义务教育五年制小学数学第十册新建小学 阚震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.一、说教材1、教学内容2、学情分析3、教学目标 4、教学重难点5、教学准备：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. 经历探索分数的基本性质的过程，理解分数的基本性质。 能运用分数的基本性质，把一个分数化成指定分母（或分子）而大小不变的分数。 经历观察、比较、猜想、操作和讨论等学习活动，体验数学学习的乐趣。教学目标 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.教学重点：理解、掌握分数的基本性质。教学难点：发现和归纳分数的基本性质，以及应用它解决相应的问题。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.二、说教学策略l说教法l说学法创设动态情境，引导合作探究、自主学习教学策略。动手实践自主探索合作交流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.三、说教学流程（一）创设情境，引发猜想。（二）自主探索，寻找规律。（三）比较归纳，内化迁移。（四）自主学习，应用规律。（五）多层练习，巩固深化。（六）课堂小结， 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.（一）创设情境，引发猜想。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.猜猜：两个儿子是怎么想 的？你认为长者能这样分 吗？在分数王国中，老师遇到了一桩奇 怪的事，一长者要平分家中一亩良 田给两个儿子，每人可得这块地的，可贪心的大儿子非要得这块地的，小儿子想了想，他要这块地的。长者愁眉不展。122448Evaluation 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.（二）自主探索，寻找规律。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.导学目标一l交流预习中，你是怎样用折一折、涂一涂的方法，找到这张纸的、l比一比： 这三个分数的大小，说明比的方 法和结果。l如果继续对折，你还能再找出与它们相等的 分数吗？能找到多少个？244812 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.=导学二：比较每组分数的分子和分母：从左往右看，是按照什么规律变化的？从右往左看，又是按照什么规律变化的？通过观察，你发现了什么？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. = 442266=请 注 意 观 察 ！= 331.51.566Evaluation 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.=331.51.566= 442266从演示中，你能发 现什么规律吗？分数的分子、分母同时乘以或除以相同的数，分数的大小不变。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.右边的式子对吗 ？为什么？分数的分子、分母同时乘以或除以相同的数，分数的大小不变。同时相同的数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.分数的分子、分母同时乘以或除以相同的数，分数的大小不变。(0除外)这叫做分数的基本性质 。“相同的数”是指哪 些数？右边这样列式行吗 ？为什么？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.现在你能明确地告 诉长者能不能这样分 ？为什么？ 在分数王国中，老师遇到了一桩奇怪的事 ，一长者要平分家中一亩良田给两个儿子 ，每人可得这块地的二分之一，可贪心的 大儿子非要得这块地的四分之二，小儿子 想了想说，他要这块地的八分之四。长者 愁眉不展。 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.（三）比较归纳，内化迁移。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.分别说出黄色部分所