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2012年第4期《中小学数学》(小学版)刊载了《怎样求不规则海绵的体积》一文。文中叙述了作者在“容积和容积单位”(人教版五年级下册)教学时所遇到的问题:原来该部分知识中有这样的一节内容:怎样求形状不规则的物体(如土豆、橡皮泥等)体积?本来用排水法求形状不规则的物体的体积,学生很快就理解和掌握了,可是在“导学互动”环节有位学生却提出了:“怎样求不规则海绵的体积?”由于书中介绍的都是求在正常情况下不吸水物体的体积,但海绵是非常容易吸水的物体!所以这是作者预设之外问题。机智的作者又非常巧妙地把问
No. 4, 2012 “Primary and secondary mathematics” (elementary school edition) published a “How to find the volume of irregular sponge” article. The article describes the author in “volume and volume unit ” (PEP fifth grade) teaching problems encountered: the original part of the knowledge of such a section: how to seek irregularly shaped objects ( Such as potatoes, plasticine, etc.) Volume? Originally used drainage method for the irregular shape of the volume of objects, the students quickly understand and mastered, but in the “interactive learning” part of a student has proposed: “ How to find the volume of irregular sponge? ”As the book describes the volume of non-absorbent objects under normal circumstances, but the sponge is very absorbent objects! So this is the author’s pre-set questions. Witty author very cleverly asked