Casio fx-991CW Interactive Manual

Overview and Resources

This interactive manual provides detailed instructions for the Casio fx-991CW Scientific Calculator, part of the ClassWiz series. It aims to help users understand and utilize the calculator's extensive capabilities.

Additional Resources:

• Training videos covering key features.
• ClassWiz Practice materials, including Revision Mats and Cross Number Puzzles for Higher GCSE.
• General teaching resources with skills videos.

Navigating the Manual and Calculator

Learn how to interact with the manual and the device:

• Manual Navigation: Open slideshows, use calculator keys to access the guide, and return to the main screen via the mini calculator icon.
• Calculator Basics: The 'ON' key activates the calculator, defaulting to the last used application.

Core Calculation Functions

Master fundamental and advanced calculation techniques:

• Decimal Approximation: Convert calculation results to decimal format.
• Negative Numbers: Properly input negative values using the dedicated key.
• Variables: Utilize the 'x' key for variables and store values in memory (A-F, x, y, z).
• Reciprocal: Calculate the reciprocal (1/x) of numbers or expressions.
• Logarithms: Perform calculations with logarithms, including common log (base 10) and natural log (base e).
• Fractions: Enter and manage fractions using the intuitive fraction template.
• Roots: Compute square roots and nth roots.
• Exponents: Apply exponents and work with numbers in standard form.
• Trigonometry: Calculate trigonometric ratios and their inverse functions.
• Parentheses: Ensure correct order of operations (BIDMAS/BODMAS) by using parentheses.
• Mixed Numbers: Input and display numbers as mixed fractions.

Advanced Features and Tools

Explore specialized functionalities for complex tasks:

• Answer Memory: Recall and reuse the result of the last calculation.
• Time/Angle Conversion: Convert between decimal and sexagesimal (H:M:S) formats.
• Complex Numbers: Perform calculations involving imaginary numbers.
• Irrational Constants: Access and use constants like π and e.
• QR Code Generation: Create QR codes from calculations or tables for easy sharing or external access.
• Function Definition: Define and evaluate custom functions.
• Formatting: Adjust display formats for various types of output.

Calculator Management and Navigation Keys

Understand the purpose of key calculator management and navigation keys:

• Key Operations: Learn the functions of SHIFT, OK, BACK, SCROLL, EXECUTE, and ALL CLEAR for efficient operation.
• SETTINGS: Customize calculator preferences, including display output, angle units, and reset options.
• CATALOG: Access a comprehensive list of functions and operations not immediately visible on the keypad.
• TOOLS: Utilize additional tools and the UNDO function for error correction.
• HOME: Navigate to the main application screen to select modes such as Calculation, Statistics, Table, Equation Solver, and more.