√81 = 9,

so 92 = ...?

 

42 = 16,

so √16 = ...?

 

40 ÷ 8 = 5,

so 40 ÷ 5 = ...?

 

8 x 9 = 72,

so 72 ÷ 9 = ...?

 

12 + 11 = 23,

so 23 - 11 = ...?

 

16 - 9 = 7,

so 7 + 9 = ...?