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一、教学背景《义务教育数学课程标准》指出:“有效的数学学习活动不能单纯地依赖模仿与记忆,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。”《实数》选自浙教版第三章第二节,本节课主要是通过学生的自主探索和合作交流,让学生体验无理数的无限不循环性,经历数的第二次扩展。对“无理数的无限不循环性这个内容的教学有如下的片段。二、教学片段探究2姨有多大?
First, the teaching background ”Compulsory education mathematics curriculum standards“ pointed out: ”Effective mathematics 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." Since the Zhejiang Education Edition Chapter III, Section II, this lesson mainly through the students’ independent exploration and cooperation and exchange, so that students experience the irrational number of infinite non-circular, experiencing the second expansion of the number. Second, teaching fragments to explore 2 aunt how much?