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案例背景圆环的面积是北师大版小学六年级上册第一单元第三节的内容。是在学生已经掌握了圆面积计算公式的基础上进行的。新课标指出:小学数学教学应结合小学生的认知发展水平和已有的知识经验展开。圆环的面积看似简单,但对学生来说,理解起来有一定的难度。所以让学生理解圆环是怎么形成的,以及面积的推导过程是本节课的重点。本节课的教学目标是:1、使学生认识圆环的特征,掌握圆环面积的计算方法,并能应用圆环的面积公式进行计算。
Case background The area of the ring is the content of the third section of the first unit of the sixth grade of Beijing Normal University version of primary school. Is based on the student has mastered the circular area calculation formula based on. The new curriculum standard pointed out: primary school mathematics teaching should be combined with the level of cognitive development of primary school students and existing knowledge and experience. The ring’s area seems simple, but it’s a bit harder to understand for students. So getting students to understand how a ring is formed and the derivation of area is the focus of this lesson. The teaching objectives of this lesson are: 1. To enable students to recognize the characteristics of a ring, master the calculation of the area of a ring, and calculate the area formula of a ring.