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教学内容:人教课标版二年级数学教科书上册第41页的内容。一、复习导入,引出新课……师:一个角是由哪几个部分组成的?生:一个顶点,两条边。(学生边讲老师边画出一个角)师:那么怎样判断角的大小呢?生:张口大就大,张口小就小。师:你们认识什么角?生:直角。师:谁来画一个直角给大家看看?生:在黑板画直角。师:他画对了吗?(指名回答)生:对了。师:请你给大家说说你是用什么办法判断他画的是直角,好吗?
Teaching content: People teach the second edition of textbook version of the textbook on the first 41 pages. First, the review import, leads to a new lesson ... ... division: a corner which is composed of several parts? Health: a vertex, two sides. (Students while teaching a teacher to draw a corner) Teacher: So how to determine the size of the corner it Health: Zhang mouth large, small mouth small. Teacher: What angle do you know? Health: Right angle. Teacher: Who draws a right angle for everyone to see? Health: draw right angle on the blackboard. Teacher: Did he paint right? (Named reply) Health: Yes. Teacher: Please tell us what method you are using to judge whether he draws a right angle, okay?