北师大版三年级数学下册《练习五》课件教学文案.ppt

北师大版三年级数学下册,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,练 习 五,1.,涂色部分占整个图形的几分之几？,(),(),(),(),3,5,5,8,4,9,2,8,平均分成,5,份,涂色部分占,3,份,平均分成,8,份,涂色部分占,5,份,平均分成,9,份,涂色部分占,4,份,平均分成,8,份,涂色部分占,2,份,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,2.,想一想，填一填。,红星占全部星星的 ，,(),(),蓝星占全部星星的 。,(),(),梨占全部水果的 ，,(),(),苹果占全部水果的 。,(),(),5,1,5,4,7,4,7,3,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,3.,按分数圈一圈。,一共有,5,列,需要圈出,3,列,一共有,3,列,需要圈出,2,列,一共有,4,列,(,行,),需要圈出,3,列,(,行,),Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,4.,看图填一填。,(1),参加跳绳活动的共有,(),人。,(2),男同学占总人数的 ，女同学占总人数的 。,(),(),(),(),(3),请你再提出一个数学问题，并试着解答。,9,9,6,9,3,男同学人数比女同学人数多几分之几？,6,9,3,9,3,9,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,5.,涂一涂，比一比。,1,5,1,6,2,4,3,4,6.,看图填一填。,1,3,4,8,5,2,3,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,3,4,2,10,2,2,7,9,2,8,3,8,+,5,8,1,5,8,3,8,答：两人共吃了这个蛋糕的 ，还剩 。,5,8,3,8,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,9.,奇思看一本书，第一天看了全书的 ，第二天看的和第一天,2,7,同样多。两天一共看了几分之几？还剩几分之几没看？,2,7,2,7,+,4,7,1,4,7,3,7,答：两天一共看了 ，还剩 没看。,4,7,3,7,1,8,(),(),(),10.,涂色部分占整个图形的几分之几？,2,4,4,18,2,9,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,1,2,3,4,5,6,7,11.,制作七巧板。,(1),拿一张长方形纸，折出一个最大的正方形，并剪下来。,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,(2),用剪下的正方形纸，按下面的顺序制作七巧板，并涂上不,同的颜色。,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,(3)1,号图形是原正方形的几分之几？,2,号呢？它们共占原正方形,的几分之几？,2,4,1,4,1,4,1,4,答：,1,号、,2,号图形都是原正方形的 。,答：它们共占原正方形的 。,2,4,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,(4)3,号、,4,号、,5,号、,6,号、,7,号图形分别占原正方形的几分之几？,1,8,1,16,1,8,1,16,1,8,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,