"Decomposition and Composition 4" Large Class Teaching Plan 1 Activity Target
1, on the basis of physical operation, understand the decomposition and combination of 4.
2. Learn to divide and combine a number in order, and guide children to draw the conclusion that the series on both sides of division and combination are increasing and decreasing respectively.
3. Cultivate children's good habit of operating records and develop their expressive ability.
4. Develop children's logical thinking ability.
5. Develop children's observation and spatial imagination.
Important and difficult
Activity focus: let children learn the decomposition and composition of 4. Activity difficulty: guide children to summarize the relationship between the two sides of the sequence in the split formula.
Activities to be prepared
Each child has four small fish, two fish tanks, a digital card of 1, 2, 3, a math exercise book, and a note with on-off numbers written on it.
Activity process
First, the beginning part: "Review the decomposition and composition of 3"
Teacher: "Last time we learned the composition and decomposition of 3, let's review it together."
Import, "Let's see what this number is?" (3) How many divisions are there for this number? (There are two kinds): (1 and 2,2 and 1). How clever these children are! Let's play a game with the decomposition of 3. I say a number, please say a number, and your numbers add up to "3". For example, "I said 1", and the child replied "I said 2".
Second, tell the problem situation and stimulate children's interest in digital decomposition and combination.
Rabbit has two fish tanks at home. The rabbit bought four goldfish. He wants to keep these four fish in two fish tanks, but he doesn't know how to divide them. He wants the children to help him divide it. Would you like to? How many points?
Third, the decomposition and combination of problem-solving comprehension 4.
1, teacher: "The rabbit has four goldfish. I want the children to divide them into two fish tanks. How should I divide them? " Who wants to have a try? ""I'll write them down, or I'll forget them later. "
2. Teacher: "The teacher has prepared a copy for each child. Please let the children share a little and take notes after sharing. " Teachers show operating materials to guide children to operate and record.
3. After the child's operation, please tell several children how to divide it, and how many ways are there. And record the children's points on the blackboard. The teacher consciously chooses two points, the sequential point and the disordered point.
Fourth, find problems and learn to divide and combine a number in order.
1, guide the children to observe and discuss: which method is good, easy to see clearly, convenient to remember and not easy to miss, and why?
2. Teacher's summary: In order, the number of one side is getting bigger and bigger, one at a time, and the number of the other side is getting smaller and smaller, one at a time. The total number of two numbers is the same, both are 4.
3, children's operation exercise: divide and match a number in order, and then record it on the paper with the divided number.
The teacher makes a summary and expresses it in split form. Read the split form with the children and explain the split score, total number and part number.
Verb (abbreviation for verb) game "Where is my partner?" Listen to music and play games.
Let children freely choose numbers [or physical cards] and hold them in their hands. When the music stops, find another digital card according to the numbers on the card and ask them to combine the numbers on the card. 4. You can change your card freely and play the game again.
Teaching reflection
This design follows the principle that "games are children's main activities" and focuses on stimulating children's interest in participating in activities.
Decomposition and learning of 1 4.
By throwing questions, the story of helping rabbits raise four fish in two fish tanks makes mathematics close to life and stimulates children's interest in exploration. As the outline points out: "Let children learn to solve some simple problems in life and games with simple mathematical methods."
Large class children have the characteristics of autonomy, initiative and self-control. I arranged the activities of operating circular cards and digital cards, so that children can explore the three-point method of 4 independently in the operation and enlighten their wisdom.
Because the children in large classes have enhanced their self-restraint, awareness of rules and persistence, when I ask for homework activities, I ask them to observe certain disciplines and cultivate their good study habits and behavior habits.
2. Guide children to summarize the relationship between the split series on both sides.
The germination of abstract logical thinking appears in large class thinking. When we know things, we can not only perceive the characteristics of things, but also make preliminary induction and reasoning. The children in this class are eager to learn, curious and like challenging learning content. Learning content should be moderately difficult and challenging. I designed the link between the two series in the division formula of inductive 4, in order to make children jump within reach and further improve their concept of numbers.
The Design Intention of Teaching Plan 2 "Decomposition and Synthesis of 4"
In some kindergartens, children in large classes can't understand the composition and decomposition of numbers, and the relationship between the whole and the parts. The synthesis and decomposition of numbers is not only conducive to training children's analytical and comprehensive ability, helping children to transition from counting activities to operation activities, but also conducive to consolidating the concept of numbers and learning addition and subtraction operations, laying a foundation for primary school mathematics learning. The quantitative relationship is the key to developing intelligence. Lack of logarithmic synthesis and decomposition ability will not be conducive to children's future mathematics learning. In order to promote the solution of this problem, the author designed and implemented this scheme.
moving target
(1) Knowledge and skill goal: Children learn the synthesis and decomposition of 4 through the distribution of fruits and the combination of flowers, and independently learn the decomposition and synthesis of 5 through learning tools.
(2) Process and Method Objective: By distributing fruits and operating school tools, children can master the methods of operation and exploration.
(3) Emotion, attitude and values: Children deepen their interest in exploration through the synthesis and decomposition of independent exploration of school tools.
Important and difficult
(1) Key point: On the basis of learning the synthesis and decomposition of 4 under the guidance of teachers, children independently explore the synthesis and decomposition of 5.
(2) Difficulties: Children independently explore the synthesis and decomposition of 5 through school tools.
Activities to be prepared
(1) Teaching AIDS: 3 cards for people and animals, 4 cards for bananas, 4 cards for apples, 4 cards for oranges, 4 cards for flowerpots, several buttons and a piece of music.
(b) Teaching objectives: all children in the second grade.
(3) Teaching place: Class Two classroom.
(4) Teaching time: 30 minutes.
Activity flow (Chinese lesson plans only, please do not add photos with children's portraits, because photos involve personal privacy and portrait rights! )
(1) Introduction (scenario introduction): (3 minutes)
Play background music to draw out the scene and attract children's attention.
Teacher: Listen! Who's calling? Yes, the bird is singing. Today, the weather is very good. Xiaohua invites foxes and giraffes to play at home. Xiaohua took out some fruits to entertain them. What fruits are there?
Teacher: (Music stops) Yes, there are bananas, apples and oranges. Xiaohua is going to give them to foxes and giraffes.
(2) Basic part (25 minutes)
1, teachers' guidance and children's independent exploration are combined to learn the decomposition and synthesis of 4.
Teachers' demonstration and children's exploration, decomposition of learning 4
Teacher: Count how many bananas Xiaohua has taken out.
Teacher: Xiaohua wants to give these four bananas to foxes and giraffes. How many shares should she share? (2 copies) How do you divide it? The teacher divided the floret (4 into 1 and 3) and represented it with the number ().
Teacher: I took out the apple again. How many apples are there? Please come up and help Xiaohua divide it, which is different from the teacher's. (When the children come up and finish dividing, show them a picture, and then let the children divide the oranges. )
Summary: There are four apples, bananas and oranges. There are three ways to divide four into two parts. The first is to divide 4 into 1 and 3, the second is to divide 4 into 2 and 2, and the third is to divide 4 into 3 and 1.
Continue the story and learn the composition of 4.
Teacher: Xiaohua invited the fox and giraffe to take a walk in the garden after eating the fruit. . Walking, Fox saw two pots of flowers. How many flowers are there in this pot (1) and in the other pot? Together, how many flowers (4) are * * * *, expressed by numbers.
Teacher: The giraffe also saw two pots of flowers. How many (2) flowers are there in this flowerpot? What about the other one? (2 flowers), how many flowers does a * * * add up to? (4 flowers), and represented by a chart.
Summary: Decomposition and synthesis of 4.
2. Let children explore the decomposition and synthesis of 5 freely through learning tools.
Decomposition of independent exploration 5
Perception and exploration
Teacher: After learning the decomposition and synthesis of 4, how can 5 be divided into several parts? (2 copies) Please take out 5 buttons and try. When the music stops, the children can't move any more.
Communication and promotion
Teacher: Everyone is finished. Now, please let two children introduce their own methods.
Teacher: How many shares did you divide 5 into? How many copies is one and how many copies is the other?
summary
5 can be divided into two parts. There are four ways. The first way is to divide 5 into 1 and 4, the second way is to divide 5 into 4 and 1, the third way is to divide 5 into 2 and 3, and the fourth way is to divide 5 into 3 and 2).
Understanding the synthesis of 5
Teacher: The teacher asked the children again. A divides the button into two parts, one is 1 and the other is 4, so how many are there? (and graphically represented)
(3) The last part (2 minutes)
Children can share their own methods with other children in the same group and discuss whether there are other methods. (Let children communicate independently. Other two points)
Activity summary
This teaching activity focuses on the decomposition and synthesis of 4 and 5, which is in line with the learning of teaching content by large class children. Children in the middle class already have the ability to understand the whole and part, but they focus on understanding the simple relationship of plane graphics. On this basis, in order to perform mathematical operations better in the future, the large class should further learn the composition and decomposition of numbers. This lesson plan only explains the synthesis and decomposition of 4 and 5. Let the children know that 1 and 3,3 and 1, 2 and 2 add up to 4, 1 and 4,4 and 1, 2 and 3, 3 and 2 add up to 5. Children in large classes have mastered these mathematical knowledge, and on this basis, they can be guided to do addition, which is convenient for them to learn addition and subtraction and let them better understand addition and subtraction.
The decomposition and composition of activity objectives of "4" large class teaching plan 3;
1. Induce, summarize and learn the composition of 3 and 4 in game activities, and know that there are two ways to divide 3 into two parts and three ways to divide 4 into two parts.
2, constantly explore the various points in the operation activities, and learn to record. Know how to exchange the positions of two partial numbers, and the total number remains the same.
3. Learn the composition of 3 and 4 in the game, and cultivate hands-on ability and observation thinking ability.
Activity preparation:
Teaching AIDS:
Stick the numbers 1, 2, 3, 4, parting number and background map (3 cars, 4 dots) on the blackboard.
Learning tools:
The child has a set of operating materials, a marker and a plate with three snowflakes.
Activity flow:
1. Create a situation to stimulate children's interest. Game: "We are all good friends".
2. Composition of preliminary exploration.
(1) Group activities: Children can operate freely. "Today, we are going to play Snowflake, ok? Then please take three snowflakes and divide them into two parts at a time and try to see how many different ways you can divide them. " Children operate and teachers patrol. Remind children to take 3 snowflakes and divide them into 2 parts.
(2) Group activities: The bus is coming. Teacher's summary: 3 can be divided into two parts, 3 can be divided into 1 and 2,2 and 1 and 2; 2 and 1 add up to 4.
The composition of 3.4.
(1) Children's operation: "colored baby dots", constantly exploring various methods of dividing 4 in operation activities, and learning to record.
(2) Let the children divide the four colored dot babies into two parts. How would you divide it? How many points?
(3) The division formula of 4: 4 written by the teacher is divided into 1 and 3,3 and 1 with the same number. Their numbers are the same, but their positions are different. As long as you know a division, you can swap the positions of two partial numbers, which is another division. The number behind the number on the left is more than the previous one 1, and the number behind the number on the right is less than the previous one 1. The sum of the two numbers is 4.
(4) Teacher's summary: There are three ways to divide 4 into two parts. 4 can be divided into 1 and 3,3 and 1, 2 and 2, 1 and 3,3 and 1, and both 2 and 2 are 4.
4, children's operation exercises, consolidate the game-"flowers and leaves": the composition of three flowers is divided into two parts, and the composition of four leaves is divided into two parts.
5, collective evaluation of children's operation exercises, to further consolidate the composition of 3 and 4.
The synthesis and decomposition of active reflection number is the basis and potential knowledge point of addition and subtraction, and it is an applied problem of the relationship between department and general subject, so the process of decomposition and synthesis should be highlighted when teaching this part. From this, I realized that teaching should not only teach the current knowledge points, but also serve the future teaching.
"Decomposition and Combination 4" Teaching Plan 4 Big Class Education Concept
It is necessary to stimulate students' enthusiasm for learning, provide them with opportunities to fully engage in mathematical activities, and help them truly understand and master basic mathematical knowledge and skills, mathematical ideas and methods in the process of independent exploration and cooperative communication, so as to gain rich experience in mathematical activities. Students are the masters of mathematics learning, and teachers are the organizers, guides and collaborators of mathematics learning.
Activity objectives:
1. Induce, summarize and learn the composition of 3 and 4 in game activities, and know that there are two ways to divide 3 into two parts and three ways to divide 4 into two parts.
2, constantly explore the various points in the operation activities, and learn to record. Know how to exchange the positions of two partial numbers, and the total number remains the same.
3. Learn the composition of 3 and 4 in the game, and cultivate hands-on ability and observation thinking ability.
4. Improve the ability of logical reasoning and form a good habit of doing things in an orderly way.
5. Know that sorting according to different characteristics of things will have different results, and initially understand the reversibility of sorting.
Activity preparation:
There are some pictures of lotus leaves and dragonflies, blackboards and sweets.
Activity flow:
1. Create a situation to stimulate children's interest. Game: Divide dragonflies.
2. Composition of preliminary exploration.
(1) Show the pictures of three dragonflies, let the children use their brains, divide them into two parts and ask the children questions.
(2) Teacher's summary: There are two ways to divide 3 into two parts, 3 can be divided into 1 and 2,2 and 1 and 2; 2 and 1 add up to 3. Let children read and deepen their image.
The composition of 3.4.
(1) Show four pictures of lotus leaves and let the children use their brains to divide them into two parts.
(2) How would you divide the lotus leaf into two parts? How many points?
(3) The division formula of 4: 4 written by the teacher is divided into 1 and 3,3 and 1 with the same number. Their numbers are the same, but their positions are different. As long as you know a division, you can swap the positions of two partial numbers, which is another division. The number behind the number on the left is more than the previous one 1, and the number behind the number on the right is less than the previous one 1. The sum of the two numbers is 4.
(4) Teacher's summary: There are three ways to divide 4 into two parts. 4 can be divided into 1 and 3,3 and 1, 2 and 2, 1 and 3,3 and 1, and both 2 and 2 are 4.
4, children's operation exercises, consolidate the game-"Divide candy": 3' s composition is divided into 2 copies, and 4' s composition is divided into 2 copies.
5, collective evaluation of children's operation exercises, to further consolidate the composition of 3 and 4.
Activity reflection:
Teaching should not only teach current knowledge points, but also serve future teaching. On the one hand, a well-prepared classroom atmosphere is better and children are highly motivated. On the other hand, it is not enough for children to do more work and explore.
Teaching reflection
In this lesson, according to children's thinking characteristics and learning rules, I help children really master the concept of numbers by fully operating, establishing and understanding the meanings of numbers and symbols in relaxed games. In the activity, I chose a small box, an apple picture and a small pocket, which children are familiar with and like to play with. This can not only make children exercise the flexibility of small hand muscles in activities, but also integrate the collocation exercises of several things in mathematics into them, making mathematics activities more interesting. Interesting games stimulate children's desire to participate in activities and have fun in operation.
I am the introducer and participant of the activity, and I am the playmate of the children. When children have difficulty in activities, I am a little anxious and tell them repeatedly. At this time, the child seems to have no confidence. In the future teaching, I will give timely guidance and encouragement, and listen to the children's discussion and expression.
Teachers should have a tolerant heart. When we face all children, we should pay special attention to individual differences, especially in the transmission of materials. We should fully consider the needs of different children and give targeted guidance.