We should understand the structure of parallelogram. A parallelogram has four sides, so a total of three parallelograms need 12 sides. We can think of it this way: First, we need four matches to make a parallelogram. It also takes four matches to push out the second parallelogram. Finally, the third parallelogram also needs four matches.

The topic requires us to move only three matches, so we must consider how to move matches most effectively to achieve our goal. In order to move the least number of matches, we can consider sharing the common sides of three parallelograms. In this way, we can use nine matches to form three parallelogram frames, and then move three matches to perfect three parallelograms.

The role of teaching AIDS in the teaching process;

Teaching AIDS can help students better understand abstract concepts. In the teaching process, some abstract knowledge such as concepts and principles are often difficult for students to understand. Through the intuitive display of teaching AIDS, students can connect abstract concepts with actual objects or models, so as to better understand and master this knowledge.

2. Teaching AIDS can enhance the memory effect. Research shows that people are more likely to remember information related to their own experiences or perceptions. By using teaching AIDS, students can connect what they have learned with actual objects or models to form a more vivid memory impression, thus enhancing the memory effect.

3. Teaching AIDS can improve students' learning interest and participation. Teaching with teaching AIDS is often more lively and interesting, which can arouse students' curiosity and thirst for knowledge, thus stimulating students' interest and participation in learning. At the same time, the use of teaching AIDS can also promote classroom interaction and increase students' participation opportunities.

4. Teaching AIDS can promote the development of thinking. By using teaching AIDS, students can find and solve practical problems, thus cultivating innovative thinking and practical ability. At the same time, the use of teaching AIDS can also help students form a more comprehensive way of thinking and look at problems from multiple angles.

5. Teaching AIDS can cultivate innovative ability. In the teaching process, teachers can cultivate students' innovative ability and practical ability by letting students design and make teaching AIDS independently. This will not only help to improve students' comprehensive quality, but also lay a good foundation for their future career development.