1, so that students can get to know a fraction and use the fraction correctly to represent a part of an object.

2. Cultivate students' observation ability, hands-on operation ability and oral expression ability.

3. Stimulate students' interest in learning mathematics, so that they can gradually develop the habit of observing and thinking about problems from a mathematical point of view.

Emphasis and difficulty in teaching: knowing a score and feeling the formation process of a score of new knowledge.

Teaching aid preparation: square paper and round paper, multimedia courseware.

Instructional design concept: The preliminary understanding of fractions is an extension of mathematical concept teaching, which will be difficult for students to understand and master, so the content appearing in this book is the most preliminary. Therefore, in learning, we should create concrete and vivid problem situations, activate existing life experiences, and use intuitive means such as experimental operation, observation and judgment to gradually make students understand the basic meaning of some simple fractions, establish the initial concept of fractions for students, learn to express and communicate with simple fractions initially, and further develop the sense of numbers, paving the way for learning decimals and further learning fractions.

First, story introduction.

1. Students, do you know where Four Great Classical Novels is in China literature? Then which famous book do you like best? Today, the teacher brought you a story about Journey to the West, but some math problems were hidden in the story. Please read and listen carefully. (The teacher shows the courseware while talking. )

2. It is said that Tang Priest and his disciples went to the Western Heaven to learn Buddhist scriptures. One day, they passed by Taoyuan and stopped to have a rest. When the Monkey King and Pig Bajie saw the big, red peach, their mouths watered. The master said, "You can eat peaches, but I have to test you first." Wukong and Bajie nodded again and again: "Good! Ok! "

The master said, "there are four peaches, and you two share them equally." How many peaches does everyone get? " ? Please write down this number. "Who will help them? Student: Two each. An average score means that you two have to share as much. How is your figure? Health: 2 inches

The master then said, "If you divide two peaches equally, how much will everyone get?" ? Health: 1. Then use the number "1".

The master said unhurriedly, "If you give 1 peach to both of you, how much will each person get?" Pig quickly said, "Half! Half! " "But how can half of it be represented by a number?" Brothers, you look at me, I look at you, at a loss.

3. Introduction: Students, how to express the result of "half a peach"? This is the new friend we are going to meet today-score. Fraction is a big family in the kingdom of mathematics. Today, let's get to know one kind of members in this big family-for a second, and explore new knowledge.

(a) understanding 1/2 (courseware a peach)

Teacher: How do Bajie and Wukong share a peach? Please take out the peaches in your hand and share them. How do Bajie and Wukong divide? Divide the points between groups and tell your team members how you divide them. (discussion)

Student: Average score. Yes, only the average score is fair. Remember, you must get an average score.

This peach should be divided into two parts equally. How much should everyone get? Raw (half) is one of them. (Pointer) This is peach's 1/2, and this is peach's 1/2, which means each one is peach's 1/2.

Teacher's summary: The courseware divides a peach into two parts on average, and each part is half of it.

1/2 We talked for a long time, so how should we write 1/2? Please write a horizontal line in the middle first. Note that this line should be straight, indicating the average score. Write 2 copies under the horizontal line, and write 1 on the horizontal line. When writing, the numbers above and below the horizontal line should be aligned. (blackboard: 1/2)

So how do you read it? (Teacher writes on the blackboard: 1/2)

Exercise 1

(1) Physical exercises are divided into eraser, ruler and bread (average score).

Summary: Only when the object is divided into two parts, one part can be represented by 1/2, and the shaded part in the figure below can be represented by 1/2. Why? (Courseware demonstration)

(2) Understand 1/4. (The teacher has a peach in his hand)

Just now we gave Bajie and Wukong an equal peach, but there were also Master and Friar Sand. Now we are going to divide this peach among the four of them equally. How should I divide it? Health: (Divide this peach into four parts equally, and each person will get 65438+ 0/4 of this peach)

We know 1/2 and 1/4. Let's look at two sets of pictures.

Exercise 2

1) Create a score.

Teacher: We just met 1/2 and 1/4. How much do you want to know?

Display of works with different scores.

Teacher: The students have said so many grades, so now, you can use the square paper we prepared to fold out the grades you want to know, and then color it to indicate your selected grades. Feedback: How did you fold the student's presentation on the stage? write a musical composition

Abstract:.

(3) The comparison molecule is the fraction of 1.

We know so many scores, so who is older and who is younger? (Look at the blackboard)

1. Grouping comparison 2. Inverted numerical sequence comparison 3. Sit than.

Teacher: Have you found any rules through the comparison just now? Sit down and discuss it together.

Use the found rules to compare the scores of the following groups.

Exercise 3 Solving Real Life Problems:

There are math problems everywhere in life. Let's use what we have just learned to solve some problems in life.

The courseware shows the problems in life.

Verb (short for verb) The end of the story.

In this lesson, we learned a part of the score. Now let's go back and help Pig. What size is his half peach? ( 1/2)

In fact, the score is all around us. As long as you observe with your heart, feel with your heart, and look at the world with a mathematical eye, you will become smarter and smarter! In the future study, we will continue to approach the music score, understand the music score and uncover more mysteries of the music score.