1. Let the students know the score, read and write the score, and know the names of each part of the score. 2. Through cooperation and communication, cultivate students' language expression ability and transfer analogy ability. 3. In hands-on observation and comparison, cultivate students' spirit of independent exploration and feel the application of mathematical knowledge in real life.
Key and difficult points: 1. Know how many points you can read and write. 2. Understand the meaning of how many points you can get.
Teaching aid preparation: teachers prepare multimedia courseware and physical projection; Students prepare some square paper and round paper.
Classroom process:
First of all, create a scene to enrich perception. Hello, classmate. I'm glad to study with you. I heard that the three of us (? All the students in the class are smart and active in answering questions.
1. Projection shows a square piece of paper.
2. Observe the discussant: Please look at the picture carefully. What do you know from the picture? Health: Square paper is divided into four parts on average, of which 1 part is colored. Teacher: Which score can be used to represent the colored part? Health: It can be expressed by a quarter. Teacher: Can anyone tell us why it should be represented by a quarter? Health: A square is divided into four parts on average, and only one part is colored, so the colored part is a quarter of it. Teacher: What you said is really good!
Show me the topic: Do you know 25 cents? Student: Teacher: We have known each other for several minutes. We will know each other for a few more minutes in this class today. (blackboard title: how many points)
Second, independent exploration and construction of new knowledge
Teacher: The teacher prepared 1 piece of paper with squares for each student, and divided it into four pieces on average. Please paint with your favorite color according to your own ideas, and paint as much as you want. The colored parts are expressed by scores. After painting, talk to each other in the group. Students actually operate. Teacher: OK, let's ask some students to show their works. (Name three students) Who wants to show your work to everyone? The teacher has a little gift for you. The teacher asked: ① How many copies did you draw? ② What was the score for the color part? (The teacher randomly wrote on the blackboard: ③ Why use this score (or your reason) ④ What score is used for the uncolored part? Teacher: These squares are evenly divided into four parts, and the number of colored parts is represented by several quarters. Teacher: Who can say how many quarters are made up of two quarters? How much is three quarters? How many quarters are four quarters? Teacher: Several quarters are made up of several quarters; Several quarters and quarters just take different copies. 2. Know how many tenths of the projection shows 1 decimeter. Teacher: Please look at the big screen and divide the ribbon of 1 decimeter into 10. Teacher: Which fraction means 1? So which number of copies is used to represent 5 copies? What about seven copies? (The teacher scribbles on the blackboard) 3. Several teachers: Let the students fold the prepared round paper at will, choose a few colored ones, and then use the score to indicate the colored parts. Then exchange your thoughts with your deskmate. Students actually operate. Teacher: Such figures are all scores. Teacher: Can you just say a score? (Group discussion) 4. Know the names of all parts. Teacher: I know so many scores. Do you know the names of all the parts of the score? Let's guess first. Students make bold guesses and report. Please find the answer from page 94 of the textbook! Teacher: What is the small horizontal line in the middle of the score? What are the numbers below the fractional line? What's the number on the score line? Teacher: The average score of an object or number is the denominator of this number, and the number representing such 1 or several copies is the numerator.
Three: practical application
1. Please complete the question 1 on page 95 of the textbook. 2. Complete the fourth question on page 97 of the textbook. 3. Complete the fifth question on page 97 of the textbook. 4. Complete the seventh question on page 97 of the textbook. 4. Summary: Students, what have you gained in this lesson? Who wants to tell everyone what you have gained? Can you say a few words in combination with the actual life? Thank you!