The first lesson of the second unit of the fifth grade of primary school mathematics of the People's Education Edition.
Opening remarks: Dear judges and teachers, hello everyone!I am the No. 4 candidate in the interview for primary school mathematics, and the topic of my trial lecture today is "Position", so let's start my trial lecture:
1. Contextual import.
Teacher: Class!Hello students, please be seated!
Teacher: Students, let's take a look at a **, there is a row of children in the classroom in the picture. Can you tell me about the position of Zhang Liang at this time?
Teacher: Well, okay, please come and talk about it. Well, you said he was counting 3rd from the left. Awesome, please be seated. You have a different opinion, you come too!
Teacher: Ao, you said that you are counting the fourth from the right. Do you agree?Well, all agree, please take a seat.
Teacher: The two of us just now used a number to indicate Zhang Liang's position. Now the teacher would like to ask everyone, if there is not only a row of students, but like the seats in our classroom, can you still use a number to indicate the location of a certain classmate?
Teacher: Eh, I see that everyone's little faces are puzzled, as if they are not sure, today, let's learn Xi position together.
Second, ** new knowledge.
Teacher: Students, now the teacher has shown you a picture of ** on the big screen, which is the seat map of Zhang Liang's classroom. Look, how should you describe Zhang Liang's position now?Think for yourself first, and then talk to your table mates.
Teacher: Who has an idea?Okay, you're the fastest to raise your hand, please.
Teacher: Well, you said that Zhang Liang was in group 2 and number 3. Okay, please be seated. This student in the last row, please tell me about it as well.
Teacher: Ao, you said in Article 2, Paragraph 3. Your statement is also very creative, please take a seat.
Teacher: Students, although your statements are different, there is one thing that is the sameWhat do your descriptions have in common?Teacher: Boys in the third row, come on.
Teacher: When you say that there are two numbers in the description. You really have a heart, please take a seat!
Teacher: If you want to represent the location of a classmate in the classroom plane, you can't determine it with just one number. There must be two numbers. Two numbers to determine the location.
Teacher: When the students were describing Zhang Liang's position just now, the rows and rows mentioned all refer to the horizontal rows, which are collectively called "rows" in mathematicsThe groups, bars, etc., all refer to vertical rows, which are collectively called "columns" in mathematics. When determining the number of columns, we agree to count from left to right, and from front to back when determining the number of rows.
Teacher: Now let's talk about Zhang Liang's position. That's right, column 2, row 3!
Teacher: We used the number of rows and the number of columns to describe Zhang Liang's position, and also marked Zhang Liang's position on the floor plan, so what method do we use to represent and record Zhang Liang's position?Students, use your brains, think about it, and get started.
Teacher: Who has an idea?The tall male student in the last row, please come and say. Oh, you said in words, you can also use symbols, your idea is very good, please take a seat!
Teacher: Who else would like to say? The students in the first row who raised their hands, you say!
Teacher: Oh, you said that it is represented by "columns" and "rows". First of all, you can say either one. You may be seated!
Teacher: Students, you have all expressed your thoughts. Actually, there is a uniform representation in our mathematics. Zhang Liang's position is in the 2nd column, the 3rd row, which we use to represent the number pair (2, 3).
Teacher: In this way, two numbers are used to represent columns and rows, the number in front represents the column, the number in the back represents the row, the two numbers are separated by a comma, and small parentheses are added outside the two numbers to indicate that they are a whole, and two numbers like this are called "number pairs", taking Zhang Liang's position as an example, they can be read directly (2,3) or they can be read as number pairs (2,3).
Teacher: Students, according to what the teacher said, let's talk about the positions of Wang Yan and Zhao Xue. Compare to one to see who says it faster and see what the difference is?Before and after the four people in a group discussion discussion, start.
Teacher: Okay, students, the teacher's voice is getting quieter when he hears everyone's discussion. Which group would like to talk about it?
Teacher: Okay, you can send a representative!
Teacher: Oh, you said that Wang Yan is in the 3rd column, the 4th row, which is represented by number pairs (3, 4), and Zhao Xue is in the 4th column, the 3rd row, and the number pairs are represented by (4, 3), the voice is so loud, please take a seat!
Teacher: Okay, which group noticed their differences?Okay, sail group, come on!
Teacher: Well, you said that their numbers are all 3 and 4, but because they are in different positions, they are represented in different positions. What a great discovery of yours!You may be seated!
Teacher: That's right, students, when we use number pairs to express them, we should pay attention to the first column, then the line. Don't make a mistake about the location.
3. Consolidate and improve.
Teacher: Students, we have learned Xi position, have you mastered it?Do you dare to accept the teacher's challenge?
Teacher: Now I'm going to give you a number pair, can you find out this classmate correctly?Come, teacher, come and see, see who can find it faster. (6,4)!
Teacher: Wow, you all raised your hands, and it seems that you have all found them. Let's check with your table mates, are all the answers correct?
Teacher: Judging by the confident smiles on your faces, it seems that you have found the right one.
Fourth, the class summary.
Teacher: The enjoyable class is coming to an end, who can share with you the results of today's Xi?
Teacher: Okay, the last classmate with glasses, come on!Well, you know how to use pairs to represent positions. Awesome, please be seated. You have additions, you come and go.
Teacher: Oh, when you say that you use pairs of numbers, you should first say columns, and then talk about lines!You've gained a lot!
5. Assign homework.
Teacher: The Xi of mathematics is not limited to the classroom, the teacher assigns two small tasks to the students after class.
Teacher: Please complete the first and second questions of the Xi booklet. Make a math bookmark for this lesson.
Teacher: Students!Class!
Conclusion: This is the end of my trial lecture, thank you judges for your patience and listening, can I erase the blackboard?