I. Overview:

"Volume and unit of volume" is taught on the basis of students' understanding of cuboids and cubes and the further development of the concept of space. This lesson mainly adopts the form of group activities to teach the meaning of volume and unit of volume. Firstly, teachers help students to establish the concept of volume through experiments, so that students can understand the meaning of volume and further establish the concept of space. Then, through observation and perception, let students establish the commonly used concept of unit of volume, know the commonly used unit of volume [cubic meter, cubic decimeter, cubic centimeter], and establish the concept of unit volume. Finally, let students know from the teaching activities that measuring the volume of an object is to see how many unit of volume it contains.

Two: Speaking of teaching materials

1, Content: The content of this lesson "Volume and Unit of Volume" is taught on the basis of students' understanding of cuboids and cubes and the further development of the concept of space. The main content is the teaching volume and the meaning of unit of volume. The textbook first helps students to establish the concept of volume through experiments, and then establishes the common units of volume concept through observation and perception. Finally, the textbook explains that measuring the volume of an object is to see how many unit of volume it contains.

2. Objective: Through the teaching of volume and unit of volume, (1) let students understand the meaning of volume and further establish the concept of space. (2) Make students know the commonly used unit of volume [cubic meter, cubic decimeter, cubic centimeter] and establish the concept of unit volume size. (3) Know that measuring the volume of an object depends on how many unit of volume it contains.

3. Teaching emphasis: master the knowledge of volume and unit of volume, and cultivate students' practical ability.

4. Difficulties in teaching: Establish the spatial concepts of 1 cubic centimeter' 1 cubic decimeter and 1 cubic meter.

5. Teaching preparation: beaker, stone, unit of volume, courseware.

Third, teaching strategies:

1. Stimulate students' interest in learning by introducing stories.

2. Use the methods of experiment and self-study to develop students' practical ability and autonomous learning ability.

3. Cultivate students' cooperative ability by group learning.

4. Cultivate students' innovative ability by students' hands-on experiments.

Fourth, the teaching process:

(1) Import:

1. Listen to the story of a crow drinking water.

2. Exposure topic: Teacher: Do you know how crows drink water? What does this mean? This is the new topic we are going to study today, "volume and unit of volume". (Show the topic)

(2) Explore new knowledge

1. Establish the concept of "quantity".

The teacher showed the first experiment, "What did you find when you put a small stone in a beaker filled with water? Explain what? " Please read the questions and work in groups.

Teacher: What did you find through this experiment? Why? [Description: Objects occupy space] {blackboard writing}.

The teacher demonstrated the second experiment again. "Put two stones with different sizes into two beakers with the same water height. What do you find?" Explain what? "Please read the questions and work in groups.

Teacher: Through this experiment,

What did you find? Do they rise to the same height? What does this mean? Large objects take up more space, while small objects take up less space. 【 Description 】 Through two experiments, students' group learning and cooperation ability were cultivated, and their hands-on operation ability was trained. ] Physical demonstration: eraser, pencil case, schoolbag.

Teacher: Which of these three objects takes up more space? Which one takes up less space?

Who takes up more space than a desk?

Guide students to draw the conclusion that the space occupied by objects is "size: {blackboard writing}".

The definition of volume is summarized as follows: "The size of the space occupied by an object is called the volume of the object." write on the blackboard

Read all the students.

Teacher: Which of the three objects on the desk is the biggest? Which is the smallest? Do you know anything bigger than a schoolbag? Do you know anything smaller than a matchbox? Description: The meaning of volume is abstract, which is difficult for students to understand. The first experiment here allows students to "occupy space" by observing, thinking and understanding objects. Through the second experiment, let students form a vivid representation of "space has size" and help them understand the meaning of volume, which is conducive to the establishment of the concept of "volume". ]

2. Teach "units of volume".

Please show me this picture, teacher. Who is older than you? [Description: The teacher compares the sizes of two cuboids, and the students find it difficult, thus pointing out that the unified unit of volume should be used to measure the volume of objects. Thereby introducing the teaching of "unit of volume"]

Teacher: In order to compare the sizes of these two cuboids in the picture more accurately, we can cut them into cubes with the same size. Just count how many small cubes each cuboid contains, and we can accurately compare their sizes.

Please count and tell the teacher who is older.

Student report (pay attention to the way to get students to say numbers).

Teacher: For example, measuring length requires length unit, measuring area requires area unit, and we also need "unit of volume" for measuring volume. In order to measure the volume of an object more accurately, we can use a cube with the same size as unit of volume as shown in the figure.

Please read the commonly used unit of volume.

Show self-study requirements "v self-study text 15 pages.

Teach yourself unit of volume. Take a look (what shape it is), measure (how long its side is), touch (how big it is), say (its definition) and find out (what objects in daily life can be measured by this unit of volume). Discuss and communicate in groups. "

Let the students teach themselves "unit of volume" in groups, and discuss and communicate. Students report their self-study results on the stage. [Description: Teachers show the self-study outline, let students discuss and communicate in the form of group self-study, and let students show their self-study achievements, which greatly exerts students' subjective consciousness and inquiry learning ability, and develops students' cooperation ability. ]

Teacher (Summary) Through the above study, we know that the commonly used unit of volume has cubic centimeters, cubic decimeters and cubic meters. And know how big 1 cubic centimeter, 1 cubic decimeter, 1 cubic meter is?

In the future, when we measure the volume of an object, we should choose the appropriate unit of volume according to the actual situation.

3. Teach the method of "measuring unit of volume".

Show me the map. Teacher: It is known that the side length of each cube is 1 cm. What is its volume? How many small cubes does this cuboid consist of? How many cubic centimeters is it? What is its volume?

Please tell me.

Teacher (Summary) Measuring the volume of an object depends on how many unit of volume it contains.

Student operation:

Please use four small cubes of 1 cubic centimeter to make different cuboids. What are their volumes? Can you make it into other shapes? What are their volumes? [Note: The operation here has two functions: one is to know how to measure the volume of an object, depending on how many units it contains; Second, you can look at the volume by putting a small cube to prepare for the calculation of the volume later. ]

4. Feedback

Which is the unit of length, which is the unit of area and which is unit of volume? What's the difference between them?

(Exercise assignments in the textbook) [Note: By comparison, it helps students to strengthen their understanding of length, area and volume measurement units and better construct their cognitive structure]

Three: the application of knowledge.

(4), class summary:

Teacher: What have you gained from studying this course? Seven, blackboard design:

Volume and unit of volume

The size of the space occupied by an object is called its volume.

Unit of volume: Cubic centimeter: The volume of a cube with a length of 1 cm is 1 cm.

Cubic decimeter: the side length is 1 cubic decimeter, and the cube volume is 1 cubic decimeter.

Cubic meter: the side length is 1 cubic meter, and the cube volume is 1 cubic meter.