最近准备教学苏教版四年级上册“观察物体”这一单元,翻看教案,查阅网上资料,大家都不约而同地对“每次最多看到长方体的3个面”有着浓厚的兴趣。加上《中小学数学》杂志在2014年4月上旬刊登了许玲老师关于这一话题的感悟和想法。看了之后,让我回想起了之前执教六年级复习时碰到的问题:“判断:从不同的角度观察,每次最多能看到长方体或正方体的3个面。”当时在做判断时,六年级学生基本都认为这句话是正确的,但是当我问学生“为什么?”全班没有一个学生能说得上来,学生只是凭借自己以往四年 Recently prepared to teach the Sujiao version of the fourth grade on the volume “observation object ” this unit, look at the lesson plans, access to online information, we are invariably to “every time you see the cubes of the most face ” has a strong interest . Coupled with “primary and secondary mathematics” magazine published in early April 2014 Xu Ling teacher’s sentiment and ideas on this topic. After reading, let me recall the problems encountered in the previous review of the sixth grade: “Judgment: From a different point of view, each time you can see the cubes or cubes at most 3 surfaces.” When the sixth grade students basically think that this sentence is correct, but when I ask the students “why? ” The whole class can not be a student to speak up, the students just by virtue of their past four years