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“平移和旋转”是两种基本的图形变换,也是学生在日常生活中经常看到的现象,所以学生已积累了不少关于平移和旋转现象的感性认识,但是缺少从数学层面去认识的深入思考。对于二年级学生来讲,平移和旋转本质还是有些模棱两可,不能真正体会它们的特点,不能辨析平移和旋转的区别。那么怎样帮助学生初步感知平移与旋转现象呢?另外,二年级学生正处于直观思维阶段,不善于思考变和不变的关系。那么,怎样帮助引导学生在方格
“Pan and Rotate ” are two basic graphics transformations, which are also commonly seen by students in their daily life. Therefore, students have accumulated a great deal of perceptual knowledge about the phenomena of translation and rotation, but they lack the understanding of mathematics In-depth thinking. For sophomores, the nature of translation and rotation is somewhat ambiguous, can not really appreciate their characteristics, can not distinguish the difference between translation and rotation. So how to help students initially perceive the phenomenon of translation and rotation? In addition, sophomores are in an intuitive thinking stage, not good at thinking of change and the same relationship. Well, how to help guide students in the box