百分数和分数的互化课件例3.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,*,百分数和分数的互化,3,5,0.6,60%,2,7,0,.,286,28.6%,把 、化成百分数,1,6,3,5,1,3,4,3,4,0.75,75,1,6,0.167,16.7,3,5,1,1.6 160,商四位，留三位，百分数上落一位,怎样能很快地把分数化成百分数？,分数,百分数,先把分数化成小数，再化成,23,75,4,3,12.5,125,8,1,把17,、,40,、2.5,化成分数,17,17,100,40,40,100,2,5,2.5,2.5,100,25,10,00,1,40,百分数和分数之间怎样互化？,分数,百分数,先把分数化成小数，再化成,先把百分数改写成分数再约分,1,6,0.167,16.7,2.5,2.5,100,25,1000,1,40,怎样能很快地把百分数化成分数？,百分数,分数,先把百分数改写成分数再约分,把分数化成百分数，通常先把分数化成,小数（除不尽时，通常保留三位小数），再,把小数化成百分数；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,分数,分数,百分数,先把分数化成小数，再化成,先把百分数改写成分数再约分,把下面各分数化成百分数,1,5,0.220,%,1,5,0.,375,37.5,3,8,0.333,33.3,1,3,1,4,3,8,1,3,5,9,0.2,5,2,5%,1,4,0.556,55.6,5,9,把下面各百分数化成分数,27,、,40,、,65,、,145%,、,2.6%,27,27,100,1,45,1,45,100,29,20,40,40,100,2,5,65,65,100,13,20,2.6,2.6,100,26,100,0,13,500,4.,看图填空。,5,3,60,3,2,66.7,7,、下面每个大正方形都表示,“,1,”,，分别用分数、小数和百分数表示图中的涂色部分。,3,10,0.3,30%,1,4,0.25,25%,13,20,0.65,65%,