First, introduce games to stimulate interest. Teacher: Here is a box with a bow in it. Who can guess what color this bow is? The color of the bow in the box is certain. Why are there so many different answers? ..... Teacher: OK, the teacher will give you a hint: pink and green. What color will it be? Teacher: If we want to guess the color of the ball accurately, we all have a unified answer. What shall we do? (Student: The teacher should give us more hints. ) teacher: meet your wish, the second hint: not green. Teacher: Yes, only by giving enough hints can we guess correctly. Now there is a yellow ball and a white ball. They are hidden in my two pockets. Please guess who is hiding in my left pocket and who is hiding in my right pocket. (Students guess) Why do people guess differently? Student: The teacher hasn't given us a hint yet. ) teacher: now I'll give you a hint: there is no white ball in my left pocket. Can you guess? Guess again, and tell me what you think? On what basis do you know the result? ) teacher: why is the result of this guess the same? (Health: There are only two colors: yellow and white. If you say there is no white ball in the left pocket, it must be a yellow ball, and the one on the right is a white ball. ) teacher: it seems that everyone is very smart and can draw the correct conclusion according to the tips given by the teacher. This kind of thinking process is called reasoning. Today, let's learn some simple reasoning together. Second, explore independently and comprehend new knowledge. 1, guess two objects: (1) Teacher: Who wants to play this guessing game with the teacher? Show your math book and Chinese book, and invite a student (Kotete) to the stage. Give you a book, don't let everyone see it. Teachers and students each share a book. Teacher: Can you give us some hints like I did just now? Tingting: I didn't take my math book. ) Teacher: So which book did Kotete take? What book is the teacher holding? Tell me how you guessed. Based on what information did you know the result? ..... Teacher: You are great! Be able to exclude math books and determine Chinese books according to what this classmate just said. The reasoning method you just used is called exclusion. Teacher: Do you want to play now? Ok, two people cooperate, take out the small cube and play this game. (1, classmates play at the same table; 2. Show two groups) 2. Guess three objects: Teacher: Our game is really fun, attracting Xiaowen and Obana Xiaoming. They said they would test everyone. See what their problems are. Teacher: What books are they holding? Please use your head first and connect them on the exercise paper. (Students complete the connection separately) What do you think of a group of four? Who wants to tell everyone what they think? Teacher's summary: Xiaowen took a Chinese book, which can be confirmed. Then the other two took a math book and a social book, the same as the topic just now. Guess two objects by elimination. Third, practical application is consolidated and improved. (Exercise after class) Fourth, the game: wear a hat. Teacher: Do you still want to play games? Teacher, here are three "hats" (made of cardboard last night), which are red, yellow and blue. Listen carefully to the requirements first: Please close your eyes for the three students wearing hats, and the teacher will put hats on you. When I say you can open them, you can immediately see what color the hats of the students next to you are, and then the student who can tell the color of their hats the fastest is the champion. Do you know how to play? (Everyone likes this game, and it has been played three times. ) 5. knowledge application. Teacher: What the students said just now was really good, and the reasoning process was very smooth. Now you can play in groups of four and take out your school supplies, which can be three books or three pens with different colors. Let the students in the group guess. You can take turns guessing. Let's see which team plays best. (1) The group independently sets the questions. (2) Draw 1 group for execution. (Xie Yunqian, Chen Peiyin, Li, Zhai Yingshuo) Xie: Our cards are pink, yellow and green. I didn't choose green. Qi: I didn't take the yellow. Teacher: Let me give you a suggestion: Can one person say "I took …" and the other person say "No …"? X: I chose pink. Qi: I didn't take the yellow. Zhai: I guess right away: Xie Yun took pink, Chen Peiyin took yellow and Li took green. The three of them show the cards to everyone. What a great foursome! Due to time constraints, the other four groups were not invited to show it.

65438+Parents' Open Day in mid-February, I am also preparing for this course. Come on!