人教版数学四年级下册《练习十八》习题ppt课件.ppt
四年级下册数学练习十八,1.口算。,0.48.7,1.40.9,4.53.6,7.13.5,0.280.54,52.7,9.1,8.1,0.82,0.5,3.6,2.3,2.,27.07,17.21,22.27,12.41,43.29,33.43,3.计算下面各题。,12.451.960.810.490.89.69,7.0211.3820.9618.420.9639.36,19.9214.49.9234.329.9224.4,85.7(15.34.8)85.710.575.2,40(2.750.86)403.6136.39,9.54.856.1314.356.138.22,4.地球表面积是5.1亿平方千米,其中陆地面积是1.49亿平方千米。海洋面积比陆地面积多多少亿平方千米?,5.11.491.493.611.492.12(亿平方千米)答:海洋面积比陆地面积多2.12亿平方千米。,5.肖红跳过了多少米?你还能提出其他数学问题并解答吗?,我比张英跳得高0.15m。,1.10.150.091.250.091.16(m)答:肖红跳了1.16m。,我比你跳得低0.09m。,6.完成下表,并说一说每轮动作后,这3对选手的得分和排名情况。,368.4,343.32,337.62,7.王叔叔买了一个 和一个,应付多少钱?,69.8052121.8(元)121.8100121.820101.8(元)答:应付101.8元。,8.它们能一起过桥吗?,2.65t,680kg,470kg,680kg0.68t 470kg0.47t 2.650.680.473.330.473.8(t)3.84答:它们能一起过桥。,