Unfolding and folding are the seventh grade. Unfolding and folding are selected from the first volume of seventh grade mathematics (Beijing Normal University Edition), a standard experimental textbook for compulsory education.

Through students' hands-on production, in the process of learning, students not only know the relationship between three-dimensional graphics and plane graphics (plane graphics are folded into solid graphics, and three-dimensional graphics are unfolded into plane graphics along some edges), but also cultivate students' observation thinking ability, hands-on operation ability and cooperative learning ability, so as to prepare for introducing plane graphics related knowledge in the future.

Teaching objectives:

1, going through the process of unfolding, model making and other activities? Develop the concept of space and accumulate mathematics learning experience.

2. Understand some characteristics of prism in its operation activities; Knowing the side development diagram of prism, cylinder and cone, we can judge and make a simple three-dimensional model according to the development diagram.

3. Cultivate the ability of cooperative learning.