The activity goal of 1 in the "dichotomy" teaching plan of kindergarten mathematics activities;
1, can divide the object into two parts on average, and know that the whole is greater than the part and the part is less than the whole.
2. I am willing to explore a variety of dichotomy and quartering, and experience the happiness of solving problems.
3. Understand the concept of equal division and solve practical problems in life.
Activity preparation:
Courseware, all kinds of graphics (heart, rectangle, square, circle, parallelogram). This bag (8 copies each).
Teaching process:
1. Introduce the story and show the courseware with the story.
Question: Why did Big Black and Little Black in the story ask Aunt Fox to help them divide the bread? What was the result? Aunt fox tricked her into eating bread, and the two brothers had only a little bread left. Are they two stupid bears? If you were asked to help, how would you divide it?
2, the teacher operates, bisects the circle, and leads to the concept of bisection.
Fold to either side. How to verify the bisector of circle? Completely overlap after folding. This means that the two copies are the same size. (courseware explanation, physical display. )
Introduce the concept: divide a graph into two parts with the same size, which is called bisection of graph.
Explain in detail the relationship between the whole and the parts.
Which is bigger than the original? Which is smaller? The child speaks, and then the teacher demonstrates. Show two semicircles and a complete circle with the same size and compare them. It is concluded that dividing an object into two parts with the same size is called equal division, and each part is smaller than the original one.
3, the teacher operates, quartile circle, which leads to the concept of quartile.
If two little bears divide the dry bread they see into four parts, each of them eats one and keeps one, how to divide it? The teacher used round paper to operate and explained the operation method of alignment and folding twice. (courseware explanation, physical display. )
Observe the relationship between separation and wholeness. The average division into four equal parts is called quartering, and each divided part is smaller than the original one.
4. Show the square and guide children to think and operate. Divide the square into two parts and four parts.
We will divide the bun into two halves and a quarter. If Big Black and Little Black see square cookies, can they be divided into two halves and a quarter? Give children graphics to explore operations, and teachers observe and guide them. Ask, "How?" . After the children operate, the courseware shows various points.
The average of two equal parts is called two equal parts, and the average of four equal parts is called four equal parts. Each divided part is smaller than the original part.
5. Guide children to be divided into triangles and hearts, rectangles and parallelograms, and observe and tell them.
A circle and a square can be divided into two parts and four parts, so if we use rectangles, diamonds, hearts and triangles, can we divide them into two parts and four parts? Today, the teacher prepared a lot of materials for the children, and the children did it themselves. How to divide them into two parts and four parts? How many ways are there? Then tell the teacher and the children how you divide it. (The two groups are divided into two equal parts, and the two groups are divided into four equal parts)
After the conversation: Many things in life can be directly divided into equal parts, such as cloth, bread and apples. Many things can be divided into sugar, books, clothes, chairs and so on. Many things can be divided into sugar, rice, flour and meat by weight, and many things can be divided into water, oil and milk by volume.
6. Inspire and guide children to solve problems in life with the dichotomy just learned. -Separate books.
Many things in life can't be cut or cut, chairs can't be used when they are cut, and towels are broken when they are cut. Then how can such articles be divided equally? It can be divided equally according to the quantity and weight of the goods.
The teacher prepared a bag of books for each child. (Show the prepared books) Think about how to distribute them evenly according to the quantity. Inspiration: Give the book in your hand to two children. How to divide it? How many copies per person? Give the book in your hand to fourth brother's child. How to divide it? How many books does everyone have? 7. Throw questions and end the activity.
If the teacher gives you another copy, please give it to three children. How to divide it? That's all for this class. Next class we will learn the three-point method. Now say "goodbye" to the headmaster and teachers.
Activity expansion:
If the teacher gives you a glass of water, please divide it into two or four equal portions. How to divide it? If you are given a big bowl of noodles, you should divide it into two or four equal portions. How to divide it?
The activity goal of "dichotomy" 2 in kindergarten mathematics activity teaching plan.
1, let children try to divide an object into two parts during operation, knowing that part is smaller than the whole and the whole is larger than the part.
2. Encourage children to boldly try and explore various methods of dividing into two equal parts, such as visual inspection, measurement, counting and folding.
3. Guide children to speak out the operation process and results boldly.
Activities to be prepared
Teaching AIDS: two Teletubbies, a cake, 10 two-part card.
Learning tools: rectangular paper, scissors, ruler, wool, wrapping paper, straws, disks, triangles, squares, coins, broad beans, snowflakes, buttons, small bowls, 6 measuring cups, scales, cakes, tomatoes, dried tofu, knives, cutting boards, plasticine, etc.
Activity process
1. The children divided the rectangular paper into two parts.
(1) Invite two little guests to class. Who are they? They also brought their favorite cake, but there was only one cake and both of them wanted to eat it. What should we do?
(2) Let the children have a try. How do I know these two pieces are the same size? (overlapping)
(3) Teacher's summary: Divide the cake into two equal parts. This method is called two equal parts. Think about the cake. Besides, are there different ways to divide them? There is a rectangular piece of paper like a cake in front of every child. Would you please think of a different way to divide it into two parts?
(4) children's hands-on operation, showing children's points.
Ask children to compare, what changes have been made between the separated graphics and the original graphics?
(5) Teacher's summary: The children divide the rectangular paper into two parts by folding in half and diagonally, and divide it into two figures with the same size.
2, children's grouping operation, try to use a variety of methods to divide.
(1) Teletubbies invites you to visit Baby Paradise. Would you like to? When playing, children should visit in an orderly way to see what is in the park. The teacher introduced various materials and asked the children to help divide the content into two parts.
(2) Children are free to operate, and teachers focus on guiding balance weighing and object classification.
The first group: circle, triangle, square, scissors, straw. The second group: wool, ribbon, ruler and scissors. The third group: coins, broad beans, snowflakes and so on. The fourth group: measuring cup and water. Group 5: balance, plasticine, cake, tomato, dried bean curd, knife and chopping board.
3, children say the operation process and method.
(1) The child got a lot of things. Please think about what you have divided. How to divide it?
(2) Children say various points, and teachers guide children to think about when to use visual inspection and counting.
(3) Teacher's summary: Children divide things in the park into two parts by visual inspection, folding, measuring and counting.
4, the game "See Who's Right", Teletubby wants to play games with you, please look at the picture and tell me if it's second class? Who is faster than who?
5. Extended activities
Life is divided into two parts. How many parts can it be divided into? I will continue to learn quartiles, quintiles and so on in the future.
Activity goal of "Dichotomy" 3 (1) in the teaching plan of mathematics activity in kindergarten;
1. Try to divide an object into two equal parts, knowing that some parts are smaller than the whole and the whole is larger than the part.
2. Use dichotomy knowledge to solve problems in life and experience the joy of success.
(2) Activity preparation
1. Waxed paper: round, square, heart-shaped, lace-shaped, foam square, one piece.
2. Peanuts, red beans, red dates and soybean kernels.
3. Two story wall charts, several blue plastic wall charts, several small wall charts and audio tapes.
(III) Activity process
Aunt Fox said, "Don't worry, I'll take a bite of this bigger one."? As soon as the two brothers saw it, the big one became smaller and the small one became bigger. They were so anxious that they shouted, "No, no, one is big and the other is small. "... In this way, Big Black and Little Black only ate a little bread and didn't know that they had been taken in by the fox.
Teacher's question: Kid, if you meet two brothers, would you like to help? If the teacher gives you a bun, will the children share it? How can I divide it into two pieces of bread of the same size? The teacher provides round paper to guide the children to find ways to divide them into two parts of the same size for the children to operate.
Discussion: Who will tell you how you divide it? How do you prove that your share is the same size? The teacher encourages young children to think of various ways to prove it.
2. Divide several kinds of figures in different ways. The teacher said, "The children will divide the buns. If the two brothers picked up heart-shaped bread, square bread and lace-shaped bread, would the children share them? How can I divide it into two equal parts? Teachers provide all kinds of graphics, children operate, teachers participate in group activities, and encourage children to explore various methods of graphics.
3. Understand the relationship between the whole and the parts
(1) In the group communication, please tell the children the division of various graphics. The teacher said, "Who will tell you how you divided the aspect package into two equal parts?"? Who else divides the square into two parts with the same size in different ways? " Ask the children to tell the difference between heart shape and lace shape in the same way.
The teacher summed up: "by folding in half, we divide these figures into two parts with the same size, which is equal division."
(2) Teachers and students discuss with each other and explore other methods of dividing squares.
The teacher took out the square foam and showed it to the children. The teacher randomly puts a small stick on it and divides it into a point to see if it can be divided into two parts if it is not diagonally divided or folded in half at the center of the edge. Verify according to the operation situation, so that children can learn more.
(3) Guide children to understand the relationship between the whole and the part.
Teacher: "We just divide the circle, square, heart and lace into two parts with the same size in different ways. Please see which meter is larger than the original number. " Which is smaller? What was the original number? (half)
4. Solve new problems.
The teacher asked: "bread 1 piece, snacks 1 piece." Two little bears share it, and one eats only half. If there were two snacks and two loaves of bread, how much would each of them eat? " If there are four apples, how many will each of the brothers eat?
Teacher: "Today, children help two brothers share bread and snacks. Mother bear is very happy. Mother bear is going to cook eight-treasure porridge for the children now, but mother bear says the ingredients of eight-treasure porridge should be cooked in two parts. Now, children, can we help mother bear distribute the ingredients? " (Good) Let's look at what's in the ingredients first, including 4 red dates, 2 peanuts, 2 red bean kernels and 2 soybean kernels. Let the children divide the ingredients in the basket into two plates in pairs, and pay attention to the same amount when dividing.
The teacher provides the ingredients and the children discuss the operation. After the division, the teacher asked collectively, "Children, how many red dates are there on your plate?"? How many peanuts are there? How many red bean kernels are there? How many soybean kernels are there? Well, the children are so smart, they are all right!
5. Conclusion:
Teacher: Well, the clever children have helped Brother Bear divide the bread of different shapes into two equal parts, and taught Brother Bear the knowledge of bisection. To thank everyone, Brother Xiong now invites the children to play games outside.