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    华琴主页 >> 文章 >> 教育反思 >> 浏览信息《众人划桨开大船》

    教育反思 | 评论(1) | 阅读(1162)
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    星期三   晴天 
    主题 众人划桨开大船

    众人划桨开大船

     

    星期五下午两节课后是集体备课时间,本次集体备课的主讲人是我,主备内容是第二单元长方体和正方体。

     

    其实这个单元,我们已经进行到长方体和正方体的体积部分,进度已经过半,所以,我就想把我在教学中的一些困惑提出来给大家讨论,听一听大家有什么好的解决问题的方法。

     

    关于长方体的展开图,学生们已在动手操作,再观察的基础上,发现若展开图中相邻两个图形完全相同,则可以判断这个展开图一定不能围成长方体,我也及时肯定了学生的可贵发现,并在全班普及强化,但关于那些展开图可以围成正方体,一直到学生操作结束,也没有能够给学生提供巧妙地方法,只是告诉学生万变不离其中的方法,就是在草稿本上照图画一遍,再剪下来,围一围,看看能否围成正方体。显然这个方法可行,但比较麻烦,特别是考试,并觉得时间不宽裕的时候就更显不够简便。

     

    有没有更为简单的判断方法呢?我一把问题提出,立刻就有一位经验比较丰富的长期执教六年级的老师告诉我一个方法,即观察展开图,若展开图中有四个正方形在一行,其余两个正方形分别在这一行的上面和下面,这种展开图肯定能围成正方体。当即用书后的展开图来验证,无一例外都是符合的。为什么呢?其实,那就是找相对面的问题,在这种展开图中,都能找到相对的面,且不重复,不遗漏,也就是说,如果有一个面同时有两个面与其相对,那肯定就不能围成正方体了。

     

    经过讨论,不仅掌握了图例和类型,还知道了理论依据,真可谓受益匪浅!其实,在我们的周围有很多这样的老师,他们或许不善言辞,不善表达,不善把自己的经验形成文字,在更大的范围内,让更多的教师受益,但不可否认,他们身怀绝技,是我们学习的源泉,解疑的资源,如果每次集体备课都能有今天的收获,那该多好!凝聚众人的智慧,集体的力量,还有什么问题是我们解决不了的呢?

     

    华琴 发表于:2011-2-9 12:58:23

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    码确 发表于:2018-9-5 22:10:23