3.07× 1.2 3.07 7.2÷1.67.2÷0.8
4.9÷1.44.9 3.5×0.60.35× 6
9+3=□
8+39= 69÷3= 400×9= 2.6+0.7=
18﹣2.5= + = ×5= 20× =
0.356×100= 4÷28= 15: = 98×12≈