人教版三年级数学下册(估算除法).ppt

人教版三年级数学下册(估算除法).ppt

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人教版三年级数学下册(估算除法)

* * 神奇的宝塔 80÷ 2= 800÷ 2= 8000÷ 2= 40 400 4000 30÷ 6= 300÷ 6= 3000÷ 6= 5 50 500 21÷ 7= 210÷ 7= 2100÷ 7= 3 30 300 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. 青蛙可以活6年,比目鱼可以活60年。比目鱼的寿命是青蛙的多少倍? 60÷6=10 答:比目鱼的寿命是青蛙的10倍。 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. 三年级的同学去果园里劳动。女同学有39人,男同学有41人。4个同学分成一组,一共可以分成几个小组? 39+41=80(人) 80÷4=20(个) 答:一共可以分成20个小组。 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. 同学们做了38件玩具,送给托儿所18件,剩下的平均分给2个幼儿班,每班分得多少件玩具? 38-18=20(件) 20÷2=10(件) 答:每班分得10件玩具。 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. 用围棋子围成一个正方形,每边10个,四边共用多少个棋子? 答案 36个 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. 80÷4 =   350÷5 =   90÷3 =  400×2= 2400÷6=   500÷5= 20 30 400 70 800 100 复 习 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. 人教新课标版三年级数学下册 估算除法 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.

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