8× = 2.8﹣ = ×1= ÷9= ×20=
+ = ÷ = + = ×0.2= 1÷ =
÷9= × = ÷ = 1﹣ = 150%﹣150%=
24÷ = ÷4= 0÷ = × = ×24× =
×0= × = 6 = 3.6× = ×70=
+ = ﹣0= 55%﹣ = 2.4÷0.4= 2÷0.5=