《青岛四级数学上册三位数乘两位数竖式计算》由会员分享，可在线阅读，更多相关《青岛四级数学上册三位数乘两位数竖式计算（14页珍藏版）》请在金锄头文库上搜索。
1、比一比，看谁算的又对又快。143= 125= 20030= 253=492= 10070= 164= 262=153= 172= 30300= 153= 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 P
2、ty Ltd.估算15119 73149 795 102 60 401 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.先用个位上的4去乘27, 积的末尾8与因数的个 位对齐。 再用十位上
3、的3去乘27 ，积的末尾1与因数的 十位对齐。最后把两个得数加 起来2 7 3 4 1 0 88 1 9 1 8注意积的末位要与 十位对齐！用哪一 位去乘，积的末尾 就和哪一位对齐。列竖式算一算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.Copyrigh
4、t 2004-2011 Aspose Pty Ltd.A BC DEvaluation 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.1.高速公路一期工程全长多少米？2.高速公路二期工程全长多少米？Evalu
5、ation 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.用以前学过的两 位数乘两位数的 竖式试算一下吧 ！我可以估算一下：213200 20015=300021315=高速公路一期工程全长多少米？估算是大约
6、值，不是准确值， 所以不能用这个答案。 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.用笔算准确：1 0 6 52 1 3 12 1 3 3 1 9 5先用个位上的5去乘213 再用十位
7、上的1去乘2135注意积的末位 要与十位对齐！把所得的积加起来三位数乘两位数与两位数乘两位 数方法类似：先用两位数个位上的数乘三位数，用哪一位去乘，积的末尾就和哪一 位对齐，最后把两次乘得的积相加。小结再用两位数十位上的数乘三位数，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 Aspo
8、se Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.高速公路一期工程全长多少米？21315=答：高速公路一期工程全长 3195米。3195（米）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 200
9、4-2011 Aspose Pty Ltd.2.高速公路二期工程全长多少米？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.这样列更好：2 6 0 5 22 6 01 2我这样列竖式：26
10、012=高速公路二期工程全长多少米？5 2 0 2 6 0 3 1 2 01 22 63 1 2 03120（米）答： 高速 公路 二期 工程 全长 3120 米。小结：先用0前面的数相乘 ，然后看因数末尾共有几 个0，就在积的末尾添写几 个0。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 2004-20
11、11 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.3 7 5 1 2 2 4 0 4 5 3 0 9 2 6 说说计算过程!乘数中间有0时计算中应怎么办啊?拓展提升7 5 0 3 7 54 5 0 01 2 0 9 61 0 8 0 01 8 5 46 1 88 0 3 4Evaluation 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
12、 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.森 林 医 生7 9 21 3 2 1 61 3 2 9 2 47 2 41 2 4 3 63 7 24 4 4 44 3 81 4 6 2 32 9 23 3 5 8上面的计算对吗? 不对的改正过来。1 3 2 2 1 1 27 4 46 Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Prof
13、ile 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.每辆车可以坐40人。公交公司共有这样的 大客车128辆。一共可以坐多少人？128 405120Evaluation only.Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0.Created wit
14、h Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd.Copyright 2004-2011 Aspose Pty Ltd.课堂小结通过这一课的学习你有 哪些收获？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.
