小数点移动(课件)..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,*,小数点移动,学校：东方小学,执教：方美琪,我的身高是,1 4 2,米,.,10,5,510=50,（元）,5100=500,（元）,51000=5000,（元）,0.001 10 =,0.001 100 =,0.001 1000=,0.0010,0.00100,0.001000,0,00,000,？,0.001,怎么输入呢？,1,0.1,0.01,0.001,10,10,10,1000,100,0.1,0,0.001,0.002,0.003,0.004,0.009,0.008,0.007,0.006,0.005,0.01,0,0.1,0.2,0.3,0.4,1,0.9,0.8,0.7,0.6,0.5,0.1,0,0.01,0.02,0.03,0.04,0.09,0.08,0.07,0.06,0.05,0.1,0.001 10 =0.01,0.001 100 =0.1,0.001 1000 =1,1.416 10 =,1.416 100=,1.416 1000=,14.16,141.6,1416,动手操作,（,3,）,2.6,乘,1000,，结果是多少？,（,1,）把,0.103,的小数点向右移动一位，得,多少？原数乘几？,（,2,）把,0.103,乘,100,，小数点向什么方向,移动几位，得多少？,12.3 10 =1.23,12.3 100=0.123,12.3 1000=0.0123,0,0,0,0,0,1.4 10 =,1.4 100=,1.4 1000=,动手操作,0.14,0.014,0.0014,10,3.14,左,两,左,两,2.35,右,三,2,小数点向（）移动（）位,（）,4.5,0.045,小数点向（）移动（）位,100,(),235,小数点向（）移动（）位,1000,(),0.002,100,小数点向左移动一位,（）,31.4,(),小数点的移动,直接写得数,0.01610=4.8710=,80.7100=4.21000=,0.16,0.487,8070,0.0042,想一想，填一填,9.4()=940 ()1000=345,5()=0.5 ()100=0.99,小数点的移动,100,10,0.345,99,填空,（,1,）最大的三位数先除以,100,，,再乘,10,，结果是（）。,（,2,）（）的小数点向右移动两位，再向左移动三位后是,0.39,。,99.9,3.9,