2022年《数字编码的奥秘》教学设计与评析 .pdf

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1、数字编码的奥秘 教学设计与评析（Teaching design and analysis of mystery of digital coding）Teaching contents: Teaching on unit seventh version of the fifth grade second class maths. Teaching target: 1, through the student to each kind of code collection and the arrangement in the life, understood each kind of code,

2、understood the ID card code related knowledge and the general rule, obtains the preliminary digital coding method. 2, in the process of solving the problem, we should train students ability to abstract, generalize and collect information, process information, and try to solve the coding problems in

3、life by using the relevant laws. 3, the process of exploration, forming an active interest in mathematics learning activities, forming a sense of cooperative learning. Teaching emphasis: preliminary understanding of mathematical thinking of digital coding. Teaching difficulties: through observation,

4、 comparison, speculation, explore the general rules of digital coding. Teaching preparation: multimedia courseware, learning card, ID card number before class. 名师归纳总结 精品学习资料 - - - - - - - - - - - - - - -精心整理归纳 精选学习资料 - - - - - - - - - - - - - - - 第 1 页，共 13 页 - - - - - - - - - Teaching process: Firs

5、t, the creation of context, introduce interest Teacher: do you like watching TV, class? What do you like to watch? Student 1: I like the big windmill program of CCTV childrens channel most. Student 2: I love to see the animal world. Student 3: I like watching cartoons best. Teacher: the teacher brin

6、gs a program for everyone. Do you want to see it? Student: I want to see it. Teacher: watch the big screen, and play the lucky 52 lottery. T: Hey, whats this program? Student: This is Li Yongs lucky 52. Teacher: do you like this program? Student: I like it. Teacher: the teacher also love, I also adm

7、ire the host Li Yong, he is not only the host language is humorous, liberal and 名师归纳总结 精品学习资料 - - - - - - - - - - - - - - -精心整理归纳 精选学习资料 - - - - - - - - - - - - - - - 第 2 页，共 13 页 - - - - - - - - - dignified, more amazing is that he can according to the ID number quickly say lucky audiences personal

8、 information. Do you know why? It seems that there are many mysteries in the ID card number! comment: teachers make full use of the students loved the TV show the creation of context, to guide students by watching the show questioned, contains personal identity information ID number in the initial p

9、erception, arouse the students thirst for knowledge, for the next step to find and solve problems as well. Two, independent cooperation, explore new knowledge 1, the initial experience of the law of digital coding. (1) explore the general law of identity card coding Teacher: how do you form your ID

10、number? What information can you obtain from your ID card number? Below, please ask students to come up with identity cards collected information, first packet communication, careful observation, comparison, speculation, explore the general rules of identity card coding, and then report to each grou

11、p leader. Which group rules best? (2) the team leader presides over the group activities. (3) refer to 2 - 3 delegates, report and draw a conclusion. Student 1: I found my mothers identity card number 19720531 in the middle, these figures happen to be her date of birth. 名师归纳总结 精品学习资料 - - - - - - - -

12、 - - - - - - -精心整理归纳 精选学习资料 - - - - - - - - - - - - - - - 第 3 页，共 13 页 - - - - - - - - - Sheng 2: we found the same group of identity cards, some numbers are the same. 3: we also found that the second digit to the last group of singular men, women even said. T: youve found so much information about

13、your ID number. Its really something! What other questions do you have? (4) Division: identity card number in the end what are the mysteries? Lets see it together: (courseware shows ones ID number) 2. Reveal the coding rules of ID number. (1) a resident identity card is made up of 18 digits. The fir

14、st two numbers represent the provinces. For example, 42 represents Hubei, and 34 represents Anhui. (2) the two figures on the third, fourth place indicate the location and city of the residence. If 01 represents Wuhan, 02 represents Huangshi. (3) the two digits on the fifth, sixth digit indicate the

15、 county (District). (06, for example, Wuchang District of Wuhan, 07 for Castle Peak District) If the 1 - 6 bits are combined, the administrative division code is indicated, which is from which province, city, district and county. (4) the number from seventh to fourteenth indicates the birth 名师归纳总结 精

16、品学习资料 - - - - - - - - - - - - - - -精心整理归纳 精选学习资料 - - - - - - - - - - - - - - - 第 4 页，共 13 页 - - - - - - - - - date, month and day of a person, which is called the birth date code. Think about it: T: why not use 6 instead of 06 in June? Student: the month and date are made up of two digits, so they a

17、re represented by two digits. (5) what does the fifteenth to eighteenth stand for? Lets hear the introduction of the police uncle. Courseware introduces the origin of sequence code and check code: Year, month, day after the 3 number is the order code, by the Ministry of public security organs using

18、computer to every person born according to a certain order, if it is assigned to the singular row to the men, even assigned to women. The eighteenth bit is the check code, that is, personal information code, usually by the computer before the 17 figures are calculated by a formula, used to verify th

19、e validity of the identity card, and sometimes expressed in X. (6) Division: (showing your ID number) this is the teachers ID number. What personal information can you get from the teacher according to it? 3, talk about the role of identity cards. 名师归纳总结 精品学习资料 - - - - - - - - - - - - - - -精心整理归纳 精选

20、学习资料 - - - - - - - - - - - - - - - 第 5 页，共 13 页 - - - - - - - - - T: what part of your life do you need to use a resident ID card? Student 1: ID card to fly. Sheng 2: to the bank for deposit, withdrawals required ID card. Health 3: housing to use ID card. Student 4: go abroad to use ID card. comment

21、: in a relaxed, pleasant atmosphere of inquiry, students will learn to collect information and by the hands of the identity card number of the observation, comparison, speculation, feeling a 18 digit ID number contains personal details. In this aspect, students realize the joy of cooperation with ot

22、hers through cooperative learning, thus promoting the improvement and development of students individual and whole. Three, exercise feedback, show potential 1 Division: the role of ID card is really big! In fact, each citizen is born with an identity card number, which is compiled by the public secu

23、rity organ in accordance with the national standard of citizenship number. Guess what is your administrative code and birth date number in your ID number? What about sequential codes and check codes? How do you express these indefinite numbers? Give a summary of the presentation: available letters i

24、ndicate. 名师归纳总结 精品学习资料 - - - - - - - - - - - - - - -精心整理归纳 精选学习资料 - - - - - - - - - - - - - - - 第 6 页，共 13 页 - - - - - - - - - 2. Please take out your homework paper and write your ID number. Refer to 2 students report, division field input number, said: how do you weave? Why do you make that up? 3

25、games: lucky draw. Teacher: the students behaved so well that the teacher decided to reward everyone. Lets play a lucky draw game! Look at the rules of the game. Courseware demo. Game two awards: if the card out of the same number and ID number, can get lucky prize; the basic situation can say exact

26、ly according to the winning person out of the number to obtain wisdom award. The students call start or stop, and the computer will operate according to your instructions. Attention, please. The winning number is in your hands. Watch your ID number carefully to see who can be our lucky little audien

27、ce. comment: teachers carefully created to write your own ID number, and combining the students number arrangement sweepstakes, let the students hands-on, effectively explore the encoding method of the identity card number, expand students thinking, realize the optimization and extraction of digital

28、 encoding, cultivating students practical ability. Four, practice and expand 名师归纳总结 精品学习资料 - - - - - - - - - - - - - - -精心整理归纳 精选学习资料 - - - - - - - - - - - - - - - 第 7 页，共 13 页 - - - - - - - - - 1, Division: students, with our lives into the digital information age, digital coding has gradually been

29、 the focus of attention. In this class, we take the ID number as an example to discuss the mystery of digital coding. (Sticker topic: the mystery of digital coding) Where else have you seen examples of digital coding? For example, courseware play small data: Mathematics in life. 2 division: digital

30、coding can also serve our learning?! In order to facilitate management, the school decided to design a student number for each student. The teacher wants to invite everybody to be the small school status manager, for our class schoolmate makes the student number, you want? What kind of information d

31、o students need to reflect? Please open your textbook page 115, and example 3 will give you some enlightenment. 3, refers to 1 - 2 students report, with students answer courseware demonstration, design a student number scheme. Courseware demonstration: A. school code is prescribed by the administrat

32、ive department of education. According to the teachers investigation, the code of our school is 42. B. year of enrollment: 2002. C. class: for example, 03. 名师归纳总结 精品学习资料 - - - - - - - - - - - - - - -精心整理归纳 精选学习资料 - - - - - - - - - - - - - - - 第 8 页，共 13 页 - - - - - - - - - D. serial number: 01. E. g

33、ender: for example, 1 for boys, 2 for girls. 4, each team under the leadership of the group, to the group students number. 5, demo registration number of students (1 - 2), said: we will give the class number of students, in accordance with this method, can the school students for students? OK, lets

34、go to the deans office after class. comment the essence of knowledge is activity. To enable students to acquire knowledge, develop skills, it is very important to scientific and rational design of various forms of practice, writing, this practice conforms to the cognitive characteristics of students

35、, student writing through thinking, writing program, display on practice will learn to a climax, not only further deepen students understanding of digital encoding, and the development of students thinking, effectively stimulate the students interest in learning mathematics. Five, sum up, talk about

36、 feelings 1, division summary: students, happy 40 minutes to end, this lesson, what is your greatest achievement? The students talked about the feeling after class. Teacher: digital coding can concisely and accurately express 名师归纳总结 精品学习资料 - - - - - - - - - - - - - - -精心整理归纳 精选学习资料 - - - - - - - - -

37、 - - - - - - 第 9 页，共 13 页 - - - - - - - - - all kinds of information of things and provide many conveniences for our life. Therefore, the application of digital coding is more and more widespread, and now it has developed into high technology and national defense, If you are interested in these magi

38、cal coding, you may as well be a conscientious person, use your eyes to observe carefully, use your mind to think carefully, and believe that you will find more mathematical mysteries! 2 division: students, you know? In 2008, in Beijing, the capital of our country, there was a big event that attract

39、ed worldwide attention, that is, the 2008 Olympic Games, the success of the Olympic bid, so that every Chinese people are proud of it, let us feel the exciting moment again! Courseware. Teacher: what can we do with the knowledge we have learned today for the Olympic Games? Show your online collectio

40、n and read it by name. Collection inspiration In order to meet the unprecedented 2008 Olympic Games, especially extensive collection of Olympic athletes numbering scheme, welcome to the community give counsel. 2008 Organizing Committee of the Olympic Games 3 division: what should be reflected in the

41、 number of players? Students boldly imagine, talk about their coding ideas. After 名师归纳总结 精品学习资料 - - - - - - - - - - - - - - -精心整理归纳 精选学习资料 - - - - - - - - - - - - - - - 第 10 页，共 13 页 - - - - - - - - - class, students can also find relevant information by reading, surfing the Internet and other ways,

42、 so that your program is more scientific and reasonable. comment: this math class was over, but the students didnt stop thinking, teach left further thinking space for students in the end of the class, lead them into the life of the classroom, let the students from the new generation of mathematics

43、problems: the Olympic athletes so much, they come from all over the world, how scientific and reasonable for their number? This is not only the distillation and distillation of learning in this lesson, but also effectively raises the students awareness of problems and the consciousness of independen

44、t inquiry. Summary: in the classroom teaching, to implement the new curriculum standards advocated the effective way of learning: practice and self study and cooperation and communication. As a teacher, first of all, we should fully respect the subject status of students, and give full play to the s

45、tudents subjectivity, so that students mathematics learning is a lively, active and full of personality process. At the same time, teachers in this class delve into the teaching materials, creative use of teaching materials, and pay attention to creating a lively classroom atmosphere, so that studen

46、ts can always maintain a high degree of learning enthusiasm. There are three characteristics of this class that deserve your attention. 1, create a living situation, stimulate students interest in learning. 名师归纳总结 精品学习资料 - - - - - - - - - - - - - - -精心整理归纳 精选学习资料 - - - - - - - - - - - - - - - 第 11 页

47、，共 13 页 - - - - - - - - - The new curriculum philosophy emphasizes: mathematics should be based on the existing experience of students, and let the students experience and abstract the actual problems into mathematical models for interpretation and application. Mathematics should fully demonstrate i

48、ts connection with human life, especially in close proximity to childrens lives. The class began, the teacher with the students watch TV shows, which ID number, in order to stimulate students interest in learning, make the students feel the close relationship between mathematics and daily life, crea

49、te a vivid and interesting learning environment for students, effectively stimulate students interest in learning. 2, set up interesting games to build the climax of classroom teaching. When students have a preliminary understanding of digital coding, the next to write their ID numbers and draw game

50、s, allowing students to further understand the digital encoding. Such a simple and interesting scene attracted the students, they are enthusiastic, eager to participate actively, and the classroom atmosphere is higher than ever, Students have high interest and more active thinking. 3, leave room for