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数学人教版六年级下册比例的意义

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2019-09-13上传 侵权/举报

                                                                                                                                                                  人教版六年级下册数学《比例的意义》说课稿                                                                                                                                                                                                                                                                                                                                                         额敏县第三小学           朱柳青                                                                                                                                                                                      大家好,今天我说课的内容是人教版六年级小学数学第40页的《比例的意义》。下面我将自己的设计理念、对教材的解析以及教学流程和                                                                                                                                 设计意图向大家作简要的阐述。                                                                                                                                                                                                                                   设计理念:这是一节概念课,但我并不是对知识简单的复述,而是通过学生的探究活动,展现学生“活生生”的思维过程。数学课堂教学                                                                                                                               需要必要的生活情境,现实生活中也蕴涵着大量的数学信息,因此在本课中,我不仅注重让学生体验比例在生活中的应用,更注重“数学化”                                                                                                                               和“生活化”的结合,并根据学生的发现、发展、形成的过程,使教法与学法融为一体。心理学家皮亚杰曾说过:“一切真理都要靠学生自己                                                                                                                            去获得,由他重新去发现,而不是草率的传递给学生”。学生通过观察比较,发现规律,从特殊到一般抽象概括出意义,培养了学生主动探索                                                                                                                            知识和概括知识的能力。                                                                                                                                                                                                                                                                                                                                                                       教材分析:比例的知识在工农业生产和日常生活中有广泛的应用。这部分知识是在学习了比的知识和除法、分数的关系后教学的,主要属于                                                                                                                             概念教学。因为这节课是在整个比例单元教学中的第一节,是为以后解比例,讲解正、反比例做准备的。学生学好这一点,不仅可以初步接触                                                                                                                              函数的思想,而且可以用来解决日常生活中一些具体的问题。                                                                                                                                                                                                                                                                                                                                       教学目标                                                                                                                                                                                                                                                    知识技能目标:                                                                                                                                                                                                                                              1、理解比例的意义,能根据比例的意义正确地写出比例,会判断两个比能否组成比例。                                                                                                                                                                               2、理解并掌握比例的意义,能根据比例的意义写出比例。                                                                                                                                                                                                         情感态度目标:  培养学生自主参与的意识、主动探究的精神,激发学生的审美愉悦。培养学生进行初步的观察、分析概括的能力,发展学                                                                                                                              生的思维。                                                                                                                                                                                                                                                      教学重点: 理解比例的意义。                                                                                                                                                                                                                                 教学难点:根据比例的意义写比例。                                                                                                                                                                                                                            教学设计                                                                                                                                                                                                                                                    一、创设情境 引发思考                                                                                                                                                                                                                                       多媒体出示有关国旗的三幅情境图,让学生说说图的内容,并找找图中共有的东西。接着出示三面国旗的长和宽 的具体数据,并提示国旗                                                                                                                              的制定有着特定的标准,然后让学生去思考,猜测。                                                                                                                                                                                                                                                                                                                                               二、探究新知 主动参与                                                                                                                                                                                                                                       1、根据学生的发现,让学生任意地选择其中的两面国旗,先写出长和宽的比,再求出比值进行验证自己的猜测对不对。                                                                                                                                                  

2、把学生的计算结果出示在黑板上(三面国旗都有)接着请学生仔细观察计算结果发现了什么,发现他们的比值都相等。(此处要进行尊                                                                                                                               重国旗的爱国主义教育)从而引出比例的 意义。                                                                                                                                                                                                                    3、揭示了比例的意义后及时进行练习。判断几组比能否组成比例,为什么?让学生说理由巩固概念。                                                                                                                                                                   4、回到三面国旗,让学生找比组成比例。(可以是每两面国旗的长与宽的比,也可以是长与长之比,宽与宽之比)这里教师要适时引导,                                                                                                                            鼓励学生打开思路,从不同的角度去寻找,以加深对比例意义的认识。                                                                                                                                                                                                  三、练习巩固  教材p40 的“做一做”                                                                                                                                                                                                                          四、全课总结                                                                                                                                                                                                                                                五、布置作业                                                                                                                                                           


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