This is the user's guide for the CASIO fx-55 PLUS calculator. It introduces the basic operations of the calculator, including initialization, safety precautions, turning power on and off, adjusting display contrast, key markings, reading the display, configuring the calculator setup, inputting expressions and values, toggling calculation results, basic calculations, remainder calculations, function calculations, calculation ranges, number of digits and precision, errors, replacing the battery, specifications and frequently asked questions.
This document is the official User's Guide for the Casio FX-55 PLUS calculator. It provides instructions on initializing settings, turning power on and off, adjusting display contrast, and removing the hard case. The guide details how to input expressions using natural calculation formula format or line notation.
| Auto Power Off Time | about 10 minutes |
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Press (3) (All) &) (Yes) to return all setup and data to initial defaults.
Replace the battery at least once every three years, or sooner if display readability does not improve after adjusting contrast.