First, create situations and learn new lessons.

1. Introduction

Observe before class, play in groups, and learn wisdom for the discipline of the second and third groups. )

Teacher: Today, Grandpa Wisdom will take the children to experience the four seasons in a time spaceship. Do the children want to go?

Health: Yes!

Teacher: Do you know which four seasons are in a year?

Health: spring, summer, autumn and winter.

Sow hope in spring.

(1) Teacher: Our first stop is spring. The courseware shows the scenery of spring. Spring has come and the fields are green. March 12 is Arbor Day every year. On this day, people must plant many trees to green our environment. Now Mr. Chen will take the children of Class 1 (2) to plant trees, ok?

Health: Good!

The teacher opens the paper on the blackboard. There are two rows of trees. )

Teacher: Let's count how many trees we want to plant in the first row.

Health: 8 trees.

Teacher: What about the second row?

Health: 6 trees.

(2) Teacher: What math questions can you ask after seeing this picture? Please turn your head quickly and raise your hand to answer Mr. Chen's question.

Health: How many trees are there? How many trees are there below? How many trees are there?

Teacher: You are really something! Is there a problem?

Health: How many trees are there on the right of the first tree?

Teacher: You are great! But is your first tree in the first row or the second row? (The teacher points to the tree and asks)

Health: The first row. (Teachers reward students 1 and 2 small red flowers)

Teacher: Oh, how many trees are there to the right of the first tree in the first row?

Health (all): 7 trees.

Teacher: Is there a problem?

Health: How many trees are there? How many trees are missing below?

Teacher: Your answer is good, but it is incomplete. Who can help him?

Health: How many trees are there above than below? How many trees are there below than above?

Teacher: You are all great. You asked a lot of questions. How many trees are there in that * * *? Who will make the recipe?

Health (all): 8+6= 14. (Teacher writes on the blackboard 8+6)

Teacher: Oh, you all know his score, but Mr. Chen doesn't know how to calculate it. I want you to help me solve this problem, okay?

(3) Teacher: OK, now let the children take out their sticks and swing. What is 8+6? How to calculate it? How many ways do you have? When music starts, you should stop and sit up straight. Ready, go! (The teacher instructed some students to put sticks)

(4) Teacher: Tell your deskmate what you think. (Music starts to signal students to sit up straight)

Teacher: Now, please tell the children, what methods did you use?

Health: 8+6= 14. Count eight trees here and six trees there.

Health: I counted them.

Teacher: Great! If you speak louder next time, I'll send you a red flower.

Health: 6 gives 8 pairs (6 is divided into 2 and 4), 2 plus 8 gives 10, 10 plus 4 gives 14.

Teacher: Your method is really clever! (Operation demonstration, moving the tree on the blackboard)

Teacher: Divide 6 by 2 and 4, 2 and 8 get 10, 10 plus 4 equals 14. (Repeating while writing on the blackboard) Is there any other way?

Health: 8 trees, 9, 10,1,12, 13, 14,1* *14. (counted by the teacher)

Teacher: Well, that's awesome! Is there any other way?

Health: Divide 8 into 4 and 4, and 6 and 4 add up to 10, so the total number * * * is 14 trees. (Teacher writes on the blackboard)

Teacher: Your method is also very good!

Health: 9+6= 15, 8+6= 14.

Oh, 9+6= 15, 9 is more than 8 1, so 8+6 is less than 15 1, and 8+6= 14. (Teacher writes on the blackboard)

Health: 7+6= 13, 8+7 more 1, 8+6 more 13 more/,equal to 1 4.

(5) Summary

Teacher: Today, the children in Class 1 (2) are all great, and they have come up with so many methods. See which group sits most straight! (Draw wisdom fruit for children in groups 1 and 2)

Teacher: Animals have their own ways. Let's see (open the courseware): rabbits like to divide 6 into 2 and 4, 8 plus 2 to get 10, 10 plus 4 to get14; The courseware is stuck, so I can only read the blackboard. )

Teacher: Bear, he likes to divide 8 by 4 and 4, 6 plus 4 to get 10, 10 plus 4 to get14; Father piggy also said its way, 10 plus 6 is 16, 8 is 2 less than 10, and 16 is 2 less than 14. (Courseware recycling)

As long as the results can be calculated quickly and accurately, both methods can be used.

(6) The little white rabbit said that it had a math nursery rhyme that I missed for everyone. Please listen carefully: 8 plus a few, don't be afraid, borrow two and make ten, which is correct and fast. Let's read it together! (It's better to guide students to read it twice than fingers "2" and "10")

Second, explore independently and consolidate practice.

1, summer flowers bloom.

(1) Teacher: Many trees are planted in spring. Summer is coming, flowers are blooming, and many butterflies are flying in the beautiful flowers. Can you ask some math questions? There are some mistakes in the courseware, which are different from the number of butterflies in the textbook.

Health: 8+8= 16

Teacher: Oh, you have listed the formulas. Can you tell me the problem?

Health: A * * *, how many butterflies are there?

Teacher: Please open the second question on page 75 and do it. (The textbook Butterfly is 8+7= 15)

(2) Teacher: I also found dragonflies among the flowers. Please look at this picture and make up a math story to tell your deskmate.

Health: There are four dragonflies on the left and eight dragonflies on the right. How many dragonflies are there in a * * *?

Health: How many dragonflies are there on the right than on the left?

Teacher: Dragonfly, we only use the unit. Can you say that again?

Health: How many dragonflies are there on the right than on the left?

Teacher: You observe very carefully. How many dragonflies are there in that * * *? How do you calculate it?

Student (all): 8+4= 12 (open courseware)

Teacher: What else can I do?

Health (partial): 4+8= 12

2, the golden autumn harvest hope (star-picking game).

(1) After summer, we came to autumn. I don't know if you have noticed, but the night sky in autumn is beautiful. Today, let's play the game of picking stars together. (Lesson preparation language: Look-the twinkling starry sky, the stars are waving to the children, and they say they will play the game of picking stars with the children. )

Teacher: Please open the oral card on the desktop. When you have worked out the answer, please raise your hand and choose the stars.

Teacher: Which group performs best? I ask this group to pick the stars.

Teacher: Please go to the third group first.

Teacher: Please take it gently and return to your seats gently.

Teacher: What's your answer?

Health: 14.

Teacher: Can you tell us the whole formula?

Health: 8+6= 14

Teacher: Group 4.

Teacher: The second group.

Teacher: The first group.

Teacher: Are you happy to pick the stars? Put the stars away and put them in the drawer.

Every child goes to the stage to pick up stars. There was some confusion, but all the children happily returned to their seats. )

(2) Play small hand games and rearrange children's discipline.

Teacher: Clap your hands.

Health: I'll shoot with you.

Teacher: Please do it with me. (patting the shoulder)

Health: I'll do it with you.

Teacher: Please do it with me. (patting his waist)

Health: I'll do it with you.

Teacher: Please sit with me. (correct posture)

Health: I'll sit with you.

Teacher: The first group and the fourth group are the fastest this time. Give them wisdom.

3. Store food in winter.

(1) Teacher: Autumn has passed, and now it is winter. It is really cold in winter. Children should put on more clothes to avoid catching a cold. Look, the little ants are coming to move the food. He moved so much food, but he couldn't find his house number. Can you help this little ant?

Health (all): Yes.

(2) Teacher: Please open the ant map in question 4 on page 75 of the textbook. Let the children start connecting their books. (The teacher goes down to check the students' completion)

(3) Teacher: Let the children look at the big screen. Teacher Chen also helps ants find their own homes. I don't know if it's right. Please come and have a look. (Courseware demonstration)

The student shouted: 2+8 ant can't find its home, so I drew a house number 10 for it.

Teacher: Well, you are really something!

Fourth, summarize and extend.

Teacher: Today, we learned the carry addition of 8 plus several together. The children came up with many ways. As long as the calculation is fast and correct, different methods can be used. So, Miss Chen wants to ask, what did you learn today?

Health: I have learned nursery rhymes.

Student: I learned to add 8.

Health: I learned to pick stars.

Health: I will help ants find a home.

Health: I learned to find a stick.

Health: I learned spring, summer, autumn and winter.

Teacher: Please tell the children what you learned about math today and your parents.

Blackboard: 8+6 = 14 9+6= 15

/ \ 8+6= 14

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8 + 6 = 14 7+6= 13

/ \ 8+6= 14

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Teaching reflection

First, the eve of instructional design.

After receiving the notice from the superior, I will attend the experimental class in the base school in another week, and I am extremely anxious: what topic should I choose? After a class, I consulted the math teachers in grade one and grade three, and finally decided on the topic "How many trees are there?". However, the calculation class is really difficult for me, but I also decided on the topic.

I finally got through the weekend and finally wrote a rough teaching design. After the collective lesson preparation time, I briefly introduced my teaching design in the form of a lecture. The teachers in the math group put forward their opinions and suggestions, and I revised them again and again. It was not until Thursday noon that I redesigned the star-picking link and bid farewell to the bitter days of teaching design.

Designing a project needs inspiration, and inspiration sometimes flashes by. The innovation of math teachers is to keep their math classes active.

Second, teaching reflection

1. This lesson further feels the diversity of calculation methods by learning the carry addition of "8 plus several", and highlights the optimal calculation method of "complement ten method". Introduce the situation of "spring, summer, autumn and winter" and the familiar living environment of children, and cultivate the education of children's greening environment. In teaching, I pay attention to cultivating students' ability to ask questions, solve problems and operate independently, and at the same time cultivate students' mathematical language expression ability. For example, show "How many trees are there", guide students to look at the pictures carefully and ask students to ask math questions; Learn how to calculate 8+6, let students pose with sticks and talk to their deskmates; In the consolidation exercise, guide students to make up math stories and cultivate children to express math language completely; Design a star-picking game, let all students participate in it, and cultivate children's interest in mathematics.

2. In this class, children are playing in schools and middle schools, and the class is very lively. Many parents and teachers followed, but the students were not timid. They still dared to express their ideas in their own language. Because children basically know how to calculate "8 plus decimal addition" before class, each child has his own calculation method, which fully reflects the diversity of calculation methods. But I still prefer to let children optimize the calculation method, so I use mathematical nursery rhymes to reflect the optimization calculation, so that children can find simple ways to do problems in the diversification of algorithms.

3. Disadvantages:

1) The four seasons "spring, summer, autumn and winter" are not in place, and there is a lack of careful consideration when preparing lessons.

2) When breaking through the difficulties, if the time is not in place, 3 minutes should be added.

3) Algorithm diversification is an important idea of mathematics curriculum standards, and children are encouraged to learn algorithm diversification. However, I still have my own prejudice about learning level. I expect students to be more inclined to "fill ten methods", which is a bit stifling children's open mathematical thinking. But this is also a direction of my thinking, how to better integrate the two?

4) Not paying enough attention to students, teaching according to their own ideas, ignoring the most important learning situation.

4. Classroom episode

Just as I was talking about the beautiful scenery of "summer", a parent came from behind. She took most of the classroom to her daughter (who was sitting in the front row against the wall), grabbed her toy and walked back to her stool. At this time, I was standing in the third row, and her daughter was behind me.

I forgot my expression at that time. I was stunned for at least 10 second. Seeing my parents coming back, I have entered the role to give lectures.

On Sunday, I sent a message to consult the parents who were observing the teaching. Please give your valuable advice.

The parent above replied to me: Hello, Mr. Chen, I went to your class on Friday and found it very lively and interesting, so that every student could devote himself to his study. The previous teaching methods can better open children's thinking, and now the learning environment and equipment are so good that I feel that children are really happy to study in such an environment! What I want to say most is that Mr. Chen is really a good young, beautiful and talented teacher and is very popular with children. My daughter and I like you very much. I found that Wang Mengqi didn't understand eight plus a few and borrowed a few, but she could work out the problem. She could work it out. Ok, Mr. Chen, that's all. Have a nice weekend! 88 Wang Mengqi's mother

For the first time in my teaching career, I really don't know how to deal with such a situation. Maybe his ability to improvise is very poor. But at that time, I really didn't find anything in her children's hands, which also made me have a question: how to pay attention to the every move of 50 students with two eyes in class?

How many trees (carry plus 8 plus a few) teaching design

Teaching content: the carry addition of "8 plus several" and its law of 8 plus several carry addition on page 74 of the first volume of mathematics published by Beijing Normal University.

Teaching objectives:

1. Enable students to independently explore various methods of calculating 8 plus several on the basis of existing experience, reflecting the diversity of algorithms; Make students further understand the "plus ten method" and calculate 8 plus several correctly and skillfully;

2. Cultivate students' practical ability and preliminary observation and comparison ability;

3. Cultivate students' awareness of cooperative learning and mathematics application; Can find and put forward simple mathematical problems from daily life and real situations, and can apply existing knowledge, experience and methods to solve problems. In the process of learning mathematics, learn to cooperate with others and get a good emotional experience.

Teaching emphasis: to further understand the "ten-complement method" and be able to calculate 8 plus several correctly and skillfully;

Difficulties in teaching: Re-understanding of the "ten-point method": according to the law of addition of 8 plus decimals, correctly and skillfully calculate 8 plus decimals;

Preparation of teaching AIDS: multimedia courseware, oral arithmetic practice cards and pictures;

Learning aid preparation: great

Teaching process:

First, learn new lessons.

1, Introduction: Today, Grandpa Wisdom will take the children to experience the four seasons in a time spaceship. Do the children want to go? Do you know which four seasons are all the year round?

Our first stop is spring. Spring is coming,

Spring has come, and the fields are green. March 12 is Arbor Day every year. On this day, people must plant many trees to green our environment. Now Mr. Chen will take the children of Class 1 (2) to plant trees, ok?

(1) Teacher: Let's count how many trees are to be planted in the first row. (The teacher put it up first and tore the paper out) What about the second row? (Eight students, six students)

(2) Teacher: What math questions can you ask after seeing this picture? Please turn your head quickly and raise your hand to answer Mr. Chen's question. (Introduction: How many trees can a * * * plant? )

Who can work out the formula of this problem? (Student: 8+6, teacher's blackboard 8+6) Oh, you all know his math, but Mr. Chen doesn't know how to calculate it. I want you to help me solve this problem, okay?

(3) Teacher: OK, now let's ask the children to make a pendulum first. Before you swing, please listen carefully to the requirements: replace the small tree with a stick in your hand, swing, what is 8+6? How to calculate it? How many ways do you have? Tell your deskmate what you think. When music starts, you should stop and sit up straight. Ready, go!

(4) (Music starts, indicating students to sit up straight) Now please tell us about your own algorithm:

Students may have the following situations:

1) Count from 8 to 8, 9, 10,1,12, 13,14;

2) Divide 6 by 2 and 4, add 2 to 8 to get 10, and add 4 to get14;

3) Divide 8 by 4 and 4, add 4 to 6 to get 10, and add 4 to get14;

4)9 plus 6 is 15, 8 is less than 9 times 1, 15 minus 1 to get14;

5) 16 is 6 plus 65438, 8 is 2 less than 10, and 14 is 16 minus 2;

(5) Summary: You have many methods. Teacher is really proud of you! Animals also have their own practices. Let's see: the white rabbit likes to divide 6 into 2 and 4, 8 plus 2 to get 10, 10 plus 4 to get14; Bears like to divide 8 into 4 and 4, 6 plus 4 is 10, 10 plus 4 is14; Father piggy also said its way, 10 plus 6 is 16, 8 is 2 less than 10, and 16 is 2 less than 14.

As long as the results can be calculated quickly and accurately, both methods can be used.

(6) The little white rabbit said that it had a math nursery rhyme that I missed for everyone. Please listen carefully: 8 plus a few, don't be afraid, borrow two and make ten, which is correct and fast. Let's read it together! Guide the students to read it twice and tell them how to do it. )

Second, consolidate practice.

1, summer flowers bloom.

(1) Teacher's introduction: In spring, we plant trees. When summer comes, birds are singing and flowers are fragrant in the yard, and butterflies are dancing among the flowers. Please open the second question on page 75. There are 8 butterflies in the flowers and 7 butterflies are flying. What math questions would you ask? How many butterflies are there? )

How many butterflies are there? How to make a formula? (8+7= 15)

(2) I also found dragonflies among the flowers. Please look at this picture and make up a math story to tell your deskmate.

(3) Tell your own mathematical stories and formulas. Try to let the students speak freely. It used to be four dragonflies, but eight dragonflies came. How many dragonflies are there? )

Wow, the children in 1 (2) class did really well. Teacher Chen is so happy!

2, the golden autumn harvest hope (star-picking game).

(1) After summer, we came to harvest autumn. I don't know if you have noticed, but the night sky in autumn is beautiful. Look-the twinkling starry sky, the star is waving to the children, and it says it will play the game of picking stars with the children. Please open the oral test card on the desktop and raise your hand to pick the stars after you work out the answer.

(Pick stars in groups on the podium) (45 cards, 45 stars)

(2) Play small hand games and rearrange children's discipline.

3. Store food in winter.

(1) Introduction: Winter is coming, and hardworking little ants are busy. It turned out that they were preparing food for the winter, but in a hurry, they forgot the date of going home. Can children help them find their own home?

(2) Please open the ant map in question 4 on page 75 of the textbook. Let the children start connecting their books.

(3) Let the children look at the big screen. Teacher Chen also helps ants find their own homes, and you help Teacher Chen find them together.

(4) Ideological education: Only through hard work can we taste the joy of harvest and live a happy life.

Fourth, summarize and extend.

Today, we learned the carry addition of 8 plus several together. The children really came up with a lot of ideas. As long as the calculation is fast and correct, different methods can be used. So, Miss Chen wants to ask, what did you learn today?

Blackboard: 8+6 = 14 8+6 = 14

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