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1、小数乘除法总复习,小数乘法,小数除法,积的近似数,连乘、乘加、乘减,小数乘整数,小数乘小数,整数乘法运算定律推广到小数,一个数除以小数,小数除以整数,商的近似数,循环小数,用计算器探索规律,1、口算3.20.1=6.32.1=0.470.2=10.4=0.002500=9.24=0.80.2=0.222=,0.32,3,0.081,2.5,1,1.3,0.16,0.11,3.124=0.2350.8=320.5=1.2235.4=,0.78,0.188,64,43.188,笔算,智慧屋,1、简便计算3.5210.1 1.25322.5,=3.52(10+0.1),=3.5210+3.520.1
2、,=35.2+0.352,=35.552,=1.25482.5,=(1.258)(4 2.5),=1010,=100,简便计算2.50.2+2.59.8 0.2800.5,=2.5(0.2+9.8),=2.510,=25,=0.2 0.5 80,=(0.20.5)80,=0.1 80,=8,1天=()秒 90分钟=()小时20分=()秒 2.3千米=()米3.44平方厘米=()平方分米82dm=()m 300千克=()吨180分钟=()小时2平方米=()公顷3.2公顷=()平方千米,86400,1.5,1200,2300,0.032,8.2,0.034,0.3,3,0.0002,2、解决问题一堆煤有42.5吨,一次运7吨,要运几次?,42.577(次),答:要运7次。,明明每天吃240g饼干,一包饼干1200g,有4包。41200240 表示12004表示1200240表示,4包饼干能吃几次,一共有多少克饼干,1包饼干能吃几次,+=20-=3+=23 6=,12,9,2,