moving target

1, learn to measure the area and compare the size of the area by graphic method.

2. Cultivate children to actively explore and try, and give play to their creative thinking.

3. Cultivate children's patience and meticulous quality.

Activities to be prepared

1, two copies of homework sheets with coordinate points and gardens painted on them; Pencils and erasers are one for each person.

2. Several square figures; Several small animals

Activity process

First, lead to the topic

Teacher: Look who this is, children. (Show it to the pig)

Piggy built a big garden on this land.

The teacher will come back as a designer to help the pigs make this garden more beautiful.

Second, learning activities.

Teacher: The garden is paved. Is it beautiful? So how big is this garden?

How many squares are there in this garden?

1, child counting grid (default)

2. The teacher and the children count together (the teacher writes it down one by one)

3. Teacher: What method is not easy to make mistakes?

Summary: This garden is as big as 18 square.

Third, guide practice.

Teacher: How do we know the size of the garden? (counting squares)

But isn't it too much trouble to put them on one by one and take them off one by one?

Is there any other simpler and more convenient way?

The teacher brought you a garden of chickens, rabbits, monkeys and sheep. Let's try to figure out how big their garden is.

3. Children try.

By trying, in your own way, what is the area of the garden? And record the result in ().

4. Discussion and communication

How big is your garden? Do you know any good methods?

(2) What methods do we use to avoid making mistakes?

(3) Who do you think is the best way? (Marking and numbering)

5. Try again:

When counting, use the method of marking or numbering to get the size of the garden accurately.

6. Summary: It turns out that although their gardens are different in shape, they are all the same in size.

Fourth, compare sizes.

1, Teacher: Rabbit and Rooster saw that all the small animals designed gardens of the same size and modified their own gardens.

It is also covered with beautiful colors. do you want to see it ?

The teacher shows two gardens with the same number of triangles but different numbers of squares. )

But they quarreled in www.qinzibuy.com. The rabbit said, "My garden is very big." The little cock said, "My garden is very big!" " "

Children, let's help them. Which of them has the bigger garden?

2. What's the difference between these two gardens? (more triangles)

3. What method should we use?

(Count the number of squares and triangles respectively and fill in the corresponding ().

Children guess whose area is big.

5. Teachers verify the results. The teacher took down the squares and triangles and compared them in two rows.

It is concluded that the rooster's garden is bigger than the rabbit's garden.

6. Mark a ○ represents the rooster's garden, and mark a ○ represents the rabbit's garden.

V. Children's exercises

(Guide children to calculate the garden area with different numbers of squares and triangles)

1, Teacher: Little Rooster was not convinced when he heard the news. He quietly added two triangles to his garden.

It thinks: the rabbit only has one more square than me. Now I have two more triangles than you. This time my garden must be bigger than the rabbit's!

Children, is the rooster's garden really bigger than the rabbit's? Please think about it quickly.

2. Wait for the child to sit down and practice before guessing the size.

3. The teacher drew a conclusion.

(Guide the children to the conclusion that the size of two triangles is equal to the size of a square)

4. Add a pentagram to the rabbit.