西师大版数学四下小数的意义课件之二.ppt

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西师大版四年级数学下册,学习目标,本节课我们主要来学习小数的意义，同学们结合实际的例题理解并掌握小数的意义，能够把分母是整十、整百的数用小数表示，能够解决相关的实际问题。,0.1,0.5,0.1,0.3,张兵跳远2.36米,王志跳高0.92米,0.7,0.01,0.45,0.7,0.01 0.45,十分之几,百分之几,0.1,0.01,把1m平均分成1000份，其中1份是1mm。,1mm=()m=()m,146mm=()m=()m,0.001,0.146,千分之几,0.001,0.001 0.146,0.001,0.025,0.107,有（）个0.001,有（）个0.001,107,25,整数、小数数位顺序表,千分位,万分位,0.001,0.0001,把1米平均分成100份，每份长1厘米。,0.01,0.15,把1米平均分成1000份，每份长1毫米。,0.001,0.063,你发现了什么,一位小数表示十分之几，计数单位是0.1。,两位小数表示百分之几，计数单位是0.01。,三位小数表示千分之几，计数单位是0.001。,