Textbook page 2 1 ~22 "How much is 1 ton" and "Practice"

Teaching objectives:

Knowledge goal: 1, feel and know the quality unit ton according to the specific living conditions, and know the actual quality of 1 ton.

2. Master "1t = 1000kg" and make a simple conversion.

Process objective: to improve students' ability to estimate the quality of objects in practical operation in combination with specific conditions.

Emotional goal: Infiltrate the idea that mathematics knowledge comes from life practice, feel the connection between mathematics and real life, and feel happy in learning activities.

Teaching focus:

Know "ton" and master "1 ton = 1000 kg".

Teaching difficulties:

Understand and clarify the practical meaning of "ton".

Prepare teaching tools:

Computer courseware

Teaching and learning process

First, create situations and ask questions.

Teaching material content

Teachers' activities

Student activities

Show courseware:

What happened in the forest?

Let's see what they are saying.

What do you want to say after listening to their conversation?

Let's learn about "1 ton"

The title on the blackboard is "How heavy is 1 ton"

Observe and express personal opinions.

Ask questions you want to understand.

Second, cooperation and exchanges, * * * with exploration.

Teaching material content

Teachers' activities

Student activities

Solve the questions raised by the students one by one.

1, how much do you think 1 ton is?

(1) The computer will show the situation one by one, so that students can have a look, do the calculation and say it again.

(2) What did you learn from your study?

(3) Think about it: 1 ton, how much of this mass is there?

The mass of a box of apples is 10 kg. The mass of a pair of dumbbells is 5 kilograms. The mass of a bag of rice is 100 kg. The mass of a cow is 500 kilograms.

Please cooperate with each group to complete. The recorder takes notes.

Now do you know which objects have a mass of 1 ton? Please close your eyes and think about it.

2. Explore the relationship between tons, kilograms and grams and make a simple conversion.

(1) What mass units do you know?

Can you arrange these mass units in a certain order?

(3) Do you know the propulsion rate between every two mass units?

Do you know which letter "ton" can stand for?

5] Can you fill in the following questions?

4 tons = () kg

6000kg = ( )t

8 kg = () grams

15t= () kg

3. Under what circumstances should tons be used as the unit of measurement?

(1) Students, have you ever observed the example of using tons as the unit of measurement in your life?

Let's look at these examples in life. Show the pictures in the textbook one by one and guide the students to understand the pictures.

Students perceive the weight of 1 ton by observing, estimating and talking to each other.

Students are free to choose to think independently first and then cooperate in groups.

Students close their eyes.

After the students talk to each other, answer separately.

Students do it independently.

Students speak individually.

Students look at the pictures and say what they mean.

Third, consolidate practice and improve ability.

Teaching material content

Teachers' activities

Student activities

Exercise 1, 2, 3 and the math story on page 22 of the textbook.

1, Scampy wants to ask his classmates to help him solve some problems, will you?

(1) Show the second question.

(2) Show the third question.

2. "Cao Chong is an elephant"

Let the students tell stories according to the pictures.

According to the records, do you know how much the elephant weighs?

The group calculated the weight of the elephant together.

3. What have you gained from learning this lesson? Happy! Anything else you want to know? We can continue to study in the next class.

After the students finish their homework independently, the whole class communicates and then talks about their own thinking methods separately.

After the students fill it out independently, talk about their ideas at the same table, and then communicate with the whole class.

Students tell the story "Cao Chong is an elephant".

Students exchange views.

The students calculated the weight of the elephant according to the records.

Students talk about ideas with each other.