+ =
90﹣40=
1.25×4=
100÷25=
9+2﹣5=
÷ ×7=
47+53= 420÷70= 100﹣28.5= 0.03×8= 234﹣199=
50×80= 2.7÷0.9= += 1÷= ×=
90
70
48
52
54
(+)×9= 1.5×100= 99×0.8+0.8= 42=
+= 7﹣= ×= ÷=