225+475= 19.3-2.7= - = +1.4=
0.42÷0.7= 24× = 25×4×0= ×5÷ ×5=
×30= 0.5+ = =
= =
× ÷ × = 0.1×10÷0.1×10=
4÷ - ÷4= 101+103+105+……+199=
356+198= 2.5×4= 59×31≈
315÷3=