5. Decomposition and composition of mathematics activities in kindergarten large classes.
Activity design:
The synthesis and decomposition of numbers is an important part of digital concept education. This semester, the children in the big class have learned the decomposition and composition of numbers within 2-4, and the children have had some experience in the composition of logarithm. I try to let the children do it by themselves, then record the results, find the law of decomposition and composition under the guidance of the teacher, let the children play middle school, and achieve the combination of activity goals and children's interest optimization. Recently, we learned two poems, The Name Card of the Tree and Letter from Mother Tree. The children know that autumn is coming, and Mother Tree tells the little animals to prepare for winter. Combined with the content of poetry, this activity tries to divide the house for small animals and learn the decomposition of 5.
Activity objectives:
1, children feel the decomposition of 5 through independent exploration and hands-on operation, and master the four points of 5.
2. On the basis of the decomposition and composition of perceived numbers, master the laws of number increase and decrease and mutual exchange.
3. Develop children's observation and analysis ability and cultivate children's interest in mathematics.
Teaching emphases and difficulties
Key points: perceive the relationship between the whole and the parts, learn and record the four points of 5.
Difficulties: Summarize the law of decomposition and synthesis of numbers within 5.
Activity preparation:
Teaching AIDS: a large wall chart (there are two houses on the map, five exploded views with a space on each side of the map), five cat cards, markers and recording paper.
Learning tools: each child has a picture (there are two houses on the picture, and there is a space on each side of the picture with a score of 5), five animal cards, pencils, erasers, and 1-5 digital cards.
Activity flow:
(a), the beginning part
1, import:
Teacher: Autumn is coming. Mother Dashu is busy writing letters, writing here and there, and all the red leaves and yellow leaves are finished.
Q: Who has received the letter from Mother Tree? Guide children to answer which small animals have received the letter from mother tree.
Q: What did Mother Tree write in her letter? (Tell the little animals to prepare for the winter) Teacher: The little animals have received the letter from Mother Tree and built many new houses, ready to spend the winter warmly in the new houses.
2. Show the big wall chart and lead to the decomposition of "5". Teacher: The panda family is divided into two rooms. How many pandas does the panda family have (including six children)? Digital card showing "5".
Teacher: How to divide a cat into two houses? The panda is worried. They don't know how to divide it. There are several kinds of distribution. Please tell the children.
(2) Basic part
1, children help their little animals divide the house.
(1), children observe their learning tools, talk about what small animals they are, and count the number of small animals (5).
(2) Children divide five small animals into two rooms and record the results of each division.
2. Let the children talk about the results of their own points. The teacher recorded the children's division of labor on the record paper.
3. The teacher summed up the children's points and summed up the four points of "5".
4. Observe children's disorderly division, and guide students to decompose and combine "5" in an orderly way.
(1), while showing five cats how to divide the houses, the teacher counted the number of small animals in two houses with the children and recorded the results. "5" can be divided into 1 and 4,2 and 3,3 and 2,4 and 1.
(2) Children observe the decomposition formula of "5", initially grasp the orderly decomposition composition of "5", and understand the law of number increase and decrease and exchange.
5. The child divided the house for the small animals for the second time, trying to break down the "5" in an orderly way and recording the results of each division.
(3) End part of the game "Finding Friends"
Children each choose a digital card (1-4) to wear, and find their own number with the music of finding friends. Make friends with the children with "5".
Teaching reflection:
The design of this activity is based on the new spirit of "just want", which requires children to "perceive the quantity of things from life and games", and also pays attention to children's ability to explore, operate, communicate, solve problems and cooperate. The synthesis and decomposition of numbers is an important part of digital concept education. This semester, the children in our big class have learned the decomposition and composition of numbers within 2-4, and the children have had some experience in the composition of logarithm. I try to let the children do it themselves, and then sort out the results, and find the law of decomposition and composition under the guidance of the teacher, so that the children can learn while playing, and achieve the combination of life goals and children's interest optimization. The design idea of the activity comes from two poems we recently learned, namely "The Business Card of the Tree" and "Letter from Mother Tree". The children know that autumn is coming, and Mother Tree is busy writing letters. Mother tree told the little animals to get ready for winter. Combined with the content of the poem, this activity tries to divide houses for small animals. Children can explore and feel the decomposition of 5 independently, master the four divisions of 5, and master the number on the basis of the decomposition of the number.
The activity revolves around allocating houses to small animals. Each child is assigned to five small animals, which are different. Some are five puppies, some are five kittens, some are five rhinos, five elephants and six lions. Every child also has a picture with two houses. Lovely teaching AIDS, coupled with children's happy mood to help small animals divide the house, fully mobilized the enthusiasm of children to operate and explore independently. In the process of assigning houses to small animals and recording for the first time, the children explored four ways to divide "5" through operation and exploration. When showing children's fragrance records, some children did not find five ways to divide "4", while others divided a group of numbers that did not add up to "5". This is a child's attempt to record, and I will pay more attention to those I have not mastered well in the next link. Next, guide and observe the methods of children's disorder. The teacher demonstrated five pandas in separate houses, counted the number of small animals in the two houses with the children, and recorded the results. "5" can be divided into 1 and 4, 2 and 3, 3 and 2, 4 and 1, which leads to the orderly decomposition of "5", and children observe the decomposition of "5". Children look for small animals in the second room, master the orderly "5" decomposition composition, and record the results of each room. The activity ended in the cheerful atmosphere of "Find Friends" game, and the children achieved the optimal combination of activity goals and children's interests through exploration, operation, communication, playing and learning.