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1、六年级数学上册第三单元(分数除法)课题倒数的认识课时第 1 课时教学内容教材 28 页的例 1 教学目标知识与技能:引导学生通过观察、研究、类推等数学活动,理解倒数的意义,总结出求倒数的方法过程与方法:通过互助活动,培养学生与人合作、与人交流的习惯情感态度与价值观:通过自行设计方案,培养学生自主探索和创新的意识。教学重难点教学重点:理解倒数的含义,掌握求倒数的方法。教学难点:教学准备教学过程个性化修改一、导入1、找找下面文字的构成规律呆杏土干吞吴2、按照上面的规律填数74()23()21()能根据分之和分母的位置关系,给这三组数取个名吗?揭示课题:倒数的认识二、教学实施师:关于倒数同学们想知道
2、些什么呢?学习倒数的含义。观察教材 28 页的例 1,归纳,总结倒数的含义。1、举例验证:4 和41,7和71,3和314 乘41的积是,所以 4 和41互为倒数;7 可以看成分母是 1 的分数,把分子、分母调换位置后就是71,所以 7 和71互为倒数。归纳:乘积是 1 的两个数互为倒数。2、特殊数:0 和 1(引导学生辩论 0 有没有倒数,1 有没有倒数,是多少?)教师归纳板书:0 没有倒数,1 的倒数就是它本身。3、求倒数的方法让学生根据已学知识独立解决怎样求一个数的倒数,集体订正,教师归纳,板书:求倒数的方法4、反馈练习完成教材 29 页的“做一做”,完成练习六的第3、4 题三、课堂练习
3、1、找一找下列数中哪两个数互为倒数2 4381127 1 76 0 3467412、填空43的倒数是(),()的倒数是81。10的倒数是(),()没有倒数。四、课堂小结学完本节课,我们知道了乘积是1 的来年各个数互为倒数。1 的倒数是它本身,0 没有倒数。课题分数除以整数课时第 2 课时教学内容教学目标知识与技能:1、引导学生在具体的情景中借助已有的经验理解分数除法的意义并掌握分数除法的计算方法,能正确计算分数除以整数。过程与方法:通过富有启发性的问题情景和探索性的学习活动,引导学生主动参与、独立思考、合作交流,形成计算技能。情感态度与价值观:在教学中渗透转化的思想,让学生充分感受转化的美妙与
4、魅力。教学重难点教学重点:1、分数除法意义的理解2、分数除以整数的算法的探究。教学难点:分数除以整数的算法的探究。教学准备教学过程个性化修改文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC
5、10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4
6、A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 Z
7、C7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4
8、F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档
9、编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9
10、W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8一、创设情景导入:1、同学们
11、,你们去过超市购物吗?(去过)你去买了一些什么东西呢?你有没有过相同的东西买几件的时候?能不能举个例?(指名让学生举例并用算式表示求该例的总价)二、新知探究:(一)分数除法的意义1、出示例 1 的教学挂图,让学生看图观察图意,指名口答图意和应该怎样列式。2、(学生独立思考,口答问题和列式)3、(引导学生将整数乘除法应用题改变成分数乘除法应用题)4、引导学生观察比较整数乘除法的问题和改写后的问题,分析得出整数除法和分数除法的联系以及分数除法的意义。5、练习:(巩固加深对意义的理解)课本28 页做一做。学生独立练习,订正时让学生说明为什么这样填。(二)、分数除以整数1、小组学习活动:活动把这张纸的
12、45平均分成 2 份,每份是这张长方形纸的几分之几?活动把这张纸的45平均分成 3 份,每份是这张长方形纸的几分之几?活动要求 先独立动手操作,再在组内交流:通过折纸操作和计算,你发现了什么规律?你有什么问题要提出来?2、汇报学习结果:活动 1 学生甲:把45平均分成 2 份,就是把 4 个15平均分成 2 份,1 份就是 2 个15,就是25;用算式表示是:452=(42)/5=25学生乙:把45平均分成 2 份,每份就是45的12,就是4512;用算式文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3
13、S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7
14、R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9
15、Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码
16、:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9
17、R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U1
18、0 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10
19、J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8表示是:4512=410=25;学生丙:我发现了计算452 时,可以用分子 42 作分子,分母不变;学生丁:我发现分数除以整数可能转化成乘法来计算,也就是乘以这个整数的倒数;活动 2:学生甲:4 要平均分成 3 份,不能直接分,我先找出4 和 3 的最小公倍数 12,把 4 分成 12份,再把 12 份平均
20、分成 3份,算式可以用453 表示,4 不能够被 3 整除,这道题我不知道怎样计算;学生乙:我的分法与前面的同学相同,不同的是:我在计算453 时,我把453 转化成4513来计算,因为,把45平均分成 3 份,就是求45的13是多少。讨论:1、从折纸实验和计算来看,你发现计算分数除以整数可以怎样计算?2、整数可以为 0 吗?小结并板书:分数除以一个不等于0 的整数,等于分数乘以这个整数的倒数。三、巩固与提高3、把35平均分成 4 份,每份是多少;什么数乘6 等于320?4、如果 a 是一个不等于 0 的自然数,13a 等于多少?1a3 等于多少?你能用一个具体的数检验上面的结果吗?四、全课小
21、结。1、通过这节课的学习,你有什么收获?2、分数除以整数的规律是怎样的?文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8
22、Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10
23、HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4
24、X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8
25、 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1
26、L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8
27、文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z83、这节课,你还有什么不太明白的地方?课题一个数除以分数(一)课时第 3课时教学内容32 页的例
28、 2 教学目标知识与技能:1、通过画线段图引导学生分析并归纳一个数除以分数的计算法则。2、能运用法则,正确迅速地计算分数除法。过程与方法:通过观察、比较、计算、交流等活动探索新知识。情感态度与价值观:让学生通过探索知识,从而获得知识,体验成功的乐趣,树立学习的自信心。教学重难点教学重点:分析并归纳一个数除以分数的计算法则。教学难点:理解一个数除以分数的算理。教学准备课件教学过程个性化修改一、复习导入1、计算:5610 353 151620 403926 (说一说,你在计算中如何尽量避免错误的产生?在计算中要注意什么?)2、胜利路长 1000米,东东走完全程用了20 分钟,东东平均每分钟行多少米
29、?(独立解答并且说明解题依据)3、23小时有()个13小时,1 小时有()个13小时。二、新知探究:1、教学例 2:小明23小时走了 2km,小红512小时走了56 km,谁走得快些?文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9
30、Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码
31、:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9
32、R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U1
33、0 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10
34、J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3
35、S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7
36、R1L4F9Z8师:已知什么?生:已知小明和小红各自的时间和对应的路程。师:问题求什么?生:求谁走的快些。师:求谁走得快些?就是比较什么?生:就是比较谁的速度快。师:你能根据题意列出算式吗?生:223565122、除数是分数的除法计算方法的探究:引导学生画线段图分析:师:23里有几个13?23小时走了 2 km,能不能求出13小时走多少千米?生:23里有 2 个13,求13小时走了多少千米可以用2 km2,也就是 2km12;师:2 km2 得到的 1km,有什么具体的含义?是线段图上的哪一段?生:略师:1 小时里有几个13小时,能求 1 小时行多少千米了吗?生:2123=232=3 km。指
37、导学生观察:223=2123=232=3(提示:观察 223=232这一步)文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9
38、R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U1
39、0 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10
40、J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3
41、S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7
42、R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9
43、Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8师:这儿把除法转化成什么运算来计算?除以23=?生:把除法转化为法来计算,除以23等于乘以3
44、2。师:你能用自己的语言叙述整数除以分数的计算方法吗?(有语言叙述、用字母表示等都行,只要是正确的都肯定学生的结论)师:请你观察上面和算式,怎样把除法转化成为乘法来进行计算?你能说出转化的要点吗?生:1、被除数没有变化;2、除号变乘号;3、除数变成了它的倒数。3、学生独立计算56512订正并板书:4、让学生根据分数除法的意义检验后作答。三、巩固与提高:1、32 页做一做第 1 题和第 2 题的后两个小题。(做完 1 题后,让学生把每个算式完整地读一遍,然后再完成第2 题,第二题要求学生要写出计算过程。)四、师生共同小结1、这节课我们学习了哪些知识?“除数是分数的分数除法计算题”2、一个数除以分
45、数的计算方法是什么?“除以不等于 0的数,等于乘这个数的倒数”课题分数除法的练习课时第 4课时教学内容教学目标1、在理解分数除法算理的基础上,正确熟练地进行分数除法的计算;2、运用所学的分数除法的知识,解决相应的实际问题。教学重难点教学重点:正确熟练地进行分数除法的计算教学难点:运用所学的分数除法的知识,解决相应的实际问题教学准备文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9
46、W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5
47、U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC
48、10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4
49、A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 Z
50、C7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4F9Z8文档编码:CZ9W9R8Z5U10 HC10J4X4A3S8 ZC7R1L4