65438+23 00 10 month

Category:

Grade?Four

Teacher:

Wang xx

Lecture content:

Explore and discover (3) the law of multiplicative distribution

Teaching process:

First, find the problem:

1. Show the situation map and ask students to estimate how many tiles are stuck on the wall. 2. Verify the results in different ways. Ask students to use different methods to calculate, and lead to a discussion about why the results obtained by different methods are the same, and whether there are some rules.

Second, put forward the hypothesis, verify it with examples, and establish the model.

1. Put forward the hypothesis according to the law of the above problems. 2. Verify whether the proposed hypothesis is applicable to other data to observe the characteristics of the above formula. Give some data to verify in the group. You can use a calculator to verify it with some larger data. Communicate with the whole class, and use letters to indicate the distribution law.

Thirdly, the multiplication distribution law is used for simple calculation.

1, try to let students try to solve simple calculation problems in operation by multiplication and division. Then exchange and summarize simple calculation methods. 2. Practice:

Further try to solve the simple calculation problem in operation with multiplication and distribution law.

Fourth grade last semester math handout 2 lecture time:

September 23(rd)

Category:

Grade?Four

Teacher:

Wang xx

Lecture content:

Angle measurement (pages 25-27)

Teaching process:

First of all, realize the necessity of introducing protractor.

1, hands-on activities

Group work for four people: (1) Measure the size of ∠A and ∠B with ∠ 1

(2) They are all a little more than three times. Discuss what to do: measure from a smaller angle.

(3) Fold ∠ 1 to get ∠2, and measure ∠A and ∠B with ∠ 1.

2. Discussion and summary

Discussion: To measure how big an angle is, you can measure it with a specified angle. In order to unify the measurement units and facilitate communication, you specified an angle of 1 degree and used a protractor to measure the angle.

Second, know the protractor

Read 26 pages by yourself, think about the following questions, and then communicate in groups.

1, the unit for measuring angles.

2. The characteristics of protractor.

Third, measure the angle with a protractor.

1, try it yourself first: how to measure the size of ∠A and ∠B with a protractor.

2. Communicate measurement methods with classmates

3. Summarize the measurement method: emphasize the measurement method of "point-to-point coincidence and edge-to-edge coincidence".

4. Homework: Exercise 2, 3

Fourth grade last semester math handout 3 teacher:

xxx

Teaching content:

Addition and subtraction of decimals

First, review the addition and subtraction of integers.

Second, teach addition and subtraction of decimals.

Example 1. Uncle Li's water fee this month is 24.83 yuan, and natural gas fee is 5 1.6 yuan. How much does his family have to pay for utilities this month?

(1), pumping formula

(2), vertical column.

(The teacher explains the rules of addition)

The teacher projected the quadrangle and asked; "What are the characteristics of these quadrangles?"

(3) How much does it cost to bring a student?

25+50=75 (yuan)

Activity: Write several decimals (2 digits or 1 digit) greater than 10, select students with larger or smaller numbers and calculate their sum.

(4), summary, decimal and integer addition is the same, but the decimal point should be aligned.

Example 2. Datian Village sells 49.5 tons of wheat and Huangjiao Village sells 32.48 tons of wheat. How many kilograms of wheat does Datian Village sell more than Huangjiao Village?

(1) Draw a student's formula:

49.5—32.48=?

(2) Vertical column: 49.5

-32.48

-

17.02

Third, summary: the teacher talks about the rules (omitted)

Fourth, homework

leave out

Comments:

The teacher is persuasive, let the students use their brains together, let the students express their opinions and improve the classroom atmosphere.

But the teacher didn't say the right point.

In the form of games, let students do it themselves, improve their enthusiasm, give play to creative thinking, let students sum up knowledge points and deepen their understanding of knowledge.

Minutes of Mathematics Lecture in the Last Term of Grade Four On Tuesday, I listened to the lesson "Discovering the Law" by three grade four teachers, and gained a lot.

Teacher Chen Fei's class:

1. From the psychological point of view of students' participation in classroom teaching, the more activities closely related to students' lives, the more they can stimulate students' enthusiasm for participation and promote students' active and effective independent participation. Pay attention to design activities in teaching to arouse students' learning enthusiasm, such as breakfast collocation and clothes collocation. Students always participate in autonomous learning with full enthusiasm.

2. From life to life. What to eat for breakfast is introduced in the new lesson, which is close to students' real life. It is closely related to students, and students have something to say to stimulate their interest in participating in the classroom. Relaxing after class is a game that students are very familiar with. Think about several collocation methods from the game and solve this practical problem with the learned rules.

3. Teachers often use inspiring and encouraging language, and praise students many times in class, so that students learn happily.

Suggestion: When students come to the podium to match, they have a big picture of the teacher in their hands. At that time, I was wondering if it was possible to stick the big picture on the blackboard with a magnet, and then the students began to match it. I think I can see more clearly.

Teacher Jiang's class:

1, focusing on the development of students' cooperative inquiry ability. Students' cooperation requirements are clear, one person cooperates with one person to record, and students work together in a division of labor with high efficiency. In the process of cooperation, the law of collocation is initially perceived.

2. When showing the collocation method, ask: Which one do you think is good? Through comparison, the students found that there are two collocation rules: coat with trousers or trousers with coat. Because it doesn't look chaotic from the table, the students should have a sequence when they first perceive collocation.

3. Carefully design exercises to deepen and improve students' ability to solve problems. Through the two topics of' three people talking on the phone and three people sending greeting cards to each other', students can further deepen today's content, and the teacher also reminds students in time that although they have learned multiplication to solve such problems, they should consider it in combination with reality. This is also a mistake made by many students. Teachers remind students through different types of questions. It can be seen that teachers are thoughtful and thoughtful.

Suggestion: There are two small problems in the class: First, when Teacher Jiang talked about going to the Children's Palace from school, she said that Xiaoli wanted to buy a gift. I was listening to Xiaoli. Seeing the flowers written in the courseware, I feel that the relationship between people is more complicated. Second, when the students answered that the hat was changed into a square and the stick was changed into a puppet doll, the last sentence was wrong.

Teacher Xia's class:

1, the purpose of group cooperation is clear. Before the activity, the teacher first shows the requirements and asks the students to cooperate. Students are not ignorant in the discussion process, but purposefully, thinking about how to arrange in an orderly way in the activities.

2. In the process of students' transition from object graph to graph and then to column calculation, all links transition naturally. The teacher said it would take a long time and be very troublesome to make the physical map. Naturally, it was replaced by graphics. When the students chose to list the pictures, the teacher added: Seeing that the students have not been well for such a long time, the teacher was very anxious and naturally asked: Is there an easier way? Let the students think about the formula quickly. The teacher made a good preparation for the formula here. First, choose two kinds of drinks, and first choose three kinds of food. Because several kinds are the basis of multiplication, students can list formulas and understand their meanings.

Suggestion: When students work in groups of four, some students just talk at first, and there are no pictures. Later, the teacher went over to remind them that before the activity, the teacher should tell the students to take out the pictures in the white paper bag.

In addition, my research topic is cooperative learning strategies. In the class of three teachers, cooperative learning is arranged, and there are deskmates to discuss and exchange or four people to cooperate and exchange. These cooperations effectively promote the development of teaching activities and attach importance to the cultivation of students' cooperative inquiry ability.

The teaching process of mathematics handout 5 in the fourth grade last semester;

1, test import

Today, the teacher guessed a riddle for you: "A horse has three legs. It runs day and night and never gets tired. Tick-tock reminds you that time must be cherished. "

Question: (1) Guess what?

Children guess riddles, and the teacher shows the food with a clock.

Question: (2) What clock is there at home? What shape is it?

There are alarm clocks, watches, wall clocks and big clocks.

Question: (3) What is the function of the clock?

Summary: The clock keeps going. It is a tool to calculate time and tell people what time it is and what to do. It can help us form good living habits. It's our good friend. Children know the clock, they can get up on time and go to kindergarten on time. Teachers can attend classes on time, play games on time and let children eat on time. This clock is very useful.

Step 2 teach new lessons

The first link is a simple understanding of the clock face.

(The first link is in the form of observation and questioning)

Teacher: Do children want to be friends with Zhong? Let's learn about the clock. Please observe the contents on the clock face carefully.

Summary: two needles 12 number.

Question: (1) What's the difference between these two kinds of needles? (Different lengths)

Teacher: They all have their own names. The long one is called the minute hand and the short one is called the hour hand. We're looking at the numbers,

Question: (2) What is the number directly above? ( 12)

Question: (3) What is the number directly below? (6)

Question: (4) How are they arranged? (Turn clockwise once)

The second step is to perceive the running rules of the hour hand and the minute hand.

(The second link uses courseware to create story situations. )

(1) Today, let's watch a game. (Play the courseware) The rabbit and the tortoise are going to race on this circular track. Now they are at the starting line of the tallest tree. Guess who will win? (Children guess) Who will win? All right, the game is on. Let's get ready. Who won the game?

(2) Discussion: What is the secret of the race between the rabbit and the tortoise? The rabbit ran around and returned to the starting line. How far did the tortoise run? A tree is far away.

(3) (Play the courseware) Each tree is a number. Oh, they will change. The rabbit became a minute hand, and the tortoise became an hour hand. In other words, the minute hand runs once and returns to the starting point 12. The hour hand only runs one number, which is an hour.

The third link is to understand the whole point.

(The third link takes the form of practical activities)

(1) Teacher: What time do the numbers of minute hand and hour hand indicate? Don't worry, the teacher will tell you. When looking at a clock, look at the hour hand first, and then at the minute hand. At that time, when the pointer points to a number and the minute hand points to 12, it means "what time is it" and "one, two, three ... six o'clock" and the children dial the clock.

When you set the clock, you must set it clockwise. Clockwise direction is the direction from small to large numbers on the clock face.

(2) Ask individual children to practice.

Practice dialing 7, 8, 9, 10... 12.

(3) Use our body movements to represent 3 o'clock, 6 o'clock, 9 o'clock, 12 o'clock.

3. Integration of new courses

(1) Children should form good living habits and carry out various activities according to time. Let's take a look at the children's schedule (PPT): "Get up at 7 am, go to kindergarten at 8 am, have lunch at noon 1 1, have classes at 3 pm, finish school at 4 pm and go to bed at 9 pm". Let the children look at the daily schedule immediately, dial the time on this cardboard clock in the same way as before, and remember to talk about what you are doing at this time while dialing.

(2) Children's operation and teacher's guidance.

4. Game activities-"Wolf, what time is it?"

(1) Hello, who am I? Lao lang will play a game with you today. Do you dare? Tell the rules of the game: the teacher plays the wolf and invites the children to be lambs. The old wolf asked in front, "lamb, what time is it?" The old wolf holds the clock in his hands, then dials the time, and the lambs say the time together. If the lamb admits his mistake, he will be eaten by the old wolf.

(2) Ask the children to play the old wolf once.

5. Class summary

Teacher: Today, children, we learned to know the clock, what is the minute hand, what is the hour hand and the hour. Clever uncles and aunts designed and manufactured various clocks (alarm clock, quartz clock, musical clock, craft clock, watch, pocket watch), and displayed the pictures on the courseware, which brought convenience to human life and beautified people's life. Children, study hard now and invent more and more beautiful clocks when you grow up, ok?

(With the music of "Time is Like a Small Carriage" coming out of the classroom)