Casio FX-115ES PLUS/FX-991ES PLUS C User's Guide

About this manual

This document serves as a comprehensive user manual for the Casio FX-115ES PLUS and FX-991ES PLUS C calculators. It details how to initialize the device, turn power on and off, adjust display contrast, and navigate key markings. The guide explains various calculation modes including COMP, CMPLX, STAT, BASE-N, EQN, MATRIX, VECTOR, INEQ, VERIF, DIST, and TABLE.

What's inside

• Initializing the Calculator
• Safety Precautions
• Turning Power On and Off
• Adjusting Display Contrast
• Specifying the Calculation Mode
• Inputting Expressions and Values
• Complex Number Calculations (CMPLX)
• Statistical Calculations (STAT)
• Equation Calculations (EQN)
• Replacing the Battery

Specifications

Frequently asked questions

What is the initial default calculation mode?

The initial default calculation mode is the COMP Mode.

How often should the battery be replaced?

You should replace the battery at least once every three years, even if operating normally.

What happens if you do not perform any operation for about 10 minutes?

The calculator will turn off automatically.