1. By comparing with rectangle, we can understand the similarities and differences of shapes.

2. The cuboid has six faces, eight corners and 12 sides, and it is known that the cube is the most special cuboid.

3. Learn effective points in various ways.

Second, the activity preparation

1. Record sheet, three different rectangular boxes, one small rectangular box for each child.

Third, the activity process

(1) import

1. Introduce the existing experience and review the characteristics of rectangles.

Teacher: (showing a rectangle) What shape is this? What are its characteristics?

2. According to the children's answers.

Teacher: How many sides? How many angles? How many noodles?

(2) Preliminary perception of cuboid

3. Show cuboids and guide children to observe and compare the similarities and differences between rectangles and cuboids.

Teacher: Bring a new friend. How is it different from a rectangle? (Thickness) What do they have in common? (There are faces, edges and corners)

(C) careful observation to understand the basic characteristics of the cuboid.

4. Ask inspiring questions, and children can guess freely.

Teacher: How many sides does it have?

Children use rectangular boxes to explore freely.

Teacher: Please take out your own boxes. What shape is it? (Cuboid) How many faces does it have? Please count it. (In the process of reminding children to count, there is no repetition or omission. )

6. Individual children talk and discuss in front of the group, find out effective ways to count their faces, and count their faces.

Teacher: How many faces does a cuboid have? How do you calculate it? Count it for everyone? Can someone calculate it in another way? Count. (record)

7. Explore the shape of the surface and find a special cuboid.

Teacher: What shape is the face of a cuboid? (Rectangle) Is every face a rectangle? Let's have a look. Do you have any other shapes? (Show the children their boxes) What did you find? A square with two sides is also a cuboid, and all sides are squares and cuboids, but it is a special cuboid, and it also has a name called cube.

8 Explore the edges and corners of a cuboid.

Teacher: What does a cuboid have besides faces? How many corners and sides are there? Count. (Children explore communication, teachers record, and guide children to use effective points)

(4) Summarize communication

9. Teachers and children sum up and sort out the experience gained.

Teacher: Today we know (cuboid), it has (6 faces, 12 sides, 8 angles), some faces are rectangular, some faces are square, and all six faces are square cuboids, which is also called (cube). The small box we observed today is a cuboid. Do the building blocks on the construction site have cuboids? Many things in life are cuboids. You can find them and share them with your good friends in the future.

Fourth, reflection activities.

In this activity, each link is handled clearly, which conforms to the basic flow of mathematical activities. When I communicate with children, the language of answering questions is not clear and accurate enough, and no clear answer is given, which affects children's interest and fun in scientific inquiry. During the activity, I found that many children already have some concrete experiences of cuboids, which need to be used and guided by teachers, so that children can think and explore further and stimulate their interest in scientific inquiry, which is also an important task and goal of education and teaching in the field of science.