufficient space. I should study hard and use my brain to serve students better in future teaching.
In view of the problem, I discuss with the teachers in our group, analyze the students' problems and carry out targeted exercises.
1, strengthen oral calculation.
The new curriculum standard puts forward that we should pay attention to verbal calculation, which shows that strengthening verbal calculation can not stay on the slogan, but should be implemented in every class at ordinary times. ? Sharpen the knife and cut the wood? Oral calculation is the basis of written calculation. It is necessary to spend 3 minutes doing several groups of oral arithmetic exercises every day. As long as you persist, I believe that students' verbal ability will be significantly improved.
2. Let students actively explore the calculation method.
On the one hand, it provides a rich realistic background for students' calculation and creates a space for independent exploration and cooperation. On the other hand, students already have the calculation basis of division with divisor of single digits, so they can explore it themselves, experience the formation process of the calculation method of pen-based division and deepen their understanding of arithmetic.
3. Appropriately increase the amount of training in calculation. Teachers should always pay attention to students' computer training.
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