Casio fx-115ES PLUS, fx-991ES PLUS C Calculators User Guide

Casio’s latest and most advanced scientific calculator features new Natural Textbook Display and improved math functionality. FX-115ES PLUS has been designed to be the perfect choice for high school and college students learning General Math, Trigonometry, Statistics, Algebra I and II, Calculus, Engineering, Physics.

Important Information

Sample Operations

Initializing the Calculator

Safety Precautions

Handling Precautions

Removing the Hard Case

Turning Power On and Off

Adjusting Display Contrast

Key Markings

Reading the Display

Using Menus

Specifying the Calculation Mode

Configuring the Calculator Setup

Inputting Expressions and Values

Recurring Decimal Calculations

Toggling Calculation Results

Basic Calculations

Remainder Calculations

Prime Factorization

Function Calculations

Complex Number Calculations (CMPLX)

Using CALC


Statistical Calculations (STAT)

Base-n Calculations (BASE-N)

Equation Calculations (EQN)

Matrix Calculations (MATRIX)

Creating a Number Table from Two Functions (TABLE)

Vector Calculations (VECTOR)

Inequality Calculations (INEQ)


Distribution Calculations (DIST)

Scientific Constants

Metric Conversion

Calculation Ranges, Number of Digits, and Precision


Before Assuming Malfunction of the Calculator…

Replacing the Battery


Frequently Asked Questions

Categories: Calculators