1. Let children experience the lightness and heaviness of objects through the activities of watching, weighing and weighing, and gradually deepen their feelings and understanding of lightness and heaviness.

2. Let children realize that there is no necessary connection between the weight of an object and its volume.

3. Improve team cooperation ability and cultivate children's exploration spirit.

Teaching preparation:

Some physical objects. Picture of balance scale

Teaching focus:

Through the child's actual operation, you can tell what kind of object is light and what kind of object is heavy.

Teaching steps:

First, create a situation

Teacher: On Sunday, the zoo is very lively. Let's see, children. The courseware shows the situation map. )

1. What small animals have been to the zoo? What are they doing? Oh, there are horses, elephants, rabbits, bears and monkeys playing on the seesaw! )

Do you know which is lighter or heavier, the bear or the monkey? how do you know

Teacher: In this class, we will learn to compare weights. Show me the topic.

Second, explore new knowledge.

1, have a look and compare.

There are many animals in the zoo. Do you know who is lighter and heavier? How many kinds of animals are shown in the courseware?

(2) How do you know their weight?

2, weigh in your hand and compare.

(1) Math books and pencil boxes. Can you see who is lighter and who is heavier? (You all think you can't see it with your eyes) So, what can you think of to compare them?

(2) children's operation, hand. Now, ask a child to compare the weight of a math book with that of a pencil box, and the weight of other objects you are interested in.

(4) A child said that he repeatedly weighed an apple and a pear, but he didn't know their weights. Think about it, what should you do? By the way, we can weigh it with the help of weighing scale. Now, we use

This scale is for weighing.

3. Weigh and compare.

(1) The teacher demonstrates weighing, and the courseware has pictures of apples and pears. Q: Who is lighter and who is heavier? how do you know (Many students can see that the short side of the apple means that the apple is heavy, and the high side of the pear means that the pear is light. Moreover, some students also found that the pointer of the balance would be biased towards the heavier side, indicating that the students observed it very carefully! )

(2) children operate, weighing objects and weighing. Now you can weigh yourself and compare the weights.

Fourth, summary:

Teacher: Let's review, children. What did we learn in this class? What are the common methods to compare the weight of objects? Under what circumstances and in what way? There are many ways to compare the weight of objects. We can see the weight of an object at a glance, so we can have a look. When we can't see, we can use the method of weighing; When we can't see, we can use the method of weighing.