1, in specific cases, explore the method of determining the position, and use several pairs to represent the position of the object.

2. Ask the students to determine the position in pairs on the square paper.

Emphasis and difficulty in teaching

Teaching focus

The position of an object can be represented by several pairs.

Teaching difficulties

The position of an object can be represented by several pairs, which can correctly distinguish the order of columns and rows.

teaching tool

multimedia courseware

teaching process

First, import

1. There are many students in our class, but most students and teachers don't know each other. If I want to invite one of you to speak, can you help me think about how to express it simply and accurately?

2. Students express their opinions and discuss how to use them. Which column and which row? Express it in a way.

Second, new funding.

1, teaching example 1

(1) If the teacher uses the second column and the third line to indicate the position of his classmate, can you also use this method to indicate the position of other classmates?

(2) Students practice showing other students' positions in this way.

(3) Teaching method: the position of XXX is in the second column and the third line. We can express it like this: (2, 3). Can you write down your position according to this method?

2. Practice

(1) The teacher reads the name of a classmate in the class, and the students write his exact position in the exercise book.

(2) When do you need to locate yourself in your life? Talk about the way they determine their position.

3. Teaching Example 2

(1) We just learned how to express the position of our classmates. Now let's see how to show the location of the venue on such a schematic diagram.

(2) According to the method of example 1, the whole class discussed how to display the gate position. (3,0)

(3) Discuss and tell the location of other venues at the same table, and answer by name.

(4) students mark the data on the diagram according to the data given in the book? Panda Pavilion, Aquarium and Elephant Pavilion? The location of.

Third, practice.

1, P20 Do it.

(1) Students independently find out where the letters in the picture are and tell the answers.

(2) Students mark the positions of letters according to the given data, and connect them into figures in turn, and check them at the same table.

2.P23 Question 7

(1) Write the position of each vertex on the graph independently.

(2) Vertex A is translated 5 units to the right. Where is it? What data has changed? Point a is further shifted upward by 5 units. Where is it? What data has also changed?

(3) Translate point B and point C according to the method of point A, and get a complete triangle after translation.

(4) Observe the pictures before and after translation and tell me what you found. (The graph remains the same, the column, that is, the first data changes when moving to the right, and the row, that is, the second data changes when moving up).

Fourth, homework

Exercise 5 1, 2, 3, 4, 5.

Summary after class

What other examples of using number pairs to determine the position in life? Can you give some examples?

homework

1. In the music class, Cong Cong sits in the second row of the fourth column of the music classroom, represented by several pairs (4,2). Obviously, he sat in the first position directly behind Cong Cong, and this obvious position was represented by several pairs as ().

A.(5，2) B.(4，3) C.(3，2) D.(4， 1)

2. If point A is (1, 5), point B is (1, 1), and point C is (3, 1), then the triangle ABC must be a triangle ().

A. acute angle B. obtuse angle C. right angle D. isosceles

Write on the blackboard.

Write the number of columns first, separated by commas, and then write the number of rows, and enclose the numbers in parentheses.

Using Number Pairs to Determine Position Teaching Plan (2) Teaching Objectives

1 knowledge and skills:

Let the students know the rows and columns according to the specific situation and understand the meaning of number pairs.

Several pairs can be used to indicate the position of an object in a specific situation.

2 process and method:

Make students experience the exploration process from existing experience to determining the position of an object with number pairs, and experience the necessity and simplicity of determining the position with number pairs.

3 Emotional attitudes and values:

Infiltration? Combination of numbers and shapes? Develop students' concept of space.

Experience that there is mathematics everywhere in life, resulting in a sense of intimacy with mathematics.

Emphasis and difficulty in teaching

The teaching emphasis of 1

Through the exploration process of determining the position of an object with number pairs, I know the method of expressing the position with number pairs.

2 Teaching difficulties

Flexible use of number pair knowledge to solve practical problems.

teaching tool

Multimedia equipment

teaching process

Teaching process design

1 Create a situation to stimulate interest introduction.

Teachers' courseware shows the class situation of multimedia classroom.

This is a multimedia class. Each student has a separate desk. In front of the classroom is the console, and at the lower left of the console is the seat map. If a student has questions to ask the teacher, just press the button on the secretary's desk, and the red light at the corresponding position on the seat desk will light up, so the teacher will know who wants to speak.

The teacher plays the animation. At this moment, the red light is on. Who asked the question?

Student (looking at the red light in the courseware) Sean is asking questions.

Teacher, do you want to know which one is Sean? Then let's look for it.

Shall we continue to study together in this class? Determine the location? .

On the blackboard, it says Chapter II Location 1 Determine the location.

2 Explore new knowledge

[1] Find Sean's location.

The courseware shows a panoramic view of the multimedia classroom. Please study the relationship between the seating chart and the students' seats carefully and find out which one is Sean. You can look at the textbook on page 19 and mark Sean's position in the textbook.

Students look for Sean's position in the textbook.

Teacher, how do you know this is Sean?

The red light is in the second row, and Sean is in the second row of the student seat.

[2] Clear the meaning of grade

Is Mr Sean in the second row and the third row?

Courseware display is called vertical in mathematics? Column? , horizontal call? Okay？ . ? Column? It is customary to count from left to right, followed by 1 column and 2 columns? Okay？ Traditionally, it is 1 line and 2 line from beginning to end.

Class, is Sean in the second column and the third row?

Life is.

Writing on the blackboard (column 2, line 3)

[3] Understanding number pairs

Teacher, can we still use our seats for convenience? Is it right to count? To show. The first number in parentheses represents a column, and the second number represents a row, separated by commas. Sean's position in the second column and the third row can be represented by several pairs (2, 3).

According to the habit of description, what do you think these two numbers in brackets mean?

The first number in brackets indicates which column and the second number indicates which row.

Blackboard writing (2, 3)

[4] Use number pairs to indicate position.

Teacher, can you use several pairs to indicate Rebecca's position?

Rebecca's position is shown in pairs as (3, 4).

What do 3 and 4 in brackets mean?

Health 3 means Rebecca is in the third column, and 4 means Rebecca is in the fourth row.

Teacher, can you show the location of Zhao Xue in pairs?

Zhao Xue was born in the fourth column and the third row, and the number pair is (4, 3).

What do 4 and 3 in brackets mean?

Health 4 means that Zhao Xue is in the fourth column, and health 3 means that he is in the third row.

Can Mr Zhao Xue's position be represented by several pairs (3, 4)?

Born not, Zhao Xue's position is in the fourth column and the third row, and the third column and the fourth row is Rebecca.

From the teacher's point of view, the number pairs (3,4) and (4,3) are not only in different order, but also in different positions. Therefore, when we use number pairs to represent positions, we must follow the law. Number pairs: the first number represents the column and the last number represents the row.

Consolidation exercise: Please write down the positions of Sun Fang, Zhou Ming and Li Xiaodong with what you have just learned.

Assign a student to write on the whiteboard.

[5] consolidate the method of determining position

1. Let's talk about which is the first column and which is the first row in our class. Let the students point out their positions in pairs. Ask several students to answer and practice in pairs.

2. The teacher said the number was right, and the students found the corresponding classmates according to the number.

[6] Consolidation and expansion

In teachers' life, there are many cases where two numbers are used to determine the position. Do you know that?/You know what?

Give an example of how to use number pairs to determine the position in life.

The courseware shows 1, and the buttons on the door of the building indicate several floors and numbers.

2. How many rows of seats are there in the cinema?

3. Chessboard

[7] Classroom exercises

1, represented by the number pair (3,2). Can you show the position of several other modes with digital pairs?

Reference answer:

Apples are represented by pairs (4,3); Watermelon is represented by a number pair (2,1); Bananas are represented by number pairs (4,1); Cherry is represented by several pairs (2, 3).

2. The picture below shows chess.

How did she determine the position of the chess piece?

(2) Can you talk about the position of each work like her?

Reference answer: white? Wang? Count e from left to right? Column, from bottom to top? 1? Line, so it is represented as (e, 1) by a number pair.

[8] class summary (PPT projection)

Teachers and students, in this class, we learned the method of determining the position of objects. I believe the students will gain a lot. Who will talk about the harvest?

I learned how to use number pairs to indicate position.

I know that the first number in a number pair represents a column and the second number represents a row.

I know that vertical rows are called columns, generally counting from left to right, and horizontal rows are called rows, generally counting from front to back.

Write on the blackboard.

Chapter II Location Section 1 Determine the location

(Column 2, Line 3) (2, 3)

Digital pair (3, 4)

(4,3)

First column, then row

Vertical rows are called columns, which are generally counted from left to right.

A row is called a row, usually counting from front to back.