42÷6= 27÷3= 54+21= 18÷6= 3×9+9=
24÷4= 7×8= 9+2= 9÷9= 4×5-8=
81÷9= 40÷5= 8×3= 5×2= 72÷9+9=
7×5= 12÷3= 72-8= 1×8= ( )×6=54