六年级数学口算竞赛题班别: 姓名: 评价:0.10.02=4.2 0.1 =1000.35 =1001.0118.20.284.20.070.751(0.2)10002583.178.13=3.7+7.6 =2512548=1 = =25=(0.28)7 =3 =8 = 1 =-18()=201153610.036.041.9491013150.251.51.82.50.42.4+1.62425322.56.426=二、计算(能简算的要简算)4.67-(2.98+0.67)73.816-7.3860(+)+(+)三、列综合算式或方程计算。1、一个数比40的多1.2,求这个数。2、18减去它的是多少?四、把下列的比化简6:10=12:21=:=:=:2=0.3:0.4=0.25:1=3:0.5=五、化简下列各比16:20=2:=45:6=5:0.35=7.5:10=:=6.3:0.9=1:0.125=