一、说教材１ 教学内容 :《圆的认识》是义务教育六年制小学数学第十一册第四单元“圆”的教学的第一课时。２ 教材分析 :本课时内容是在学生学过的几种平面几何图形的基础上进行教学的。学生在低年级虽然已初步认识了圆 ,但对于建立正确的圆的概念以及掌握圆的特征来说还是比? First, the teaching material 1 teaching content: “round understanding” is the compulsory education six years of elementary school mathematics eleventh unit fourth unit “round” teaching the first class hour. 2 textbook analysis: The content of this lesson is learned on the basis of several plane geometry for teaching. Although students in the lower grades have a preliminary understanding of the circle, but for the establishment of the correct concept of the circle and grasp the characteristics of the circle is still more than?