Teaching objectives According to the requirements of the new curriculum and the characteristics of teaching materials, combined with students' cognitive ability, I have formulated the following teaching objectives: 1. Knowledge and skills: (1) Let students explore and master through hands-on operation and experimental observation? The area formula of triangle. (2) Let students use the area formula of triangle to calculate the area of related graphics, and solve simple practical problems. ?

They all think their triangle is the largest, but no one can convince anyone. Students, are you willing to help them solve this problem? So "to compare triangles? What is the size of the contrast? " Students will easily answer, "Do you want to compare triangles? The size of is the area of a triangle.

"Today we will discuss how to calculate the area of a triangle. (thus revealing the topic: triangle area calculation, and writing the topic on the blackboard. Ask the students to guess what the triangle area may be related to the figure we have learned. Students think independently and come to a conclusion, which may be related to the area of rectangle and parallelogram.

Suggestion:? This class also has some shortcomings. For example, the basic mathematical idea of this course should be a transformed mathematical thinking method, that is, the area of a triangle is transformed into the area of a parallelogram that students have learned to think about, and thus the calculation formula of the triangle area is deduced.

From the teaching form, I have basically achieved it, but we should know that the purpose of teaching is not only to teach students to learn knowledge, but more importantly, to teach students to learn learning methods. So I want to point out in the summary of this class that this way of thinking is called transformation in mathematics. When we encounter a new problem, we can use our brains to turn it into old knowledge that we have learned before.

This played a "finishing touch" role, but unfortunately I neglected it. Therefore, in the future teaching, we should pay attention to improving students' thinking quality, not just imparting knowledge.