北师大版六年级数学上册--合格率讲解学习.ppt

单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,合格率,新北师大版六年级数学上册,惠安县墩北小学 赵登雄,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,思考一下：购物时，需要注意商品的那些 问题？,大家喜欢购物吗？,生产日期、保质期、,产品合格证明,、使用注意事项、等等,合格率,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,甲牌：抽查,50,箱，,43,箱合格,乙牌：抽查,60,箱，,52,箱合格,哪种品牌的罐头合格率高？,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,你知道吗？,合格率,：就是合格的产品,数量,占产品总数的百分之几,。,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,甲牌的合格率,:,乙牌的合格率,:,除不尽时,通常保留三位小数,百分号前通常保留一位小数,.,合格率合格产品,送检产品总量,=0.86,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,51,51,.,%,0,把,小数化成百分数,，只要把小数点,向右移动两位,，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.,0.25,3.25,0.03,0.9,1.2,1,=25%,=120%,=3%,=325%,=90%,=100%,0.,09,12.1,=,9,%,=120,1,%,我们一起开火车！,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,步骤：分数,小数（分子除以分母）小数,百分数,15,7,10,7,5,1,9,5,0.2,=20%,0.556,=55.6%,0.467,=46.7%,0.,7,=70%,那么，分数怎么化为百分数呢？,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,注意：把分数化成百分数，通常先把分数化成小数（除不尽时，通常保留三位小数），再把小数化成百分数。,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,或,将分数化成分母是100的分数，再改写成百分数。,=,12%,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,练习与提升,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,0.45,7.56,0.02,0.19,1.32,4,=45%,=132%,=2%,=756%,=19%,=400%,2,1,25,8,50,41,=50%,=32%,=82%,再来一起开火车！,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,0.45,7.,0,5,4.5,0.56,0.65,4,=45%,=,65,%,=,450,%,=7,05,%,=,56,%,=400%,=0.375,=,37.5,%,1.667=,1,66,.,7,%,=,1.75=175,%,0.917,=,91.7,%,这里要小心了！,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,绿色小分队参加植树活动，共植树,400,棵，有,10,棵没有成活，这批树的成活率是多少？,成活率指,成活的棵树,占,总棵树,的百分之几。,（400-10）,400,=390,400,=0.975,=97.5%,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,绿色小分队参加植树活动，共植树,400,棵，有,10,棵没有成活，这批树的死亡率是多少？,死亡率指,死亡的棵树,占,总棵树,的百分之几。,10,400,=0.025,=2.5%,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,总结：,本节课，你学到了什么？,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,谢谢！,Evaluation only.,Created with Aspose.Slides for.NET 3.5 Client Profile 5.2.0.0.,Copyright 2004-2011 Aspose Pty Ltd.,