1. The synthesis and decomposition of design intention number is an important part of number concept education. The new "Outline" requires children to "perceive the quantitative relationship of things from life and games", and also pays attention to children's ability to explore, operate, communicate, solve problems and cooperate. This semester, the children in the big class have learned the decomposition and synthesis of numbers within 6-9, and have some experience in the synthesis of numbers. 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. Second, the activity goal of 1, through hands-on operation, guide children to perceive the decomposition of 10 and master the nine points of 10. 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. Third, the activity focuses on the relationship between the whole and the part, learning and recording the nine points of 10. Fourth, the activity difficulty summary. The law of decomposition and synthesis of numbers within 10 is summarized. 5. Prepare a teaching video CD for the decomposition and synthesis of numbers within 1 and 10. 2. Some pictures of dwarfs and small houses. 3. Some digital cards. The activity process of intransitive verbs (1) reviews the composition and decomposition of numbers learned before in the form of questions and answers. Teacher: I ask and you answer. What is the sum of 9 divided by 3? (Children clap their hands to answer) (2) Learn the composition and decomposition of 10. 1, story import. Teacher: In a dense forest, there lived a beautiful Snow White. Today, Snow White is very happy, because a small guest has come to visit the forest. Look, here they come. Question: How many dwarfs are here? < 2 > 10 The dwarf wants to live in two small houses. How should they live? Introduction of the topic "Decomposition and Synthesis of 10". 2. Children begin to operate, put the dwarf card of 10 on the table, and remember all the points they think about 10 to help Snow White make different arrangements. <1> Divide the children into 10 groups with four people in each group. < 2 > Please ask one child in each group to take notes, and the other children to do the operation. < 3 > according to the children's operation, the teacher summed up nine methods to divide1010/kloc-0 ∧∧∧∧∧∧∧∧∧. 9 2 8 3 7 4 6 5 5 9 1 8 2 7 3 6 4 3, guide children to observe the decomposition formula of 10, and find the synthesis law of the internal number decomposition of 10: except 1, the types of each sub-method are less than their own1; Decompose a number into two smaller numbers, and the sum of the two divided numbers is the original number, that is, the whole is greater than the part; Divide a number into two parts. If one part increases 1 and the other part decreases 1, it is the law of addition and subtraction. Law of exchange. 1 0 ∧19283746564738291(3) consolidation exercise1,card number101010. If two numbers add up to 10, connect them with a line). 3. Decomposition and synthesis of teaching video within10. (4) Game activity 1, "Find a friend". Rules of the game: Please ask the children with cards in front to find the children in the seat to be "good friends", and ask the sum of the two numbers to be 10. The train has left. Rules of the game: Every child has a digital card. Find the children whose numbers on the card add up to 10, get on the bus hand in hand, and walk out of the activity room while singing the song "The train is leaving". Seven. Activity reflection: In this class, I started from the children's existing knowledge, combined with the children's actual life and age characteristics, and created a vivid and interesting story situation. Through the vivid and interesting activities such as posing, recording and talking, children were allowed to try to explore, learn and master the nine divisions of 10 independently. On this basis, children can express the process of division and integration in clearer language, and also find and summarize 10. During the activity, the children showed great interest and experienced the joy of success. The disadvantage is that in the last game session, the children forgot to find their "good friends" in a hurry; Individual children have poor hands-on ability and participation consciousness, are unwilling to communicate with their peers, and need to strengthen training.