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The calculator automatically turns off after about 7 minutes if no key is pressed. OFF turns off the calculator. If the calculator is on, ON/C clears the entire calculation. +/- Key - Changes the displayed number from positive (+) to negative (-) or from negative (-) to positive (+). Minus -appears when the displayed value is negative. CE Key - Deletes the displayed number without losing any pending calculation. If a result is too big to show on the display, the calculator stops and displays E