1、,课题,小数乘小数(2),根据下面的积,给里面的数点上小数点。,67 13 = 8.71 156 32 = 8.192 25 26 = 0.87535 48 = 16.8,填表。,12.6,1.26,1.26,0.126,0.280.45的积是几位小数?在哪里点小数点?,整数部分没有怎么办?,小明的阳台上有一个花架,它的底面是边长0.28米的正方形。这个花架的占地面积是多少平方米?,0,0,在积里点小数点时,位数不够的,在前面用0补足。,0.0784 平方米,你能给下面各题的积点上小数点吗?,0,0,0,0,0,根据第一栏的积,写出其它各栏的积。,7.2,0.72,7.2,7.2,0.072,
2、0.10.3= 0.60.03= 0.60.2= 0.20.2= 0.50.4= 0.0110= 0.010.8= 0.050.8=,直接写得数。,0.03,0.12,0.2,0.008,0.018,0.04,0.1,0.04,在括号里填合适的数。,0.152.3=1.5( ),0.630.2=6.3( ),15.80.76=( )7.6,2.540.08=( )8,0.23,0.02,1.58,0.0254,一块长方形铝板,长0.9米,宽0.4米;从它上面截取一个最大的正方形,这块铝板还剩多少平方米?,长方形:0.90.4=0.36( ),正方形:0.40.4=0.16( ),剩余:0.36-0.16=0.2( ),?,0.9-0.4=0.5( ),m,0.50.4=0.2( ),答:这块铝板还剩0.2平方米。,一个修路队修一条公路。第一天修28.5米,第二天修的是第一天的2.4倍。,(1)两天一共修路多少米?,(2)第二天比第一天多修路多少米?,28.5+28.52.4=96.9(平方米),28.52.4-28.5=39.9(平方米),答:两天一共修路96.9米。,答:第二天比第一天多修路39.9米。,