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    华琴主页 >> 文章 >> 教后反思 >> 浏览信息《设计题组贯穿复习和新授》

    教后反思 | 评论(1) | 阅读(1072)
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    星期一   晴天 
    主题 设计题组贯穿复习和新授

    设计题组贯穿复习和新授

     

    教学“求一个数比另一个数多(或少)百分之几的实际问题”时,先出示一组复习题:东山村去年原计划造林16公顷,实际造林20公顷。

     

    1)实际造林是计划造林的百分之几?

     

    2)计划造林是实际造林的百分之几?

     

    问题出示后,先指名学生说说所求问题,并列式解答,教师根据学生回答板书,再引导学生比较两个问题的相同点和不同点。相同点是都要求一个数是另一个数的百分之几,通过一个数除以另一个数来解答;不同点是看作单位“1”的量不同,因此算式不同,计算结果也不同。

     

    通过比较问题(1)和问题(2)的异同,复习上学期已学的“求一个数是另一个数的百分之几的实际问题”,孕伏单位“1”的量不同,导致计算的算式不同,为本课即将学习的新知做好铺垫。

     

    有问题(1)和问题(2)作基础,再把提出问题的任务交给学生,问:由这两个已知条件,还可以提出什么问题?学生纷纷举手发言,教师根据学生口答板书:

     

    3)实际造林比计划造林多百分之几?

     

    4)计划造林比实际造林少百分之几?

     

    这两个问题分别是求什么呢?请同学们说说对问题(3)和问题(4)的理解,把新知转化成旧知,明确:求实际造林比计划造林多百分之几,就是求实际造林比计划造林多的面积是计划造林的百分之几;求计划造林比实际造林少百分之几,就是求计划造林比实际造林少的面积是实际造林的百分之几。

     

    鉴于对问题(3)和问题(4)的理解,学生得出第一种解法:(3)先算实际造林比计划造林多多少公顷,再算实际造林比计划造林多百分之几;(4)先算计划造林比实际造林少多少公顷,再算计划造林比实际造林少百分之几。

     

    比较这两个问题的上述解法,有没有相同点呢?学生独立思考后,与周围同学交流,发现问题(3)和问题(4)都可以先算实际造林与计划造林的差(即两个数量的差),再用差除以单位“1”的量。

     

    这种解答方法在六上曾经学习过,所以解释以后,全班同学几乎都能理解并掌握。但解决“求一个数比另一个数多(或少)百分之几的实际问题”,只掌握一种解法是不够多。那么还有没有其他解法呢?第二种解法的教学以学习水平好的同学带领,说算式及算理,帮助不能独立想出第二种方法的同学理解并掌握。在此基础上,教师再作提示和小结。

     

    回顾整个教学过程,以题组串联复习和新知,衔接旧知和新知,巧妙帮助学生实现知识的迁移,更有利于学生掌握所学新知,完善已有认知结构。

     

    华琴 发表于:2011-2-14 9:56:32

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