Casio fx-991EX User Manual

QUICK START GUIDE
fx-991EX
www.casioeducation.com
The fx-991EX “ClassWiz” features a high-resolution
display, making it easier to view formulas and symbols.
This remarkable screen can display between 2-6 times
as many characters as other scientic calculators, yet
still runs on solar power.
Use the W key to turn the calculator on, and press
qC(OFF) to power the unit down.
The icon-based menu, accessible via the p key,
allows easy navigation of features using the arrow keys
and the number keys or the Q shortcuts.
The o key can be used like Backspace in a word
processor to delete the character(s) left of the cursor.
The symbols printed on the keys use Natural Textbook
Display™ notation, similar to that found in textbooks.
This makes input of expressions fast and easy.
The n key toggles your calculation results between
Standard (exact) and Decimal forms.

Casio fx-991EX Specifications

General

Type	Scientific
Cover	No
Form factor	Pocket
Control type	Buttons
Product color	Black, White
Battery type	LR44
Power source	Battery/Solar
Number of batteries supported	1
Digits	16 digits
Display type	LCD
Display resolution	192 x 63 pixels
Display number of lines	2 lines
Display number of characters	16
Storage media type	-
Operation	552
Conversion between	Decimal, Fraction, Percent
Convert angles from degrees to	Gradian, Radian
Random number/integer generator	Yes

Weight and Dimensions

Depth	165.5 mm
Width	77 mm
Height	11.1 mm
Weight	90 g

Summary

Introduction to the Casio fx-991EX

Key Calculator Features and Navigation

Overview of the calculator's display, power, menu, and input features.

Understanding the Main Menu Icons

Details the function of each icon in the calculator's main menu.

CALCULATE Mode

Natural Textbook Display and Basic Operations

Demonstrates entering fractions, mixed numbers, radicals, and basic arithmetic.

Calculus and Equation Solving

Explains how to perform summation, derivatives, integrals, and use the SOLVE command.

Unit Conversions and Engineering Notation

Covers performing unit conversions and using engineering/scientific notation.

COMPLEX Mode

Complex Number Arithmetic and Forms

Guides on performing operations on complex numbers and converting between forms.

MATRIX Mode

Matrix Operations and System Solving

Details defining matrices, performing arithmetic, and solving systems of equations.

VECTOR Mode

Vector Operations and Angle Calculation

Covers defining vectors, performing arithmetic, dot products, and finding the angle.

STATISTICS Mode

1-Variable and 2-Variable Statistics

Explains data entry and calculations for 1-variable and 2-variable statistics.

Frequency Tables and Regressions

Guides on using frequency tables and performing regression analysis.

DISTRIBUTION Mode

Probability Distribution Calculations

Demonstrates calculating probabilities for binomial and inverse normal distributions.

SPREADSHEET Mode

Spreadsheet Basics and Formula Entry

Introduces spreadsheet features, cell referencing, and formula entry.

Populating Cells and Performing Calculations

Guides on filling cells, copying formulas, and performing calculations like sum and mean.

Combining Spreadsheet and Conversion Features

Shows how to combine spreadsheet functions with unit conversions for practical applications.

TABLE Mode

Generating and Customizing Function Tables

Explains how to create and customize tables for single or multiple functions.

Analyzing Function Behavior with Tables

Demonstrates using tables to analyze function roots, intersections, and behavior.

EQUATION/FUNC Mode

Solving Simultaneous and Polynomial Equations

Guides on solving systems of equations and polynomial equations, including complex roots.

INEQUALITY Mode

Solving Polynomial Inequalities

Explains how to solve polynomial inequalities and interpret their solutions.