60×40= 12×50= 10×52= 50×40=
27×10= 80×50= 60×70= 50×70=
50+36÷6= 80-20×3= 6×(50-30)=
+ = - = + = - =
240+160=
369-51=
40×30=
1-=
69÷3=
42×3=
0÷9×99=
+=