1. Guide children to explore with their hands and brains to find the center of pictures and some items, so as to understand the principle that some items have a center.

2. Stimulate children's interest in exploring mathematics activities through activities and actively participate in them.

Prepare rope, round paper, square paper, etc.

Activity process

First, arouse children's interest and lead to the topic

1. Show a rope and let the children find its center.

2. Teacher's summary: The children came up with a quick and good way to find the center of this rope accurately.

Second, children's operation explores the center of the circle

1. The teacher prepared a round piece of paper for each child. Please find out where the center of the circle is.

2. Children use their hands and brains to explore, find the center of the circle, and point with a pen.

Teachers' itinerant guidance, inspection and individual counseling.

3. Ask children to introduce the operation process and results.

How did you find the center? Where is the center of your circle?

4. Teacher's summary: the methods and results of children's operation exploration, the selected operation methods and the most accurate operation results.

5. Let the children try again: learn to operate in the same way.

Third, children operate and explore to find the center of the square.

1. Let children use their hands and brains to explore the center of the square.

2. Children explore with their hands and brains, find the center of the square, and click with a pen. Teachers' itinerant guidance, inspection and individual counseling.

3. Ask children to introduce the operation process and results.

How did you find the center? Where is the center of your square?

4. Summary: Edge-to-edge and corner-to-edge are folded in half, and the intersection of the two lines is its center point.

Fourth, children explore to find the center of the circular queue.

Display: A square with nine disks.

Just now we found the center point by folding in half. Now these nine disks are arranged in a square and cannot be folded. So, where is its center?

1. Let children think and tell the location of the central point, and give the reasons.

On the center of the circle in the middle, the intersection of the horizontal center line and the vertical center line is their center point.

2. Display: A rectangle with eight disks arranged. So, where is its center?

3. Let the children use their brains to tell the location of the central point and give reasons.

The intersection of two center lines is their center point.

Five, other projects of children's operation inquiry center

1. So, do you know where the center of our table is?

2. Let the children cooperate with their peers to explore and measure the center of the table.

3. Let the children introduce the manipulation process and results of cooperation with peers.