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商的变化规律和应用.ppt

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商的变化规律及应用第六单元除数是两位数的除法 Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 一、复****导入积变化的规律因数×因数 = 积 Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 一、复****导入算一算,想一想,你能发现什么规律? 18 × 24 = 432 (18×2)×(24÷2) = 432 (18÷2)×(24×2) = 432 积不变的规律因数×因数 = 积 Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 一、复****导入计算下面两组题,你能发现什么? 200 ÷ 22040 = 100 105 ÷8 = 16 160 320 220 40 商变化的规律被除数÷除数 = 商 Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 一、复****导入乘法除法规律积变化积不变商变化商不变 Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 二、探究新知活动建议: 。。。研究报告提出猜想举例验证得出结论在除法里,被除数( ),除数( ),商不变。我验证的猜想成立吗?( ) Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 二、探究新知被除数乘或除以一个数,除数也乘或除以相同的数(0除外),商不变。 Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Co

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