人教版三年级数学下册(口算除法估算).ppt

人教版三年级数学下册(口算除法估算).ppt

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人教版三年级数学下册(口算除法估算)

一本故事书有438页,小丽用4个星期看完,小丽每星期大约看了多少页? 练习: 1、79÷8中把79看成( ), 79÷8≈( ) 2、247÷5中把247看成( ), 247÷5≈( ) 3、247÷6中把247看成( ),247÷6≈( ) 练习: 说出下面各题的商大约是多少 118÷4 ≈ ( ) 276÷9 ≈ ( ) 2214÷7 ≈( ) 175名同学去春游,安排4辆客车接送,平均每辆车大约要坐多少人? 同学们要在公园种树270棵,如果每个同学种4棵,大约需要多少个同学去种树? 思考:160人去春游,每辆车坐33人,6辆车够吗?你会用不同的方法解答吗? * 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. 夏老师打算买文具送给三年(3)班 46个同学,每套文具是2元。100元够用吗? 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. 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. 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. 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. 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. 用 650 元买儿童乐园的门票,每张3元,大约能买多少张?够买175人的门票吗? Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Prof

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