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1、小学六年级数学上册比的意义教学设计与反思授课教师：王时洲教学班级：六年级科目：数学授课时间：20XX年 5 月 26日课程类型：人教版基础型课程教学内容：比例的意义第一课时信息技术应用：班班通一、教材分析：教材在安排比的意义学习时，分为三个阶段：比的意义、比的各部分名称、比、分数与除法之间的关系。比的意义这节课是从富有爱国教育意义的神州五号载人飞船的例子中引出的，通过对具体例子的讨论，明确了比的概念是建立在除法的意义基础之上的，揭示了比与除法之间的本质联系，是一种以“倍比”为基础的比较关系。教材在介绍比的各部分名称时提出了比值的意义，它既是一个知识点，又有助于进一步理解比的意义。比与分数、除法
2、的关系是本节课的又一教学要点，理解它们之间的关系，对今后继续学习，特别是综合应用各种知识解决问题具有重要意义，同时也是理解比的后项不能为0 的认知基础。二、学情分析：学生在已学过和掌握分数、除法的意义，及分数与除法之间的关系的基础上，进一步学习“比的意义”。虽然学生在生活中也接触到了一些“比”，但并不了解数学的比和生活中的“比”的内在联系和区别。三、教学目标：1、知识与技能：（1）、理解比的意义，掌握比的读写法，认识比的各部分名称。（2）、理解比值的含义，知道求比值的方法，并能正确地求比值。（3）、理解并掌握比与分数、除法的关系。(4)、培养学生分析、比较、抽象概括、分析解决问题的能力和应用意
3、识。2、过程与方法：(1)、通过自主学习，合作交流，使学生掌握一定的学习方法。(2)、利用多媒体课件沟通数学与生活的联系，培养学生的应用意识。(3)、引导学生加强知识间的联系，提高学生分析解决问题的能力。3、情感态度与价值观：(1)、有机渗透爱国主义教育。(2)、引导学生探索知识间的内在联系，激发学生学习兴趣。(3)、通过课件演示，使学生感悟到数学知识内在联系的逻辑之美，增强审美意识。四、教学重点和难点：（1）、教学重点：比与除法、分数的关系。（2）、教学难点：理解比的意义。五、教学过程：1、创设情境，引入新课。师谈话引入新课，出示课题（出示课件1），同桌玩“石头剪刀布”的游戏，汇报比赛结果。
4、2、探究新知，掌握知识。(一)教学比的意义。（1）、教学同类量的比。A、请同学们看大屏幕，（出示课件 2），这是谁？关于杨利伟，你们都知道些什么？师：你们知道的真多！20XX 年 10 月 15 日，我国成功发射了第一艘文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6
5、I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7
6、N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7
7、N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9
8、P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码
9、:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W
10、9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L
11、10 HV6I2I3P7N2 ZF7N2O5W9P3载人飞船“神州”五号，（出示课件3），杨利伟叔叔就是乘坐“神州”五号载人飞船飞上太空的，实现了我们中华民族几千年的飞天梦想。（出示课件4）这就是杨利伟叔叔在太空中向人们展示联合国旗和中华人民共和国国旗时的情景。杨叔叔能干吗？（出示课件5）杨利伟叔叔展示的两面旗都是长15cm，宽 10cm，长是宽的几倍？宽是长的几分之几？怎样用算式表示？（引导学生说出，教师板书：15 10 10 15）B、师：这两个关系都是用什么方法来求的？（除法）C、师：比较这两个数量之间的关系，除了除法，还有一种表示方法，即“比”。可以说成是：长和宽的比是15 比 10（
12、师板书：15比 10），宽和长的比是10 比 15。（师板书：10 比 15）我们来看一看，长与宽的比，宽与长的比一样吗？为什么?说明什么？师：两个数量进行比较一定要弄清谁和谁比。谁在前，谁在后，不能颠倒位置，否则比表示的具体意义就变了。比是有顺序的。D、师：不论是长和宽的比还是宽和长的比，都是两个长度的比，相比的两个量是同类的量。例如：我们班有男生5 人，女生 12 人，男生和女生人数的比是几比几；女生和男生人数的比呢？（二）、教学不同类量的比。A、师（课件 5 出示）：“神舟”五号进入运行轨道后，在距地 350km 的高空作圆周运动，平均 90 分钟绕地球一周，大约运行42252km。飞船
13、进入轨道后平均每分钟飞行多少千米？怎样用算式表示？（生说师板书：4225290）B、师：对于这种关系，我们也可以说：飞船所行路程和时间的比是42252 比 90。（师板书：42252 比 90）这里的 42252 千米与 90 小时是两个不同类文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W
14、9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L
15、10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6
16、I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7
17、N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7
18、N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9
19、P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码
20、:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3的量。不同类的两个量相比可以得到一个新的量，如：路程时间=速度总价数量=单价（三）、归纳比的意义。A、师：刚才的两个例子，都是通过两个数相除来表示两个数量之间的关系，它们都可以用比来表示，所以什么是比？聪明的你能说说吗？（学生试说，教师总结板书：两个数相除又叫做两个数的比。（揭示课题）这就是我们今天学习的比的意义（师板书课题）B、学生读比的意义。1、教学比的读写法和比的各部分名称。（1）、师：关于比，我们课本第44 页还有很多知识，下面请同学们带着这些问题（出示课件6）自学，并概括相关知识点，看看谁最能干。（1）、几比
21、几怎样写、怎样读？（2）、比的各部分名称是什么？（3）、怎样求比值？（4）、比值可以怎样表示？）（5）、学 生 代 表 汇 报，师 补 充 板 书。（1510 1015 42252 90）师质疑：比号和冒号有区别吗？书写时应注意什么？（6）、学生代表汇报，教师用（课件7）逐一出示：“”是比号，读作“比”。比号前面的数，叫做比的前项，比号后面的数叫做比的后项。比的前项除以后项所得的商，叫做比值。15 10=15 10=23比值=比的前项 比的后项（7）即时练习：3 2=3 2=23或 1.5 8 1=8 1=8 比值可以用分数表示，也可以用小数或整数表示。大家想一想：比与比值有什么区别吗？（四）
22、、教学比与除法、分数的关系。（1）、（出示课件 8）小组文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 H
23、V6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3
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25、F7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5
26、W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档
27、编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF1
28、0W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3讨论：比和除法、分数的联系与区别是什么？学生完成下表：联系（相当于）区别比比的前项：比号比的后项比值除法分数A、
29、小组代表汇报，完成上表。（课件出示）B、师：如果用字母表示比与除法、分数这三者的内在关系，应该怎样表示？引导板书：a b=a b=ba（2）、根据分数与除法的关系，两个数的比也可以写成分数的形式。例如：15 10，可写成1015（师板书），仍读作“15 比 10”。（3）、（出示课件 9）(b0)想一想：比的后项可以是 0 吗？为什么？（比的后项不能是0。因为在除法算式中，除数不能为 0，比的后项相当于除数，所以比的后项也不能为0。因为在分数中，分母不能为0，比的后项相当于分母，所以比的后项也不能为 0。）师补充板书（4）、师质疑：（出示课件10）可是，在比赛场上，我们常常用比分的形式来表示两
30、个队的比赛结果，这里的比和我们这节课学习的比一样吗？这里的12 0 是什么意思？谁能说说看。学生讨论回答后，教师订正时指出（课件出示）：各类比赛中记录的比分，只表示某一队与另一队比赛各得的进球分数，不是表示两队所得分数的倍数关系，这与我们今天学习的比的意义不同，文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文
31、档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF
32、10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1
33、H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10
34、HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I
35、3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2
36、ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O
37、5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3它只是借用了我们这节课学习的比的写法。同学们观看，说说自己知道的。六、板书设计：比的意义两个数相除又叫做两个数的比。15 10 15 比 10 15 10 10 15 10 比 15 1015 42252 90 42252 比 90 42252 90 a b=a b=ba(b 0)七、巩固新知，深化提高：1、（出示课件 11）判断对错我能行。（1）小明身高 1 米，爸爸身高 1.7 米，小明与爸爸身高的比是11.7。（）（2）既可以读作十五分之七，又可以读作七比十五。（）（3）把 1 克盐溶于 20
38、克水中，盐与盐水重量的比是120。（）（4）比的前项和后项都可以为0。（）2、（出示课件 12）完成课本“做一做”的第 1、2 题。（1）小敏和小亮在文具店买同样的练习本。小敏买了6 本，共花了1.8 元。小亮买了 8 本，共花了 2.4 元。小敏和小亮买的练习本数之比是（）（），比值是（）；花的钱数之比是（）（），比值是（）。（2）3（）=24 （）8=0.5 八、课堂总结：文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3
39、P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 Z
40、F7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5
41、W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档
42、编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF1
43、0W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H
44、9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 H
45、V6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3通过这节课的学习，你有什么收获？能和大家分享一下吗？同学们这节课的表现真是太棒了！你们觉得王老师今天的表现怎么样？还有什么要对王老师说的吗？教学反思：数学知识来源于生活，也应用于生活，因此，用贴近学生生活实际的情境来引入，容易激发学生的求知欲望，激活学生的已有知识和经验，引入新课。在渗透爱国主义教育，激发学生爱国热情的同时，又能比较自然地引出比的两种运用。从同类量的比延伸到不同类量的比
46、，注重了比的概念的完整意义的教学，发展和提升了学生的思维。采取自主学习的方式让学生自学，把学习的主动权交给学生，培养他们的自学能力。学生自学能力的提高和教师提供的自学引导密切相关。设计恰当的自学问题能起到给学生指引的作用。注意概念的细微差别，让学生直观地认识，会收到意想不到的教学效果。表格形式可以帮助学生对知识进行有序整理，培养学生观察、类比、分析和概括的能力。教师是学生学习知识的引导者、参与者、合作者，在课堂教学中，创设情景，学生在已有的学习经验和基础上，通过自主探究、团结合作，交流探讨，并通过观察、归纳、类比、自学、猜想等学习方法，在一种活泼、轻松、愉快的学习氛围中去探索新知，理解新知，并
47、能掌握新知，构建知识。同时培养学生的表达能力、思维能力、创新能力和创新精神，增强学生的学习数学自信心，从中感受到学数学和做数学的乐趣。在练习中的判断对错，做一做，通过课堂中的合作与学习，学生已获取与构建新的知识，教师科学、巧妙的设计习题，让学生能够真正地理解和掌握比与分数、文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O
48、5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文
49、档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF
50、10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1H9L10 HV6I2I3P7N2 ZF7N2O5W9P3文档编码:CF10W9R1