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resetting casio fx 991ms calculator is easy but if you don't now the procedure then u face problem to reset. Reset Casio : Steps to reset Casio fx-991ms calculator-
1. Turn the calculator on with the ON button. There is no hardware reset button on the back.
2. Press 'SHIFT' then ‘MODE’ to enter Reset. A list of items which can be reset are shown.
3. Press 3 to select the Reset All options.
4. Press = to confirm the reset. The calculator has been reset at this point.
5. Press AC to return to normal calculation, or SHIFT AC to turn the calculator off.
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