二年级数学下册四《测量》1铅笔有多长课件3北师大版.ppt

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铅笔有多长,学习目标: 1. 认识米、厘米等长度单位。 2. 能够熟练掌握它们之间的关系。,1米100厘米,1米10分米,10,6厘米3毫米,6cm3mm,因为1dm=10cm,所以3dm=30cm,30,因为10mm=1cm,所以40mm=4cm,4,因为100cm=1m,所以500cm=5m,5,30mm,2cm5mm,1dm,3cm=( )mm,2m=( )cm,30,200,这两根木头的长度都是3个回形针的总长,所以这两个木头一样长。,与朋友说一说:,1米( )厘米,你认识哪些长度单位?,1米( )分米,1分米( )厘米,1厘米( )毫米,

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