最新课件小数的初步认识课件PPT下载北京版三年级数学下册课件.ppt
小数的初步认识,20.80元,0.20元,6.90元,54.90元,24.98元,6.00元,32.05元,0.50元,文具盒,1千克瘦肉馅15.8元,小明的50米赛跑成绩是7.98秒。,小松的体重是39.4千克。,小英的体温是37.2。,小刚的视力是4.5。,生活中的小数,身高一点八九米体重八十四点九千克,1.89,84.9,身高二点二六米体重一百四十三点三千克,2.26,143.3,1元等于几角?,等于(),0.1,0.3,0.7,1元=10角,0.01,0.05,0.18,1元=100分,(1)把1米平均分成10份,每份是1分米。1分米是米,还可以写成0.1米。3分米是米,还可以写成0.3米。把1米平均分成100份,每份是1厘米。1厘米是米,还可以写成0.01米。3厘米是米,还可以写成()米。18厘米是米,还可以写成()米。(3)王东身高1米30厘米,写成小数是()米。,0.1,0.3,0.9,1米=10分米,0.01,0.07,0.29,1米=100厘米,0.01,0.07,0.29,0.1,0.3,0.7,0.1,0.5,0.9,0.01,0.05,0.18,练习,0.7,0.07,(),(),(),0.3,0.42,0.58,(),(),(),0.7,(),(),(),(),(),(),找朋友,连一连,米厘米,厘米,10元角,.,.米,1.元,.米,0.09,0.51,6分钟=()小时,你能用小数表示吗?,动动脑筋,