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1、名师精编优秀教案异分母分数加减法教学目标1.知识目标：使学生理解异分母分数加减法的算理。2.能力目标：初步掌握异分母分数加减法的法则。3.情感目标：培养学生的观察、比较、分析、综合能力。教学重点异分母分数加减法的计算法则。教学难点运用通分的方法解决异分母分数不能直接相加减的问题。说教法、学法采用“自主探究教学法”，力图创设一定的问题情境与和谐民主的学习氛围，开放教学全过程，以两道例题为主线，引导学生自主探究、小组交流、自主建构，促使学生积极、主动、活泼地发展。教学步骤一、复习。1.同学们，我们这节课上一节数学课，温故而知新嘛！为了更好地学习新知识，我们先来复习一下旧知识。2.通分：出示通分的习
2、题，指明学生回答。这些题大家会做吗？这是我们什么时候学的什么内容？分母分数加减法计算的方法是什么呢？二、探究新知。1.引入课题。引入：同学们汶川大地震发生后，全国人民都解囊相助我们的骨肉同胞，我们五年级同学也奉献了自己的爱心，捐了不少钱。（出示照片）老师把大家的捐款情况做了一下统计，请看这副图。创设情境，这一内容与生活实际相融合，让学生产生一种熟悉感、亲切感，从而调动学生学习的兴趣和参与学习的积极性，激发学生浓厚的学习兴趣和强烈的求知欲望，引导学生主动积极地参与学习。名师精编优秀教案师：我们一起来看一下，五1 班捐款在 1020 元之间的学生占全班的几分之几？（出示12）在 2030 元之间的
3、呢？（出示13，你是怎么看出来的）你还能用分数来表示其他的信息吗？2.师：请你选择其中的两项，提出一个用分数加减法计算的问题？谁能根据他提出的问题列出算式？（板书）3.师：根据图中的信息你还能列出哪些分数加减法的算式呢？想一想并把这些算式写在练习纸上。汇报：叫一个同学板书他写的算式还有不同的吗？生报算式师随机板书。4.观察这些算式，试着把它们分一分类。（根据不同的标准，我们可以有不同的分法，我们就以刚才这位同学的分法来找一找哪些是同分母分数的加减法吧？）5.同分母分数加减法我们已经学过了，怎样计算呢？口答，谁来说一说同分母分数加减法的计算法则。为什么能直接相加减呢？6.异分母分数加减法又该如何
4、算呢？这节课我们来研究异分母分数加减法。（揭题并板书）7.教学例 1 异分母分数加法。（1）出示例 1。（2）这道题怎样计算呢？能不能象算同分母分数加减法那样直接计算呢？为什么？（3）问题就在这了，分母不同，分数单位不同就没办法计算，我们能不能开动脑筋想想办法，运用我们学过的知识，把这道题算出来呢？同学们可以和同桌或者前后桌同学说说。（4）汇报、交流。说明使用通分的方法最常用。（5）下面我们看图形，演示一下通分的过程。（6）这回容易算了吗？怎么算？（7）大家看做异分母分数加法最关键的一步是什么？文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M
5、5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A
6、3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1
7、K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ
8、9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD
9、6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2
10、V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:
11、CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3名师精编优秀教案（8）下面，我们回过头来想一下这道题的做题步骤，先干什么，再干什么？8.教学例 2 异分母分数减法。（1）师：异分母分数加法大家已经学会了，减法相信更难不住我们，下面我们选黑板上的一道减法算式来算一下。（2）这道题我们该怎么做呢？通过对例1 的学习你是不是已经想到这道题怎么做了呢？同学们在小组里讨论一下。（3）汇报讨论结果，全班交流。同学们，刚才
12、我们已经运用我们的智慧成功地解出了异分母分数加减法的题。通过这两道题我们能总结一下异分母分数加减法的计算方法吗？9.小组讨论这样组织教学，不仅提高了学生获取知识的参与度，充分体现教师为主导学生为主体的教学思想，而且培养了学生合作探究的意识。异分母分数加减法先干什么？再干什么？最后呢？10.我们看一下异分母分数加减法的计算方法是怎样的。11.我们会计算了，但是要想知道是否正确，要干什么？分数加减法的演算方法和整数加减法的验算方法相同。加法怎样验算？减法怎样验算？（两种）三、巩固新知。1.针对本节课的重点、难点，我设计了以下两个层次的练习。（1）改错，基本练习。旨在展示计算方法和注意事项。给差生“
13、拐杖”。（2）计算，综合练习。完成这一层次的练习不仅要用到异分母分数加减法的计算法则，而且要综合运用“通分”、“约分”、“把假分数化成带分数或整数”等知识点，设计的的在于强化算理，提高计算技能。2.为强化提高计算技能，我用十个字简单归纳了异分母分数加减法的解题步骤。引入：1.同学们已经基本学完了异分母分数加减法的计算方法，学的怎样呢？下面老师要考考大家！2.改错。文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1
14、K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ
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16、6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2
17、V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:
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19、HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 Z
20、Q2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3名师精编优秀教案3.计算并验算。4.我们做了这么多题已经基本熟悉了异分母分数加减法的计算方法，我们可以把解题步骤归纳成五步，简单用十个字来概括。5.聪明的你是不是已经明白这五步是什么了。四、总结：学生先总结，然后教师总结。引入：我们这节课基本上完了，同学们一定都收获不小吧，说说看。文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P
21、7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4
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24、6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9
25、D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M
26、5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3文档编码:CQ9M5F1T6M10 HD6A3V6P7D6 ZQ2V1K9D4R3