Evaluate the expression
|-81

  "8 ÷ 9 = 8/9" ;  (as a fraction).

Using a calculator:  "8÷9 =                                         "0.88888888888" ;   or; there may be a value such as:


"0.8888888888888889" ; There may be a "9" at the end;  that is; the calculator may round the value at the end.  

I suggest recalculating the value on your calcutator.

Please sure to "clear" your calculator.  Usually this can be done by pressing the [AC] button ;  & then.  the [C] or [CE] button.

Then, try:  "8 ÷ 9" again.  You should get value similar to the correct answer; such as: 

       "0.88888888888" ; 

or:  "0.8888888888888889" .

Otherwise, there is a possibility that the calculator itself is damaged or broken (e.g. got "stepped on" or "heavy objects" were placed; and the "calculator buttons"/other internal parts of the calculator were damaged and are now malfunctioning).

Hope this helps!