4÷250.2 10.5÷0. 3 10.5 4.2÷0.3÷0.2 4.2÷0.06
b+7b= 60×0.5= 8.5a-5.5a= 0.52=
0.5×2= 3.2÷100= 0.31×0.2= 0.125×8=