Teaching plan of "24-hour timing method" in the second volume of third grade mathematics published by People's Education Press.

Teaching objectives of "24-hour timing method" teaching plan (1)

Knowledge and skills:

Understand the 24-hour timing method through specific life scenes, and correctly represent a certain time of the day with the 24-hour timing method.

Process and method:

Let the students discover and summarize the methods of expressing time and the law of mutual transformation in the ordinary time-keeping method and the 24-hour time-keeping method through observation, comparison and other activities, and can correctly carry out mutual transformation.

Emotional attitudes and values:

In the process of exploration, students can experience the application of 24-hour timing method in life, help students to establish the concept of time, arrange the schedule reasonably, form a good habit of cherishing time, and cultivate students' noble sentiment of loving life.

Emphasis and difficulty in teaching

Teaching emphasis: let students understand the 24-hour timing method and use it to correctly express the moments in life. Know the meaning of the time represented by the 24-hour timing method.

Teaching difficulties: master the characteristics of two different timing methods, find the law of time conversion between ordinary timing method and 24-hour timing method, and correctly convert these two timing methods.

teaching tool

multimedia courseware

teaching process

1. View import

1, wonderful lead: TV program preview (CCTV-2)

Please watch carefully: When will the CCTV program Exchange Space start? When does the "Dialogue" program start?

(2) Can18: 30 and 2 1: 50 be found on our clock face? This is a method of timing. Now, let's learn the 24-hour timing method. (blackboard writing topic)

2. Contact life and explore independently.

(1) 1 day =24 hours.

In a day (that is, a day), how many times has the hour hand on the clock face just gone?

Let the students close their eyes and think about it first.

Now let's see how the hands on the clock face go. (Teacher demonstrates). Students, on New Year's Eve, when the New Year's bell rings 12, the new year begins. At this time, both the hour hand and the minute hand on the clock face point to the number 12, which is 12 at night. Next is 65438+ 0 am and 2 am? (Talking while dialing) Some people get up after 6 o'clock in the morning? At 8 o'clock in the morning, it is time for us to start our first class. We should have a big lunch until noon 12. 65438+ 0 pm, 2 pm? 8 pm, 9 pm? Until the evening 12, how many times did the hour hand on the clock face walk a day? How many hours is a * *? With the students' answers, the teacher wrote on the blackboard: 1 day =24 o'clock.

Teacher: In other words, it will appear twice every time. For example, it may be in 10.

(2) Know the beginning of the day? At 0 o'clock.

Teacher: Do you know when the day begins? Let the students express their opinions freely, and the teacher will not answer first.

Teacher: When does the day begin? Let's watch a video together! This is the scene where everyone welcomes the beginning of the first day of the new year at the Spring Festival Evening. Question: The first day of the New Year has already begun. What time is it on the clock? When is 12? (evening 12)

Teacher: Evening 12 means that the day is over and a new day has begun. As the beginning of a new day, we usually say 12 at night is 0: 00 in the morning. What do we usually do at 0 am? Do you know when the day begins now? Let's talk about it together (0 am)

(3) Feel the progress of the day.

Question: So how long is a day? Let's feel the course of the day! Teamwork sets the clock and says:

It's 0 o'clock in the morning, and we started a new day in our sleep. In the ticking of the clock, time passed unconsciously and the sky gradually lit up.

(The clock stops at 4 am) Question: What time is it? (4 am) What are we doing?

(The clock stops at 6 a.m.) Question: It's dawn and the sun has risen. What time is it now? We get up (6 am) (the clock stops at 8 am) and ask: What time is it and what are we doing? At 8 o'clock in the morning, we began to study in class.

The clock stops at noon 12. Problem: Time flies. What time is it now? (12 noon) It's time for lunch.

Classroom communication

Answer the question: (1) It took () hours from 0 to noon 12. (2) From 12 noon to zero, another () hours passed. (3) A day is () hours.

(4) Dynamic observation and intuitive understanding

There are red and blue circles on the clock face. What would it be like if we spread out the past time of the day on the clock face?

(5) Change the timing method to deepen the impression.

Question 1: What is the 24-hour clock at 9: 00 am? When is the 5: 00 p.m. 24-hour clock?

How about 9 pm? Tell me how you know.

Question 2: What is the relationship between the top and bottom lines in the picture? What did you find?

(6) The time of 24-hour timekeeping method is converted into the time expressed by ordinary timekeeping method.

Teacher: (The courseware shows the schedule of the program preview? Can you tell me when each program will start? It's better to make it clear whether it's morning, afternoon or evening.

Teacher: Actually, the time here is recorded in two different ways (blackboard writing? Timing method? )

Teacher: Comparing these times, what do you find the same and different?

Teacher: Sometimes you can't tell whether it's morning, afternoon or evening, so how do you know what time it is?

Teacher: Since when should we reduce 12?

Teacher: The first two times are called 12 hour, and the next five times are called 24 hours.

3. A preliminary understanding of time and time.

(1) Kangfu and Xiaojing are going to borrow books from the library (showing pictures of the opening hours of the library. Who knows when the library opens and closes? So what are the opening hours of the library in a day? Students report when they are independent.

(2) The following is the TV program schedule (part).

Please answer:

1) How long did it take from the program Golden Childhood to the program Children's English?

Attached answer: 8:40-8: 10=30 (minutes)

2) On Saturday, Xiaoming gets up at 7: 50. He is going to watch The Golden Age. How much time is left at most?

Attached answer: 8: 10-7:50=20 (points)

3) Xiao Ming must do three things after getting up: brush his teeth and wash his face (5 points), make breakfast (10 points) and listen to the morning news (10 points). Can Xiaoming watch the golden age on time? Can you think of a way for Xiaoming?

Attached answer: 5+ 10+ 10=25 (points) can't. You can brush your teeth, wash your face or make breakfast when listening to the morning news.

4. The time expressed by ordinary timing method is converted into the time of 24-hour timing method.

Teacher: (The courseware shows the schedule of work and rest? Can you change it to a 24-hour timer for me?

Teacher: Where have you seen the 24-hour timer?

Teacher: Which one do you like?

Teacher: 1) Name the following time in 24-hour clock. 7 am 65438+ 0 pm 8 pm

2) How many hours are there from 6 am to 4 pm?

Ps: There are 10 hours from 6 am to 4 pm.

3) Dad gets off the train at night 1 1 and takes the night bus at 2 1 1. Do you have a car?

There is a bus, because the last bus is 4:40.

5. Classroom exercises (courseware demonstration)

(1) Miss Li arrives at school at 7 am and finishes school at 6 pm. She stays at school for () hours every day. (2) The broadcast time of local TV stations is as follows: the first time: 6: 00-10: 00; Second time:11:00-15: 00; Third time: 19: 00-0.

(3) Give a sentence

18 is 8 pm ()

A new day begins at 6 am. ( )

6. Expansion and upgrade (courseware display)

1) mom goes to work at 8 o'clock every day and gets off work on 16. How long does she work a day?

Attached answer: 16 hours -8 hours =8 hours.

2) A football match, 45 points in the first half, 45 points in the second half and 20 points at noon, if the game starts from 19.

Game, when will the game end?

Attached answers: 45+45+20 =110 =1:50, 19: 00+1: 50 =20: 50.

Summary after class

One question:

What did you learn in this class?

B. Teacher and student summary

I learned to use the 24-hour system to represent the time of day, and I can calculate how much time has passed.

Write on the blackboard.

24-hour timing method

1 day =24 hours

Ordinary time method 7 pm

24-hour clock 19: 00

Teaching plan of "24-hour timing method" (2) Teaching objectives

1, knowledge and skills target:

(1) If you learn the 24-hour clock, you will use the 24-hour clock to express the time.

(2) Require students to transfer knowledge and cultivate students' ability to think and find problems.

2, process and method objectives:

(1) Understand the 24-hour timing method by observing and combining familiar scenes in daily life.

(2) Learn simple transformation through student communication and teacher guidance.

3. Emotions, attitudes and values:

Use meaningful examples to make students realize the preciousness of time and cultivate students' awareness of cherishing time.

Emphasis and difficulty in teaching

When you learn the 24-hour timekeeping method, you will use the 24-hour timekeeping method to represent time.

Students are required to transfer knowledge and cultivate the ability to think and find problems.

teaching tool

courseware

teaching process

First, pre-school guidance, introducing new courses.

1, the teacher took out the clock model for teacher-student interaction, and the teacher set aside time for students to look at the clock face and answer, and the teacher recorded.

Teacher: Today the teacher brought a clock partner to study with us. Look at the clock face.

Teacher: We go to school at this time in the morning. What time is it now?

Health: Seven o'clock in the morning.

Teacher: We finish school at this time in the morning. What time is it now?

Health: 165438+ 0: 50 am.

Teacher: We have classes in the afternoon in more than two hours. What time does the class start in the afternoon?

Health: 65438+ 0: 40 pm.

Teacher: Are we going to watch "News Network" on CCTV 1 at this time in the evening?

Health: 7 pm

2. Teacher: Just now, we set aside four moments a day. How quickly a day passes. Everyone should cherish every day! Show me the ancient poem "Two Poems of Bailudong". It's already spring, and an inch of time is worth an inch of gold. It is not Taoism that mocks, but the teachings of Duke Zhou are devoted to the study of Confucius.

Teacher: The times written on the blackboard are morning, afternoon and evening. This is the common timing method we studied before, also called 12 hour timing method.

(blackboard writing: 12 hour timing method)

Teacher: Do you know how many hours there are in a day?

Health: 24 hours.

Teacher: So today we are going to learn a new method of timing? 24-hour timing method.

(blackboard writing: 24-hour timing method)

Comments: According to the students' life experience and existing knowledge, the teacher created a review of the ordinary 12-hour timing method, which fully made students feel that mathematics comes from life, awakened the knowledge system in their minds, contacted the new knowledge 24-hour timing method, and stimulated students' desire to explore. It is an important link to help students successfully complete the 24-hour timing study.

Second, self-study teaching materials, preliminary understanding.

1, Teacher: Everyone has mastered the previous knowledge very well. Let's take the method of autonomous learning to study. Are you confident to learn well? All right! Look at self-study thinking first.

2, show self-study thinking:

(1) How many times does the hour hand on the clock go a day? * * * How many hours?

② What is the 24-hour timing method? How to understand it?

Can you use the 24-hour clock? Please complete the self-study test.

Learning and practice:

12 hour timing method 24 hour timing method

7 am ()

0: 50 am ()

65438+ 0: 40 pm ()

Seven o'clock in the evening

3. Students think about the contents of 83 pages of the self-study textbook according to self-study.

4. Cooperative learning.

Teacher: Let's discuss these three questions with the students in the group and see who speaks well.

5. concentrate on communication.

According to the students' speeches and the clock model, the teacher explained the above three questions clearly and wrote them on the blackboard in time.

Comments: Students can truly understand the knowledge, ideas and methods of mathematics only by participating in practical mathematics activities and gaining rich direct experience. We must believe in students' learning potential and respect their independent personality in teaching. Therefore, in this link, through students' autonomous learning and cooperative learning, every student can get exercise in the process of self-study and stick to it. Learn first and then teach? Let some students learn 24-hour timekeeping by themselves first, and then drive all students to show their ability and intelligence, thus reducing the need for students with learning difficulties and promoting their knowledge growth. Teachers also make full use of blackboard writing to let students intuitively understand the conversion method between 24-hour timing method and 12-hour timing method.

Third, discuss problems and strengthen cognition.

1, query, discuss and comment.

Teacher: Are there any questions you don't understand in the process of self-study? Ask the students to bring it up, and then organize other students to think and solve it. )

Teacher: The teacher also has two questions.

① When 7: 00 pm means 19 before 24: 00 clock, how did you come up with it? (Ask the students to say 7: 00 p.m., because it's past 12 in the morning and 7: 00 in the afternoon, so add 7: 00 to 19 in a 24-hour system. )

② 12 How to express the midnight 24-hour timing method? (After two hours in the middle of the night 12 hours, it means 24: 00 according to the 24-hour system. 24: 00 is the end of a day and the beginning of a new day, also called 0: 00. ))

2. The teacher's overall evaluation.

Teacher: (1) Generally, there is a time word in front of ordinary timing methods. Such as: morning, morning, afternoon, evening, etc.

(2) When using the 24-hour timing method, say when it has been several hours since 0: 00. After 12: 00, the time difference is 12 hours.

Comments: Further guide and explore the general rules of 24-hour timing, and help students understand and discover the connection and difference between ordinary timing and 24-hour timing. Let the students who have studied teach the students who have not studied, and finally make a general comment, highlight the key points and break through the difficulties.

Fourth, comprehensive training, consolidation and improvement.

1, according to the textbook page 83.

2. Thinking and writing.

What kind of timing method is used for the following moments? Change the timing mode of 12 hours to 24 hours, and change the timing mode of 12 hours to 24 hours.

6 a.m.

19:00 ( )

5 pm ()

14 hour ()

10 hour ()

8:00 ( )

65438+ 0 am ()

12 midnight ()

Eight o'clock in the evening

Fifth, evaluation feedback, extracurricular extension.

1, class summary. What did you learn from today's study? What did you get?

2. Solve problems in life.

Is there a problem with the following business hours cards? Why?

Business?Hours?

8:009:00