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【教材简析】“认识角”这一内容在苏教版小学数学第四册,也就是小学二年级下册教材的P64—68内容。让学生初步认识角,认识角的含义和基本特征,并能够知道角大小的由边的叉开程度决定的。针对低年级学生数学思维能力不足的特点,运用生活中的实例,引导学生自主获得角的图形形状、顶点、边的认识。通过让学生观察扇形、剪刀和钟面上的时针和分针构成的角,引导学生观察、实践、感悟角的大小与两边叉开的程度的关系,让他们能够对角大小有一定的认
[Textbook analysis] “understanding angle ” This content is in the fourth edition of the Supiao version of primary school mathematics, which is the P64-68 content of the second grade of primary school textbooks. Allow students to first understand the angle, the angle of understanding of the basic characteristics and awareness, and can know the size of the corner by the edge of the degree of divergence decision. According to the characteristics of undergraduates’ lack of mathematical thinking ability, using the examples in life, we can guide the students to acquire the knowledge of the shapes, vertices and edges of corners independently. By having students observe the angle formed by the hour hand and the minute hand on the fan, scissors and clock face, the students are guided to observe, practice and perceive the relation between the size of the corner and the degree of divergence on both sides so that they can recognize the size of the angle