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lao shi , qing nin ting wo ba hua shuo wan
Author(s): 
Pages: 37
Year: Issue:  6
Journal: XIAOXUE JIAOXUE

Abstract:  在听一位教师教学北师大版教材三年级下册"量一量"这节课时,有这样一个片段.师:(出示长方形与正方形)怎样比较这两个平面图形的大小呢?生:把这两个图形重叠起来.师:(演示后)大家看,用重叠的方法很难比较面积大小.下面同桌合作,利用身边的材料,想办法动手比一比.
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