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有效的动手操作,应当是动态想象先于实物操作(或画面展示)。数学教学如果过分依赖动手操作,或者直接、简单地呈现动手操作的过程,反而妨碍学生数学抽象思维的形成,不利于空间观念的培养。笔者有幸听了特级教师钱金铎老师执教的“图形的旋转”一课,真正见识到钱老师是如何让学生充分经历动态想象的过程,用足、用好动手操作的素材。现撷取三个片段与大家分享。
Effective hands-on operation, should be dynamic imaging prior to the physical operation (or screen display). If the teaching of mathematics is excessively dependent on the hands-on operation, or directly and simply presents the hands-on operation, it impedes the formation of mathematical abstract thinking of students and does not favor the cultivation of the concept of space. The author was fortunate enough to listen to the lesson of “Rotation of Graphics” taught by teacher Qian Jinduo, who really saw how teacher Qian made students fully experience the process of dynamic imagination, use them and make good use of hands-on material. Now capture three fragments to share with you.