1. Let the children try to divide an object into two parts during the operation, knowing that part is smaller than the whole and the whole is larger than the part.

2. Encourage children to boldly try and explore a variety of methods such as visual inspection, measurement, counting and folding.

3. Guide children to speak out the operation process and results boldly.

Active materials;

Teaching AIDS: two Teletubbies, a cake, 10 two-part card.

Learning tools: rectangular paper, scissors, ruler, wool, wrapping paper; Straws, disks, triangles and squares; Coins, broad beans, snowflakes, buttons, small bowls; 6 measuring cups, scales, cakes, tomatoes, dried tofu, knives, cutting boards, plasticine, etc.

Activity flow:

1. The children divided the rectangular paper into two parts.

(1) Invite two little guests to class. Who are they? They also brought their favorite cake, but there was only one cake and both of them wanted to eat it. What should we do?

(2) Let the children have a try. How do I know these two pieces are the same size? (overlapping)

(3) Teacher's summary: Divide the cake into two equal parts. This method is called two equal parts. Think about the cake. Besides, are there different ways to divide them? There is a rectangular piece of paper like a cake in front of every child. Would you please think of a different way to divide it into two parts?

(4) children's hands-on operation, showing children's points. (Fold edge to edge, diagonally) Let the children compare. What are the changes between the separated graphics and the original graphics?

(5) Teacher's summary: The children divide the rectangular paper into two parts by folding in half and diagonally, and divide it into two figures with the same size.

2. Divide the children into groups and try to divide them into two parts in various ways.

(1) Teletubbies invites you to visit Baby Paradise. Would you like to? When playing, children should visit in an orderly way to see what is in the park. The teacher introduced various materials and asked the children to help divide the content into two parts.

(2) Children are free to operate, and teachers focus on guiding balance weighing and object classification.

The first group: circle, triangle, square, scissors, straw.

The second group: wool, ribbon, ruler and scissors.

The third group: coins, broad beans, snowflakes and so on.

The fourth group: measuring cup and water.

Group 5: balance, plasticine, cake, tomato, dried bean curd, knife and chopping board.