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    华琴主页 >> 文章 >> 教育反思 >> 浏览信息《教学常新,感动常在》

    教育反思 | 评论(1) | 阅读(1077)
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    星期三   晴天 
    主题 教学常新,感动常在

    教学常新,感动常在

     

    课堂教学中,我们常常为学生的精彩发言所感动,整理上一学期长方体和正方体部分的教学反思,截取了其中几个片段,作为佐证。

     

    (一)边教边学

     

    教学长方体和正方体单元之表面积的变化,通过拼拼算算,学习了由若干个完全相同的正方体和长方体拼成一个长方体,表面积会比原来若干个正方体和长方体的表面积之和减少的规律后,请学生拼拼说说:用6个体积是1立方厘米的正方体可以拼成不同的长方体(图略)。哪个长方体的表面积大?大多少?

     

    学生能较快的联想到根据每种长方体的表面积分别比原来的6个正方体的表面积之和减少了几个面的面积来判断,我很高兴,今天刚学的内容,学生能立刻拿来所用,不错!就顺势引导:共有6个正方体,拼成一个长方体,需要拼几次?

     

    生一齐告诉我:需要拼5次。

     

    我觉得答案已经快到嘴边了,但是我想听学生说出来。可是,学生们却犹疑,不肯讲话了!怎么回事?我很纳闷,也很焦急的问学生:不是减少10个面吗?怎么不敢肯定呢?

     

    这时,窦元翔提出了他的质疑:有一种长方体在拼的时候,拼成了2排,所以减少了14个面的面积。

     

    我再仔细看看图,谁说不是呢?

     

    好险,差点把错误的结论强行灌输给学生!为避免上述情形再次在教学活动中发生,我真该深入再深入的钻研教材,并怀着一个谦虚宽容的心,在教的过程中,与学生共同学习,教学相长!

     

    (二)让我们向孩子学习

     

    教学长方体和正方体的展开图,当学生将手中的长方体沿棱剪开后,引导学生观察展开图,说一说相对的两个面展开以后,从位置上看,有什么关系?

     

    周文韬很快就发现了他们的位置关系,指出相对的两个面展开后,不会靠在一起,而是被隔开!

     

    这点很重要,正当我为学生敏锐的洞察力所欢呼时,陈雯举手示意,她有话要补充,我还没有来得及表扬周文韬,向同学们强调这个特点的重要性,只得有点扫兴的请陈雯说出自己的发现:我发现,相对的两个面完全相同,因此如果展开图中,相邻的两个面完全相同是不可能的,除非这是个正方体。

     

    说的多好!我怎么没有想到要及时引申,以帮助学生判断哪些展开图能够围成长方体,哪些展开图能够围成正方体呢?

     

    我们真该放下身段,向孩子们学习!

     

    所谓教学相长是也!

     

    华琴 发表于:2011-2-9 13:25:02

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