1, knowing that combined graphics will decompose combined graphics into plane graphics that have been learned.
2. Cultivate students' reading ability and comprehensive application of relevant knowledge through finding, dividing and spelling, and reasonably use the methods of "cutting" and "filling" to calculate the area of combined drawings.
3. Cultivate students' observation ability and practical ability, develop the concept of space and improve the flexibility of thinking.
4. Let students feel the close connection between mathematics and real life, and realize the beauty of life that mathematics brings to everyone.
Teaching emphasis: explore and master the area calculation method of combined graphics.
Difficulties in teaching: to understand and master the combination and decomposition methods of combined graphics.
Teaching aid preparation: multimedia courseware
School tools preparation: all kinds of colored cardboard, glue, scissors, etc.
Teaching process:
First of all, review the groundwork:
Students, the teacher wants to know which plane figure calculations you have learned?
Second, create situations to stimulate the introduction of interest.
Decomposition according to known conditions
Teacher: You have learned a lot. In order to reward you, the teacher invites you to enjoy some beautiful buildings, ok? Please think carefully when you appreciate it: what did you find? (Courseware demonstration)
Teacher: The students have carefully observed it! In addition to these, the teacher also found some such graphics:
(Courseware demonstration)
Have we learned these numbers?
Please observe carefully. What are the common features of these figures?
How many numbers are there on the left? What about the right? Let's think about it. A graph can be composed of several graphs.
What do we call these diagrams which are composed of several simple diagrams? how do you know (Blackboard: Combination Graphics) What do you want to explore in this class about combination graphics?
Third, study independently and explore new knowledge.