一、说教材“角的初步认识”是小学人教版数学第三册第38~39页中的内容。在此之前,学生已经初步认识了长方形、正方形和三角形,这为本节内容的学习起到了铺垫作用。教材要求学生先从生活中找角,知道角的各部分名称,会用尺子画角,通过折角、画角等操作活动来掌握角的基本特征。本节课是学习直角的前提,在几何知识学习中起着承上启下的作用。在教学时,要通过创设多种活动让学生构建几何角的概念。根据教材特点以及学生实际,我确定了以下教学目 First, the teaching material “initial understanding of angle ” is the content of the third PEP 38-39 of the PEP. Until now, students have taken a first look at rectangles, squares and triangles, paving the way for this section to learn. Textbooks require students to first find a corner of life, knowing the name of each part of the corner, will use the angle of the ruler, through the angle, angle and other operating activities to grasp the basic characteristics of the angle. This lesson is a prerequisite for learning right angles and plays a role in the study of geometric knowledge. In teaching, students should construct the concept of geometry by creating a variety of activities. According to the characteristics of teaching materials and students, I confirmed the following teaching