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“圆的周长”是人教版小学数学六年级上册的教学内容,教学难点是如何让学生在已经掌握长方形、正方形周长计算方法的基础上推导出圆的周长计算公式。课堂中,笔者从正方形与圆的关系入手进行教学。教学片断一:课件出示狗兔赛跑的情景(如图1):小狗沿着正方形的路线跑,兔子沿着圆的路线跑,结果兔子赢了,小狗觉得不公平。师:为什么小狗认为不公平呢?想一想,正方形和圆有什么关系?
“Circumference of Circumference” is the teaching content of the sixth grade of PEP in PEP, and the difficult teaching point is how to make students calculate the formula of the circumference of the circle on the basis of having mastered the calculation method of the rectangle and the circumference of the rectangle. In class, I started with the relationship between the square and the circle. Teaching a fragment of a: courseware show dog and rabbit racing scene (Figure 1): the dog runs along the square route, the rabbit ran along the circle route, the result of the rabbit won, the dog felt unfair. Teacher: Why do puppies think it unfair? Think about the relationship between squares and circles.