（2020新）（北师大版）二年级数学下册《8数一数(一)》课件.ppt

1、 数一数（一）数一数（一）（建议两课时完成）（建议两课时完成）第三单元第三单元 生活中的大数生活中的大数 二年级下册 课后课后作业作业探索探索新知新知1课堂探究点课堂探究点2课时流程课时流程课堂课堂小结小结当堂当堂检测检测9 01第第1课时课时 数一数（一）数一数（一）探究点探究点 认识并感受认识并感受“千千”再添再添1个珠子是多少？个珠子是多少？9 09 01再添再添1个珠子是多少？个珠子是多少？9 09 09 01再添再添1个珠子是多少？个珠子是多少？有多少个有多少个？数一数。？数一数。1 填一填。填一填。(1)9个添个添1个是个是()个，个，99个添个添1个是个是()个，个，999个添个

2、添1个是个是()个。个。(2)10个一是个一是()，10个十是个十是()，10个一百是个一百是()。(3)九百九十九后面的数是九百九十九后面的数是()，前面的数是，前面的数是()。(4)100里有里有()个十，个十，1000里有里有()个十，个十，1000里有里有()个一，个一，1000里有里有()个一百。个一百。10一千一千九百九十八九百九十八100100010100100010010101000小试牛刀小试牛刀（源于（源于典中点典中点）2数一数，填一填。数一数，填一填。4321083按要求写出下面各数。按要求写出下面各数。(1)一个一个地数，数出九百九十五后面的五个数。一个一个地数，数出九

3、百九十五后面的五个数。九百九十五、九百九十五、_、_、_、_、_。(2)十个十个地数，从三百六十数到四百。十个十个地数，从三百六十数到四百。三百六十、三百六十、_、_、_、_。(3)一百一百地数，从六百数到一千。一百一百地数，从六百数到一千。六百、六百、_、_、_、_。九百九十六九百九十六九百九十七九百九十七九百九十八九百九十八九百九十九九百九十九一千一千三百七十三百七十三百八十三百八十三百九十三百九十四百四百七百七百八百八百九百九百一千一千4涂一涂。涂一涂。用红色彩笔涂出二百六十四个小方格。用红色彩笔涂出二百六十四个小方格。略。略。5估一估，填估一估，填“十十”“”“百百”“”“千千”。一辆

4、大客车大约可乘四一辆大客车大约可乘四()人。人。一本故事书大约一一本故事书大约一()页。页。一列火车大约有乘客一一列火车大约有乘客一()人。人。十十百百千千归纳总结：归纳总结：（讲解源于（讲解源于点拨点拨）认识计数单位认识计数单位“千千”1.“千千”是比是比“百百”高一级的计数单位。高一级的计数单位。2.10个一是十，个一是十，10个十是一百，个十是一百，10个一百是一千，个一百是一千，相邻两个计数单位之间的进率是相邻两个计数单位之间的进率是10。小试牛刀小试牛刀（教材（教材P20练一练）练一练）1一个一个地数，从二百九十八数到三百零二，并一个一个地数，从二百九十八数到三百零二，并在计数器上拨

5、一拨。在计数器上拨一拨。二百九十八，二百九十九，三百，三百二百九十八，二百九十九，三百，三百零一，三百零二。拨一拨略。零一，三百零二。拨一拨略。一百二十五个一百二十五个一百零六个一百零六个2说一说，有多少个说一说，有多少个？作作 业业 请完成请完成典中点典中点的的“应用提升练应用提升练”和和“思维思维拓展练拓展练”习题，具体内容见习题课件。习题，具体内容见习题课件。10个个100个个第第2课时课时 数一数（一）数一数（一）想一想，再大致圈出一千个想一想，再大致圈出一千个 。一千有多大？一千有多大？6估一估，大约有多少朵花？估一估，大约有多少朵花？大约有大约有1200朵花。朵花。小试牛刀小试牛刀

6、（源于（源于典中点典中点）7数一数，填一填。数一数，填一填。10001000归纳总结：归纳总结：（讲解源于（讲解源于典中点典中点）110个一是十，个一是十，10个十是一百，个十是一百，10个百是一千。个百是一千。2估计物体的数量时，先圈出估计物体的数量时，先圈出10个个(100个个)，圈了，圈了几次就是几十几次就是几十(几百几百)。小试牛刀小试牛刀（教材（教材P21练一练）练一练）1估一估，圈一圈，大约有多少个估一估，圈一圈，大约有多少个？略。略。清水湖清水湖车站车站4看一看，按要求标出车站和清水湖的大致位置。看一看，按要求标出车站和清水湖的大致位置。清水湖在山洞东面三百米，车站在果园西面四百

7、米。清水湖在山洞东面三百米，车站在果园西面四百米。5涂一涂。涂一涂。(1)涂出一百三十八个方格。涂出一百三十八个方格。(2)涂出三百零六个方格。涂出三百零六个方格。略。略。一千块糖一千块糖一千元钱一千元钱6数一数，说一说，一共有多少？数一数，说一说，一共有多少？7小组游戏，试试看。小组游戏，试试看。略。略。8在下面各数的后面连续数出在下面各数的后面连续数出5个数。个数。(1)一百六十八、一百六十八、_、_、_、_、_。(2)三百零九、三百零九、_、_、_、_、_。(3)六百七十七、六百七十七、_、_、_、_、_辨析：辨析：“拐弯拐弯”数数时不知下一个数是多少。数数时不知下一个数是多少。一百六十

8、九一百六十九一百七十一百七十一百七十一一百七十一一百七十二一百七十二三百一十三百一十三百一十一三百一十一三百一十三三百一十三三百一十四三百一十四六百七十八六百七十八六百七十九六百七十九六百八十一六百八十一六百八十二六百八十二一百七十三一百七十三三百一十二三百一十二六百八十六百八十易错辨析易错辨析版权申明本文部分内容，包括文字、图片、以及设计等在网上搜集整理.版权为个人所有This article includes some parts,including text,pictures,and design.Copyright is personal ownership.用户可将本文地内容或服务用

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25、sonal study,research or appreciation,and other non-commercial or non-profit purposes,but at the same time,they shall abide by the provisions of copyright law and other relevant laws,and shall not infringe upon the legitimate rights of this website and its relevant obligees.In addition,when any conte

26、nt or service of this article is used for other purposes,written permission and remuneration shall be obtained from the person concerned and the relevant obligee.转载或引用本文内容必须是以新闻性或资料性公共免费信息为使用目地地合理、善意引用，不得对本文内容原意进行曲解、修改，并自负版权等法律责任.Reproduction or quotation of the content of this article must be reaso

27、nable and good-faith citation for the use of news or informative public free information.It shall not misinterpret or modify the original intention of the content of this article,and shall bear legal liability such as copyright.版权申明本文部分内容，包括文字、图片、以及设计等在网上搜集整理.版权为个人所有This article includes some parts,

28、including text,pictures,and design.Copyright is personal ownership.用户可将本文地内容或服务用于个人学习、研究或欣赏，以及其他非商业性或非盈利性用途，但同时应遵守著作权法及其他相关法律地规定，不得侵犯本网站及相关权利人地合法权利.除此以外，将本文任何内容或服务用于其他用途时，须征得本人及相关权利人地书面许可，并支付报酬.Users may use the contents or services of this article for personal study,research or appreciation,and oth

29、er non-commercial or non-profit purposes,but at the same time,they shall abide by the provisions of copyright law and other relevant laws,and shall not infringe upon the legitimate rights of this website and its relevant obligees.In addition,when any content or service of this article is used for ot

30、her purposes,written permission and remuneration shall be obtained from the person concerned and the relevant obligee.转载或引用本文内容必须是以新闻性或资料性公共免费信息为使用目地地合理、善意引用，不得对本文内容原意进行曲解、修改，并自负版权等法律责任.Reproduction or quotation of the content of this article must be reasonable and good-faith citation for the use of

31、 news or informative public free information.It shall not misinterpret or modify the original intention of the content of this article,and shall bear legal liability such as copyright.版权申明本文部分内容，包括文字、图片、以及设计等在网上搜集整理.版权为个人所有This article includes some parts,including text,pictures,and design.Copyright

32、 is personal ownership.用户可将本文地内容或服务用于个人学习、研究或欣赏，以及其他非商业性或非盈利性用途，但同时应遵守著作权法及其他相关法律地规定，不得侵犯本网站及相关权利人地合法权利.除此以外，将本文任何内容或服务用于其他用途时，须征得本人及相关权利人地书面许可，并支付报酬.Users may use the contents or services of this article for personal study,research or appreciation,and other non-commercial or non-profit purposes,but

33、 at the same time,they shall abide by the provisions of copyright law and other relevant laws,and shall not infringe upon the legitimate rights of this website and its relevant obligees.In addition,when any content or service of this article is used for other purposes,written permission and remunera

34、tion shall be obtained from the person concerned and the relevant obligee.转载或引用本文内容必须是以新闻性或资料性公共免费信息为使用目地地合理、善意引用，不得对本文内容原意进行曲解、修改，并自负版权等法律责任.Reproduction or quotation of the content of this article must be reasonable and good-faith citation for the use of news or informative public free information.It shall not misinterpret or modify the original intention of the content of this article,and shall bear legal liability such as copyright.