To power off an Orpat calculator, you typically need to locate the power button, which is usually labeled as "ON/OFF" or with a similar symbol. Press and hold this button for a few seconds until the display turns off or the calculator shuts down. Some Orpat calculators may also have an automatic power-off feature after a period of inactivity to conserve battery life.
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press 2and 3 with on/ac switch for 2-4 sec and release on/ac then 2,3 the calc. is off
On normal calculator, press 'Off'. If your calculator doesn't have this button, the calculator will turn off automatically after some time. On scientific calculator, press 'shift' and press 'AC'. (depends on your version of the calculator)
press / * % and one time check & two times correct button
press the reset button on the back of the calculator that worked for me
Don't work it out with your calculator.