36+26=2 87-68=9 35+=43
74-35=3 25+25=5 7+7+7=×
5×<27 4×<15
8×<33 25>×3 40>×7
□×□-□
□×□○□=□
2×0.8= 75﹣20= ×12= 42÷=
+= 1.5÷3= 501×100≈ ×0÷=