1. Knowing the angle in combination with the living conditions can correctly find out (point out) the angle on the surface of an object or in a plane figure, know the names of various parts of the angle, and make the angle with different methods and materials.
2. Experience the perception angle in the operation activities, and develop mathematical thinking in the process of exploring the angle size and comparison methods.
Design concept
Micro-lesson videos first introduce new knowledge from old knowledge, which is naturally excessive and easy for primary school students to understand. First list the common corners in concrete life, and then abstract them into the number "corner". Then ask the students to sum up the component of inductive angle. Show dynamically, let students know how to draw angles and how to compare the angles.