Find the two notches at the top of the calculator.
Insert a flat-head screwdriver into one of the notches and carefully pry open the top end of the case.
Locate where the case is still attached at the sides.
Insert the flat-head screwdriver into one side where the gap has widened.
Now gently pry apart the sides of the case.
Prying only one side will release the other side as well.
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