二年级数学下册第7单元万以内数的认识认识算盘教案新人教版.doc

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1认识算盘教学目的:1直观认识算盘,知道算盘各部分的名称,学会用算盘记数和数数。2经历用算盘表示数、数数的操作过程,掌握用算盘记数的方法,初步渗透位值思想。3了解算盘的历史,知道算盘是我国古代的伟大发明之一,增强民族自豪感,激发学生对算盘的热爱。教学重点:认识算盘,会用算盘表示数。教学难点:带有上珠的数的读、写。教学过程:一、复习导入下面每幅图代表的数分别是多少?填一填,并说说它们的组成。二、探究新知认识算盘。2算盘四周叫做框,根根小棒叫做档,一根横梁分上下;梁的上面是上珠,梁的下面是下珠;一个上珠表示 5,一个下珠表示 1。二、探究新知用算盘数数、记数。用算盘数数、记数。在算盘上拔出 563。二、探究新知你知道吗?数学的逐渐发展标志着人类的不断进步。3三、知识应用1. 读出下面各数,并在算盘上表示出来。17,254,180,609,800,10002. 说一说在算盘上拨数和在计数器上拨数有什么不同。3. 写数,并读一读。四、课堂作业作业:第 81 页练习十六,第 10 题、第 11 题。

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