CM4

 $\sqrt{121}$   $-\ 40\div8=$  

 $6^2\ -\ 7^2+8=$  

 $28\div7-\ 6^2\div9$  =

 $\left(\sqrt{25}\right)\left(\sqrt{81}\right)=$  

7(9) - 11(3)=

2(5+8) - 5(9-6)=

 $32\div8-23=$  

 $11\times5+\sqrt{100}=$  

 $66\div11-35\div7=$  

 $54\div6-56\div8=$