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有效的数学学习活动不能单纯依赖模仿与记忆，动手实践、自主探索与合作交流是学生学习数学的重要方式。根据这一理念，笔者在“圆的认识”一课的教学设计中，花１５分钟时间，让学生通过对生活中车轮的探究，发现圆的特征，学习圆的知识，效果颇佳。首先出示问题：生活中很多
Effective mathematical learning activities can not simply rely on imitation and memory, hands-on practice, independent exploration and cooperation and exchange is an important way for students to learn mathematics. According to this idea, I spent 15 minutes in the teaching design of “Awareness of the Circle”, which enables students to discover the characteristics of the circle and learn the knowledge of the circle through the exploration of the wheel in life. First show the question: a lot of life