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      欢迎来到原中小学教育资源网!

      五年级数学下册《正方体》课件

      课件 时间:2017-06-23 我要投稿
      【www.dnfdy.com - 课件】

        下面瑞文网小编为大家整理了五年级数学下册《正方体》课件。

        【教学内容】人教版小学数学五年级下册第20页。

        【教材分析】 教材通过让学生观察正方体物品,抽象概括出正方体的特征,指出正方体是由6个完全相同的正方形围成的立体图形。比较长方体和正方体的相同点和不同点,说明正方体可以看成是长、宽、高都相等的长方体,并用集合图表示它们的关系。比较时,可以按照面、棱、顶点的次序进行,教师整理后,利用集合图说明长方体和正方体的关系。

        【教学目标】

        1、通过观察和操作等教学活动,使学生认识正方体,掌握正方体的特征。

        2、通过观察和比较,弄清长方体和正方体之间的联系和区别。

        3、通过学习活动,培养学生的操作能力,发展学生的创新意识和空间观念。

        【教学重点】长方体的特征及长、正方体的异同点。

        【教学难点】理解长方体和正方体之间的关系。

        【数学思想】归纳思想、比较思想。

        【教学过程】

        一、创设情境,引出问题

        教师活动

        学生活动及达成目标

        拿出上节课做好的长方体,组织交流,引导学生从面、棱、顶点三个方面来说。

        揭示课题:这节课我们来学习和研究正方体的特征,并板书课题。

        说说你知道它有什么特征。

        【达成目标:通过复习旧知,使学生在概括正方体的特征时,自然而然地从面、棱、顶点三个方面来观察,激发学生的探究兴趣!

        二、共同探索,总结方法

        教师活动

        学生活动及达成目标

        一、探究正方体的特征。

        1、独立观察、合作探究。

        (1)组织学生汇报发现的正方体特征( 提示:面、棱、顶点、面的形状、面积、棱长)

        (2)正方体还有一个名称知道吗?

        2、用填空的形式小结。

        二、探究长方体和正方体的关系

        1、组织讨论交流。引导学生从面、棱、顶点三个方面来说,可以用列表法比较。

        2、提问:从比较中可以看出,正方体和长方体有什么关系?

        讨论后用集合图表示。

        拿出正方体物品,仔细观察正方体的面、棱和顶点,看看有什么发现?

        同桌说一说,再全班汇报。

        立方体、

        学生回答:正方体是由(6)个(完全相同)的正方形围成的(立体)图形。正方体也有(12)条棱,它们的长度(相等)。正方体也有(8 )个顶点。

        【达成目标:让学生主动利用迁移规律,通过多种感官的协同作用(看、摸、数、比、想),认识正方体面、棱、顶点的特点,从而对正方体有较全面的认识!

        同桌合作:拿出一个长方体和一个正方体,讨论一下,长方体和正方体有哪些相同点和不同点?

        再全班汇报。

        全班讨论得出:长方体的所有特征,正方体都具备,可以说成是长、宽、高都相等的长方体,它是一种特殊的长方体。

        【达成目标:采用递进式提出问题的教学策略,引发学生思考长方体和正方体的关系,学生在思考过程中必须对长方体和正方体的特征进行比较、归纳、整理,从而认识长方体和正方体的异同和关系,渗透归纳思想、比较思想!

        三、运用方法,解决问题

        教师活动

        学生活动及达成目标

        课本20页“做一做”:巡视指导,组织交流。

        同桌合作制作、讨论,再汇报交流。(重点:搭一个稍大的正方体至少需要8个小正方体。)

        四、反馈巩固,分层练习

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