1、麻城小学:郑冰麻城小学:郑冰Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.0.45 1.2 0.367复习一复习一先把下面的小数化成分数,先把下面的小数化成分数,再说一说小数化分数的方法。再说一说小数化分数的方法。先化成分母是先化成分母是1010、100100、10001000的分数,再约分。的分数,再约分。小数小数分数分数Evaluation only.Created with Aspose.Slides for.
2、NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.复习二复习二先把下面的分数化成小数,再先把下面的分数化成小数,再说一说分数化小数的方法。说一说分数化小数的方法。325631007 81用分子除以分母用分子除以分母分数分数小数小数Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.50%50%120%120%60%60%、40%40%你还想了
3、解百分数的你还想了解百分数的哪些知识?哪些知识?Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.1 1把把0.24、1.4、0.123化成百分数。化成百分数。0.241.40.123百分数是分母为百分数是分母为100的特殊分数。的特殊分数。1231000241004 10124%140%14 10140 10012.3 10012.3%小数小数分母是分母是100100的分数的分数百分数百分数Evaluation onl
4、y.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.做一做做一做把下面各数化成百分数。把下面各数化成百分数。0.5151%207%2.070.02542.5%400%想一想:怎样能很快地把小数化成百分数?想一想:怎样能很快地把小数化成百分数?Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose P
5、ty Ltd.5151.%0把把小小数数化化成成百百分分数数,只只要要把把小小数数点点向向右右移移动动两两位位,同时在后面添上百分号。同时在后面添上百分号。.Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.2 2把把27%、135%、0.4%化成小数。化成小数。27%135%0.4%271000.271.35135 100 0.4 1000.004百分数百分数小小 数数Evaluation only.Created w
6、ith Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.把下面各百分数化成小数把下面各百分数化成小数。21%0.210.990%4.5%0.045想一想:怎样能很快地把百分想一想:怎样能很快地把百分数化成小数?数化成小数?Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.21%0把把百百分分数数化化成成
7、小小数数,只只要要把把百百分分号号去去掉掉,同同时时把把小小数点数点向左移动两位向左移动两位。.21.0Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.我的收获我的收获 今天我学习了百分数和小数的今天我学习了百分数和小数的互化,我能算:互化,我能算:1 1、小数化成百分数。、小数化成百分数。0.7()%5()%1.08()%0.305()%7050010830.5Evaluation only.Created with
8、 Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.2、百分数化成小数或整数。、百分数化成小数或整数。150%()500%()0.4%()1.75%()1.550.0040.0175Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.3 30.750.1671.675%16.7%160%小数小数分数分数百分
9、数百分数把把 、化成百数。化成百数。34163513416351Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.把分数化成百分数,通常先把分把分数化成百分数,通常先把分数化成小数(除不尽时,通常保数化成小数(除不尽时,通常保留三位小数),再把小数化成百留三位小数),再把小数化成百分数。分数。0.750.1671.675%16.7%160%3416351Evaluation only.Created with Aspos
10、e.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.4 4把把17%、40%、12.5%化成分数。化成分数。17%40%12.5%17100 40 100 12.5 100百分数百分数分母是分母是100100的分数的分数 2 5 125 1000 1 8最简分数最简分数Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd
11、.把百分数化成分数,先把百分数改把百分数化成分数,先把百分数改写成分数,能约分的要约成最简分写成分数,能约分的要约成最简分数。数。17%40%12.5%17100 40 100 12.5 100 2 5 125 1000 1 8Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.2、百分数化成分数。、百分数化成分数。62.5%()0.25%()8%()72%()37.514014.32 今天我学习了百分数和分数的今天我学习
12、了百分数和分数的 互化,我能算:互化,我能算:1 1、分数化成百分数。、分数化成百分数。()%()%()%()%382511715085412522518Evaluation 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 L
13、td.努努力力吧吧!Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.下面的正方形表示下面的正方形表示“1”1”,把各图中阴影部,把各图中阴影部分按要求表示出来。分按要求表示出来。用小数表示(用小数表示()用分数表示(用分数表示()用百分数表示(用百分数表示()10099%0.09用小数表示(用小数表示()用分数表示(用分数表示()用百分数表示(用百分数表示()201155%0.55Evaluation only.Cre
14、ated with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.按由小到大的顺序按由小到大的顺序排列下列各数。排列下列各数。0.5410.0540.5043.9%2750Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.A:一位小数:一位小数B:两位小数:两位小数C:三位小数:三位小数A把把 化成百
15、分数时,百分号前化成百分数时,百分号前一般保留(一般保留()。)。1 13 3Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.A:向左:向左B:向右:向右C:一位:一位A把把 6.4%6.4%化成小数,先把百分号去掉,化成小数,先把百分号去掉,然后把然后把6.46.4的小数点(的小数点()移动()移动()。)。DD:两位:两位Evaluation only.Created with Aspose.Slides for.
16、NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.B在在一一个个自自然然数数(0 0除除外外)后后面面添添上上一个一个“%”%”,这个自然数就(,这个自然数就()。)。选一选选一选A:扩大:扩大100倍倍B:缩小:缩小100倍倍C:减少:减少100倍倍Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.小小 数数0.60.61.251.25百分数百分数55%55%分分 数数382360%350.5511200.37537.5%125%1410.66766.7%Evaluation only.Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.Copyright 2004-2011 Aspose Pty Ltd.