三年级上册解决问题的策略(二)电子教案.ppt

,*,最新苏教版三年级数学下册,解决问题的策略（二）,画线段图,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,1.第一行摆12个 ，第二行摆24个 。24里面有（）个12，的个数是 的（）倍。,2.绿花有12朵，黄花有24朵，黄花是绿花的几倍？,3.黄花有24朵，黄花的朵数是绿花的2倍，绿花有多少朵？,4.绿花有12朵。黄花的朵数是绿花的2倍，黄花有几朵？,2,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,读清题目,分析条件,解答问题,找到条件,选择方法,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,问：红花有多少朵？,（1）说一说：图中的条件和问题；,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,绿花,黄花,红花,（）朵,多（）朵,？,12,7,（2）填一填：把题中的条件和问题填在书本第74页的线段图中；,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,想一想：,要求出问题，必须先求出什么？,（1）黄花有多少朵？,（2）红花有多少朵？,12,2=24（朵）,24+7=31（朵）,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,如果,“,红花比黄花少7朵,”,，应该怎样解答？,7,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.,想想做做,多20个,排球有多少个？,足球有多少个？,50+15=65（个）,50+15=65（个）,65+20=85（个）,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,想想做做,桃树和梨树一共有多少棵？,苹果树有多少棵？,48+36=84（个）,84,20=64（个）,48+36=84（个）,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,想想做做,答：小丽游得最快，小华游得最慢。,三位选手都要游60米，长度相同的情况下，怎么比较谁快谁慢？,？,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,想想做做,32,2=64（盆）,18+14=32（盆）,答：月季花有64盆。,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,作业：补充习题,第70、71页,6,3,1,2,4,5,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,创编题,45,30,15,根据线段图编一道实际问题，并解答。,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,