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1、第一课时10000 以内数的认识教学内容:课本第 73-74 页,“做一做”1、2。教学目标:1、通过具体的实例让学生感受到万以内的数在生活中的应用,建立形象的感性认识,发展学生的数感,了解大数的价值。2、认识新的计数单位“”,单位进一步理解相邻的两个计数单位之间的十进制关系。3、学会读写万以内的数(中间、末尾没有零),知道数的组成,掌握数位顺序表。教学重难点:认识新的计数单位“万”,会数万以内的数,掌握数位顺序表。教学准备:教学挂图、计数器,一个数位顺序表格(空的)。教学过程:一、准备练习。观察下列两组数,先回答是怎么数的,再接着数出后面的5 个数来。27、37、47、57、()()()()
2、()110、210、310、410、()()()()()、读出下面的数。谁能说说读数时要从哪位读起?怎样读?、想一想,是几位数?再添是多少?它是几位数?二、讲授新课师:同学们,昨天老师让你们调查了芜湖长江大桥的公路桥和铁路桥的长度,下面请你们来汇报一下调查的结果。学生汇报调查的数据,教师板书,并让全班同学认读。接着老师问同学们,有谁知道南京长江大桥的公路桥和铁路桥的长度呢?1、出示南京长江大桥的图。(1)请学生说一说对南京长江大桥的认识。教师补充说明,南京长江大桥是我国在长江上最早建立的公路、铁路两用桥。(2)请学生认读公路桥、铁路桥的长度。2、板书:万以内数的认识。齐读3、教学例 4。(1)
3、观察例 4 中的立方体。数一数:一个大立方体中有多少个小立方体?(请学生说一说是怎么数的。)(2)一个大立方体中有1000 个小立方体,这儿有10 个大立方体,共有多少个立方体呢?根据学生所说,师生共同数一数。(一千一千地数。)(3)小结并板书。一千一千地数,10个一千是一万。“万”也是一个计数单位,它和千是相邻的计数单位,千位在左起第四位,万位在左起第五位。请学生指出计数器上的千位、万位。教师拨一千,学生数一千,直到拨10 个一千,学生数一万。4、教学列 5。(1)教师拨出 2356,请学生认出读。根据学生认读板书:读作:三千三百五十六。如何写出这个数?请一名学生板书。(写作:2356。)(
4、2)师:这个数是由()个千,()个百,()个十和()个一组成的。(3)有关这个数你还知道什么?(多请几名学生说,学生可能说出它是几位数,最高位是什么数位。)5、课堂练习。(1)课本第 75 页的“做一做”第 1 题。先写出各数,再读一读,最后说出这些数的组成。文档编码:CX10G9J4Z6Y1 HV1Y5L5D8J9 ZI1U6A5B8B8文档编码:CX10G9J4Z6Y1 HV1Y5L5D8J9 ZI1U6A5B8B8文档编码:CX10G9J4Z6Y1 HV1Y5L5D8J9 ZI1U6A5B8B8文档编码:CX10G9J4Z6Y1 HV1Y5L5D8J9 ZI1U6A5B8B8文档编码:C
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11、)用计数器数数,一个一个地数。从 994-1000;从 9995-10000。(男、女生分组数数,每组数一题。)6、数位顺序表。(1)说一说到目前为止,你已学过哪些计数单位?哪些数位?(2)你通从左往左分别说出它们的顺序吗?(3)教师拿出数位顺序表格问:有谁会填出这张表?(教师请一名学生填写,其他学生在本子上自己制作。)(4)记这个表格。(同桌互说。)三、巩固练习同桌互相拨数、认读,并将认读的数写在本子上。四、课堂小结说一说你今天有什么收获?五、作业练习十六第 3 题、第 8 题。写出下面各数。九千零三十二写作_ 五千零二十写作_ 三千零三写作_ 六千四百零五写作_ 四千零四写作_ 八千一百写
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