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1、义务教育课程标准实验教科书义务教育课程标准实验教科书 四年级上册第四年级上册第84页页Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.3.写出与下面各数接近的整十数。 31 46 52 63 87 21 741.口算 205= 80 4= 549= 18060= 35050=2.笔算8420= 24530=Evaluation only.Created with Aspose.Slides for .NET 3.5
2、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.（1）一本作文选多少元？8421= 48404(元)2184）Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2004-201
3、1 Aspose Pty Ltd.你是把除数看做几试商的？你是把除数看做几试商的？ 4324032162936 90 324）81）245726 923）做一做做一做1.Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.这种词典这种词典39元元我还有我还有196元，元，想买那种词典。想买那种词典。Evaluation only.Created with Aspose.Slides for .NET 3.5 Client
4、 Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.（2）王老师还有196元，要买39元一本的词典，可以买多少本？还剩多少元？19639=519515(本) 1(元)39196）19639）4156404040商商4小了小了改商改商5Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.做一做2.27238731850405）2726818537）9029）Evaluat
5、ion only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.1.（ ）里最大能填几？20 （ ）85 60 （ ）20640 （ ）316 90 （ ）64370 （ ）165 30 （ ）28250 （ ）408 80 （ ）505Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose
6、Pty Ltd.2.根据试商的情况，很快说出准确商。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.小结：笔算除数是两位数的除法时，除数个位上是1、2、3、4，可以把尾数舍去，把它看作整十数来
7、试商。除数个位上是5、6、7、8、9的两位数，试商时，用“五入”法把除数个位上的数舍去，看作整十数试商。初商是不是合适，要用它和除数相乘的积与被除数比较进行检验才能确定。大家想一想除数是两位数的除法怎么样试商？这样检验初商是否合适？Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.作业：完成练习十五第4、5、6题。Evaluation only.Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.
