1. Let children learn more important methods and learn to record initially through the activities of finding, weighing and weighing.

2. Let children realize that the weight of an object is not necessarily related to its size.

3. Cultivate children's observation ability and hands-on ability, improve team cooperation ability and cultivate the spirit of exploration.

Activity preparation:

1, animal background map: a meadow; Animal pictures: horses, elephants, rabbits, puppies, mice, seesaws; There are several arrows.

2. Physical objects: teaching books, pencil boxes and other light and heavy foods.

3. Apples and pears with similar weights; Weigh a homemade balance, an apple, a pear and an orange.

4, every two children a homemade balance, a small basket (pen, paper, some records, glass beads, wooden beads, plastic, etc. ) pens, etc.

Activity flow:

First, create a situational teacher:

Teacher: On Sunday, the grassland is very lively. Let's see, children. (The picture shows the situation. )

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? In this lesson, we will learn to compare weights. Show me the topic.

Second, explore new knowledge.

1, take a look, guess and compare:

Teacher: (1) There are so many animals on the grass. Do you know who is lighter and heavier?

(2) How to mark the weight? (arrow)

2. Comparison: Show all kinds of toys and materials, and let the children compare their weights in various ways in groups.

(1) Math books and pencil boxes. Can you see who is lighter or heavier?

(You all think you can't see with your eyes)

So, what can you think of to compare them?

(2) Teacher: Now, ask a child to compare the weight of a math book and a pencil box. Teacher, there are many things here. How do you tell them apart? (End to end, mention, weigh)

(3) 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, let's weigh it with a balance.

4. Weigh and compare.

(1) (The teacher demonstrates apples and pears) Teacher: Who is lighter or heavier? how do you know (Many students watch.

It's out. The side where the apples are placed is short, which means that the apples are hanging down again, and the side where the pears are placed is high, which means that the pears are slightly tilted.

(This side is vertical and this side is upturned)

5, children's first group operation activities-compare the weight of two objects.

(1) "If you want to compare the weights of objects accurately, you can also use the weighing method. Please take two things out of the basket in pairs and operate them in turn.