Teaching plan of "Tons of Understanding", the first volume of mathematics in the third grade of primary school, published by People's Education Press.

# Lesson Plan # Introduction Understanding Tonnage is a concept teaching course, which is taught on the basis that students learn the kilograms and grams of quality units and have a preliminary understanding of quality units. The following content is ready for your reference!

Tisch

Teaching objectives:

1. Let students know the weight unit "ton" and its application in practice, and initially establish the concept of "1 ton", knowing that 1 ton = 1000 kg.

2. Simple conversion between weight units can be performed.

3. Cultivate students' preliminary observation ability, weight estimation ability and reasoning ability, and develop their spatial imagination ability.

Teaching focus:

Establish the concept of weight unit "ton".

Teaching methods: demonstration, teaching and communication.

Teaching process:

First, review the old knowledge.

What units of weight have the students learned? Describe the weight of 1g and 1kg in detail. (You can give an example)

A basket of apples weighs about 20 (). Xiaolan weighs about 25 ().

An egg weighs about 50 (), and a big truck can hold about 8 ().

It is difficult for students to fill in the last question. If a classmate says "tons" as the unit, ask him how he knows. If he can't say it, don't ask in detail. The teacher will introduce a new lesson. )

The truck has a heavy load, so it is not appropriate to use kilograms as the unit in the above question. In this lesson, we will know a new member of the family of weight units-tons. (Title on the blackboard: Understanding of Tons)

Interactive cooperation

Second, the preliminary understanding of "ton"

What do you mean by tons? How much does it weigh?

Show the items weighing about 1 ton step by step, so that students can get a preliminary understanding of the weight of 1 ton from the comparison of common items.

How much is 1 ton? In fact, 1 ton = 1000 kg, and tons are represented by "t".

Blackboard: 1t= 1000kg, 1t = 1000kg.

Today, the students brought many objects with known weights. Please introduce them to us. Did any students bring tons of things? Explain why.

In your life, you must have seen something that can be measured by tons. Can you say it briefly? Students give examples

Please look at these objects and the objects you know carefully. Do they have anything in common? After discussion, the students come to the conclusion that the object in tons is both big and heavy. Usually, the weight of heavy or bulk goods is measured in tons.

After learning about Ton, the teacher has some items here. Please choose a suitable unit for them.

Example: Ask the students to name an object that weighs about 1 ton.

3. Conversion between kilograms and tons.

1. Demonstration: 3 tons = () kg 8000 kg = () tons.

Please answer any questions and say what they think.

2. The teacher emphasized that because 1 ton is 1000 kg, 3 tons is 3 pieces 1000 kg, and 3 pieces 1000 kg is 3000 kg, so 3 tons = 3000 kg. Because 1000 kg is 1 ton, there are 8 1000 kg in 8000 kg, so 8000 kg is 8 tons.

3. Show me the photos of the elevator, with a weight limit of 1 ton and thirteen adults. Show me the problem.

A. If I am a child, how many people can I bring?

B. If the whole class has to take the elevator, how many times at least? (according to class size)

Display communication

Transportation of building materials by trucks with a load of 6 tons is as follows.

How to transport to minimize the number of transport? Work in groups to see which group of students designed the plan.

All kinds of cement, yellow sand, stones, bricks and steel.

Weight 2500 kg, 4 tons, 6 tons, 9 tons, 2500 kg.

Fourth, consolidate and expand.

1. What did you learn in this class? What skills have you learned?

2. Discussion: Is it correct to say that the propulsion rate between every two weight units is 1000?

Clear: the difference between "every two adjacent weight units" and "every two weight units". Make students clearly understand that there are two basic ratio relationships between weight units, namely, L ton = 1000 kg and L kg = 1000 g. There is an extended relationship, namely, 1 ton = 1000000 g.

Verb (abbreviation for verb) assigns homework.

Exercise 3: 2.3

Blackboard design:

Understanding of tons

1t = 1000kg 1t = 1000kg。

3 tons = () kg 8000 kg = () tons

extreme

First, the teaching objectives

(1) knowledge and skills

With the help of concrete objects in life, we can know the application of mass unit ton and perception 1 ton in life.

(2) Process and method

Knowing the relationship between quality units, 1 ton = 1000 kg, you can perform simple unit conversion.

(3) Emotional attitudes and values

Through observation, guessing, reasoning, induction and other mathematical activities, I experienced the formation process of the concept of tonnage and felt the close connection between mathematics and life.

Second, the target analysis

The understanding of tons is based on students' understanding of kilograms and grams, and they have certain life experience and calculation ability. According to students' cognitive characteristics, make full use of visual materials in teaching and help students understand the meaning of 1 ton in connection with real life. Ton is an abstract quality unit, and students often can't feel it directly because they don't have much contact in their daily life. Therefore, various activities are organized in teaching to help students experience and feel 1 ton. Provide more life materials, guide students to use various reasoning methods to perceive the weight of 1 ton, and deepen their understanding of 1 ton = 1000 kg. The conversion between tons and kilograms of teaching quality allows students to reason according to the ratio relationship between tons and kilograms, shows students' thinking process and cultivates students' logical reasoning ability.

Third, teaching focuses on difficulties.

Teaching focus:

Establish the quality concept of tons, skillfully use 1 ton = 1000 kg, and correctly convert the units between tons and kilograms.

Teaching difficulties:

Establish the quality concept of tons.

Fourth, teaching preparation.

Courseware, 10 kg 1 bag of rice, 1 bucket of water, 1 bundle of books prepared by students themselves, etc.

Teaching process of verbs (abbreviation of verb)

(a) Creating an environment and introducing new knowledge

Do children like going to the zoo? What animals do you like? Let's see how heavy these animals are. (The courseware shows the following animal pictures.)

A parrot weighs about 35 ().

A rabbit weighs about 3 ().

A Siberian tiger weighs about 350 ().

An elephant weighs about 5 pounds.

Why do parrots, rabbits and Siberian tigers choose grams or kilograms as units? Tell me what you think.

Is it appropriate to use "gram" or "kilogram" as the unit of elephant weight here?

The quality of elephants should be measured in tons. Do you know what other objects in life are measured in tons? Give examples. The courseware shows the corresponding pictures.

The quality of heavy objects or bulk goods is usually measured in tons, which can be represented by the symbol "T". In this lesson today, we will learn this new quality unit-ton (blackboard writing: understanding of ton).

The design intention is to create problem situations with the help of familiar animals that students like, to stimulate students' interest, and to help students recall the mass units grams and kilograms they have learned. Next, when it is appropriate to express the mass of heavier objects in kilograms, it will cause the conflict of students' existing cognition, and create the need to express it in a new mass unit, resulting in the mass unit "ton".

(2) Activity experience and the construction of new knowledge

1. A preliminary understanding of the weight of 1 ton

(1) Thinking: How much does 1 ton weigh? What's the relationship between tons and kilograms?

(2) Guide students to observe 10 bags of rice, each bag weighs 100 kg, and two bags weigh 200 kg. ...

10 bag is 1000 kg, which means 1 ton. 1 ton = 1000 kg.

(3) (Showing pictures) One polar bear weighs about 500 kilograms, and two polar bears weigh about () kilograms, which is () tons.

The design intention is to help students understand the meaning of 1 ton with intuitive living materials, and let students know that tons are indeed much larger than kilograms.

3. How heavy is the activity experience of1ton?

(1) * * Experience1ton weight.

Each group prepares a bag of 10 kg of rice, each person holds the weight of 10 kg, and then cooperates to feel the weight of 20 kg and 30 kg, instructing students to calculate how many bags there are in 1 ton. (courseware demonstration 100 bag is 1 ton)

(2) Work in groups and feel the weight of 1 ton.

Each group can prepare a bucket of water, a bundle of books, a classmate's weight and other different items.

(2) Each student personally hugs, lifts and backs.

(3) Through calculation and estimation, how many identical articles have a mass of 1 ton.

④ Report the results in groups.

(3) Do the second question on page 32 of the textbook.

Guide students to draw conclusions through calculation. For example, 500 kg+500 kg for two cows = 1 000 kg, which is1ton. Two bags of cement are 1000 kg, and 20 bags are 1 000 kg, which is1ton.

The design is intended to be experienced by the whole class first, so that students can personally feel the weight of 1 ton, which will play a guiding and demonstration role for the later group experience. The following experience materials are divided into groups, so that students can choose familiar items independently. Through group cooperation and communication activities, students can experience the process of operation, calculation, communication and imagination, further strengthen their understanding of 1 ton, and form the quality concept of 1 ton.

3. Conversion between tons and kilograms

(1) courseware gives example 8.

4 tons = () kg 3000 kg = () tons

(2) Students fill in the blanks by thinking independently.

(3) After intra-group communication, report the transformation reasoning process.

(4) Complete page 32 of the textbook and do it.

An elephant weighs 6000 kilograms, which is equivalent to 6 tons. The weight of a truck is 5 tons, which is (5000) kilograms.

The unit conversion of tons and kilograms is the same as "kilometers and meters", which is not difficult, and students can do it independently.

(3) Strengthen practice and consolidate improvement.

(1) Title 1 on page 34 of the textbook.

This is a related problem, and through practice, students can further deepen their feelings about the two quality units of kilograms and tons. Students connect independently first, and then communicate collectively.

(2) Question 2 on page 34 of the textbook.

Let students practice independently first, and then exchange feedback. Let the students say what they think.

(3) Question 3 on page 34 of the textbook.

Students perform unit conversion and simple calculation according to the relationship between tons and kilograms, and unify the units before calculation.

(4) Question 4 on page 34 of the textbook.

Guide the students to find that the machine with 1000 kg is already 1 ton, and the mass of the machine with it cannot exceed 1 ton. Encourage students to express different ideas and understand the diversity of problem solving in communication.

The design intention is to enable students to further master the conversion and simple calculation methods of tons and kilograms through diversified exercises, further establish the quality concept of tons, and solve the corresponding problems of relevant quality units in real life.

(4) Summary, expansion and extension

1. What did we learn today? What did you get?

2. Question 5 on page 34 of the textbook.

Find out how many tons of water your family uses every month. Do you think it's ok to use less 1 ton of water every month? Discuss with mom and dad what water saving methods can be used.

The design intention is to further review and reflect on the knowledge learned in this class through the summary of the students in the class. Using tons of knowledge in mathematics practice, the acquisition of knowledge extends from class to extracurricular, so that students can feel the close relationship between mathematics and life.

Tisso

First, the teaching objectives:

1, so that students can understand the mass unit ton, initially establish the concept of 1 ton, and know that 1 ton is 1000 kg, which can simplify the aggregation of mass units.

2. Cultivating students' ability to estimate the quality of objects can solve some corresponding problems in real life.

Second, the focus and difficulty of teaching:

The concept of 1 ton was initially established.

Third, the teaching process

(A) the creation of situations, the introduction of new courses

1, (exhibition site) fruit trading market, boxed and bagged fruits, one apple weighs 200 ()

A box of apples weighs 15 () (fill in the appropriate company names respectively) (a big truck full of apples) Let the students estimate the weight of apples in this car.

(e.g. 3 tons)

2. Let the students talk about their understanding of "tons" (and reveal the topic: "Understanding of tons")

(B), understanding the "ton" in practical experience

1, intuitive perception, a preliminary understanding of "tons"

(1) Please find out if there are any objects in the classroom that can be measured in tons.

What are the suitable units, such as desks, chairs, televisions and books? )

(2) So which objects are measured in tons?

(Please give an example)

(3) Media presentation: For the bearing capacity of elephants, cars (ships) and a large number of stones on the construction site, it is more appropriate to use "tons" as the unit.

2, know tons

(1) Ask four students to stand together and let them talk about their weight.

A. What are the weights of the four junior three students (about 100 kg)?

B, how many kilograms do eight such students weigh?

How many kilograms do students like C, C and 40 weigh?

(2) In order to simply measure 1000 kg, it is specified as 1 ton.

Contact 40 students in the class and imagine the weight of one ton.

(3) Media presentation: Take a look and calculate.

A, a bag of rice weighs 100 Jin, and several bags of rice weigh 1 ton.

B, b, 100 The weight of the brick is 200 kilograms. How many bricks weigh about 1 ton?

(4) Think and fill in (group cooperation)

The weight of a box of apples is 10 kg, a pair of dumbbells is 5 kg, a bag of flour is 25 kg, and 1 cow is 500 kg, so the weight of () is 1 ton.

(5) Talk about where to use "tons" as the unit according to real life.

(6) Fill in the appropriate weight unit.

Answer: The truck load is 4 ()

B: Xiaoming weighs 35 pounds.

The weight of an eraser is 8 ()

D: Zhejiang weightlifters won the championship again with the clean and jerk 207.5 () at the 2XX Olympic Games, winning glory for their country. Let the students think about how many students he can hold, and how many Zhan Xugang can hold in one ton.

The dead weight of the bridge is 10 () (please tell the students what is the dead weight of the bridge).

(3): Chemical polymerization of tons and kilograms.

1, please try Example 3.

(1)5 tons = () kg (2)2450 kg = () tons () kg.

Fill in the blanks and point out the students' ideas.

2. Give it a try

8000 kg = () ton 6 ton 20 kg = () kg

(D), class summary

What units of weight have you learned? What is the relationship between them?

(5) Practice

1, fill in the blanks

4000 kg = () tons 3 tons = () kg

2 tons 600 kg = () kg

4200 kg = () tons () kg

7 tons 38 kg = () kg

An elephant weighs 5000 kilograms. How many tons does it have?

(2) A truck can hold 4 tons of 500 kilograms of rice. How many kilograms?

③ The weight of an ostrich egg is1500g, which is how many kilograms and grams.