1, the significance of quadrupling children: after quadrupling, each share is the same size, so we can compare the relationship between the whole and the parts.

2. Explore the quartering of different objects and materials, develop children's ability to observe and try, and improve their ability to solve practical problems.

Activity preparation:

1. The walls around the activity room are lined with houses with small animals.

2. Each group has two small baskets (one basket contains a number of rectangular, round and oval colored papers, and the other basket contains scissors, pencils, lines, rulers and other tools), and a number of square papers are placed on the table.

3. Prepare a basket of special materials for each group, such as sawdust, soap, cloth, ribbon, plasticine, etc.

4. Paste, several rags and a magnetic blackboard.

Activity flow:

First, let children help small animals and arouse children's interest.

Teacher: Children, are you happy that we came to the Animal City today? The little animals want to ask our children a favor today and put up enough paper for the beautiful house they just built. Because the window paper I bought from the store was too big, I couldn't use it until I whispered that each piece was divided into four parts in a toothpaste, and no small animals could divide it. Are children willing to help small animals?

Second, the first attempt: quartering

1. The teacher tried to divide the square into four equal parts.

Teacher: Now, would you please have a try and see how to divide the square enough paper into four parts of the same size?

2, children try to operate, the box is divided into four parts, teachers patrol to observe the operation of children, give timely praise to children who have achieved good results, and encourage children to think about how many points there are.

3. Ask questions after the trial operation.

Teacher: (1) Please tell xx children how you divide it. How do you know if these four copies are the same size? (Comparison by overlapping method)

(2) Which children have something in common with him? Which children are different from him?

4. The teacher showed the children the three divisions of a square on the magnetic board, and then asked the children to compare the relationship between the whole and the part.

5. summary.

Teacher: dividing a thing into four equal parts like this is called quartering. After quartering, each part is the same size, each part is smaller than the original whole, and the whole is larger than each part.

Third, the second attempt: quartering other figures (rectangle, circle, ellipse, etc. )

1. Let the children put enough paper on the small animals, and the teacher makes a second attempt: divide other graphics into four parts.

Teacher: It's clever of the children to think of so many ways to divide the square into four parts, but the windows of small animals are of various shapes. Let's try, divide the enough paper of other shapes into four parts, and then help the small animals stick it up, shall we? Please gently open the towel, which contains enough paper of other shapes.

2. The child tries the second operation. They divided rectangles, circles and ellipses into four parts. The teacher observed the child's operation and learned different ways to divide the child into four parts.

3. The teacher asked the children who divided different graphs into four parts to talk about what graphs they divided and how. Then the teacher took out the method of dividing all kinds of graphics into four parts on the magnetic blackboard.

Teacher: Now the house of small animals is more beautiful than before. Let's have a look. Is this beautiful window paper posted by a child named Ma? Please tell us, what diagram do you use to divide it? How is it divided?

Fourthly, the teacher put forward a further attempt for the children, that is, dividing different materials and articles into four parts.

1, please help the small animals solve the problem again, that is, divide different materials and articles into four parts.

Teacher: Just now, our children helped small animals divide enough paper into four parts and put it on small animals, but sometimes small animals have to divide other materials and articles into four parts. They don't know what to do. Are children still willing to help them? (The teacher takes out special materials) Here are the problems that small animals usually encounter. Let's try again and help small animals think about quartering, shall we?

2. The children try to divide the special materials into four parts, and the teachers patrol to give timely affirmation and praise to the divided children.

Please choose children with different materials and articles and talk about what they hold and how to divide them.

4. Teacher's summary: Folding the ribbon and cloth can be divided into four parts; Wood chips and soap can be measured with a line or ruler to find the midpoint of each side, and then the centers of the opposite sides are connected with a ruler and pencil and divided into four parts; Plasticine can be first rubbed into a uniform cube, cuboid or sphere, and then divided into four parts.

5. Let the children find out what else around them can be divided into four parts, and tell the small animals all the ways to divide into four parts.

Teacher: The children are amazing. They not only put up enough paper for small animals, but also thought of many ways to divide them into four parts and put so many materials and articles. The little animals must be very happy to know. Now let's go outside and find out what else can be divided into four parts, then figure out how to divide it, and then tell the small animals how to divide these things into four parts, okay?