分数与除法北师大版五年级数学上册Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.课前复习判断:(1)假分数都大于1( )(2)带分数都比假分数大( )(3)小于 的真分数只有Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.把一块蛋糕平均分给2个小朋友,每人可以 分到几块蛋糕?如果把7块蛋糕平均分给3 个小朋友呢?Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.观察与交流12=73=被除数除数=Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.怎样把 化成带分数?=分子分母=分子 分母余数 分母商Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.怎样把 化成假分数.2分子分母整数=整数X分母+分子分母Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.1、能找出下面每句话中的单位“1”吗？试一 试： （1）、小青课外书的数量是小亮课外书的2/3 ； （2）、五年级数学组的老师是全校老师的 8/127。 2、说说下面分数的意义： （1）、我国人口约占世界人口的1/5； （2）、人的血液约占体重的1/13；Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.3、列式计算： （1）、把48棵树苗平均分给8个小组栽 ，每组栽多少棵？ （2）、8米长的钢管平均分成2段，每 段长多少米？把一个数平均分成几份，求 每一份是多少，用除法。Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.舞台前面的边长为4米，把它平均分 成5份，便于摆花盆，每份的长度是 多少米？把每1米平均分成5份，1份是1/5 米；4个1/5米就是4/5米。 Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.先填表，再说一说你发现了什么？先用 除法表示，再用分数表示： （1）、把1千克大米平均分成3份，每份 有多少千克？ （2）、把3块饼平均分成4个同学，每个 同学分得多少块？Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.把3块饼平均分给4位同学，每个 同学分得多少块？34 （块）的意义是：把 （ ）平均分成4份，表示这样的（ ）份的数。 Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.把3块饼平均分给4位同学，每个 同学分得多少块？34 （块）的意义是：把 （ ）平均分成4份，表示这样的（ ）份的数。单位 “1”3 1 3Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.分数与除法的联系与区别:联联系区别别分数分 子分 数 线线分 母分数是一个 数可以看作 两个数相除 除法 被 除 数除 号除 数除法是一种 运算Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.3、列式计算： （1）把5米的铁丝平均分7份，每份长 多少米？（2）小王骑自行车5分行了1千米 ，平均每分行多少千米？Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.这节课，我们学习了这节课，我们学习了 分数与除法的关系，分数与除法的关系，你能说一说你有哪些你能说一说你有哪些 感受或收获吗？感受或收获吗？Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.