Scientific calculator CASIO ClassWiz fx-991CW — 252 functions, 2D/3D graphing

CASIO ClassWiz fx-991CW is a scientific calculator with an extensive set of built-in functions and graphing capabilities. Designed for mathematical, engineering and scientific tasks, it provides numeric computation, symbolic support for algebraic expressions, and the ability to display 2D and 3D graphs on a clear high-resolution display. The calculator supports trigonometrical, logarithmic, exponential and statistical operations, and is intended for use in classrooms, labs and fieldwork where precise calculations and visualisation of functions are required.

Advantages

The CASIO ClassWiz fx-991CW combines a compact form factor with a high-resolution screen that improves visibility of formulas and graphs. It offers a broad set of 252 functions covering arithmetic, algebra, calculus, matrices and statistics, and provides 2D/3D graphing to visualise relationships and solutions. The interface is built for straightforward entry of expressions and conversion between display formats, while the calculator’s calculation engine is optimised for reliable numerical results across a wide range of problems.

Suitable for

• High school and university students studying mathematics, physics or engineering
• Engineers and technicians performing calculations and visual checks of functions
• Laboratory work requiring statistical analysis and data processing
• Teachers preparing examples and demonstrations of mathematical concepts

Key specifications

• Number of functions: 252 built-in functions covering algebra, calculus, trigonometry and statistics
• Display: high-resolution LCD capable of rendering 2D and 3D graphs and multi-line expressions
• Graphing: 2D and 3D plotting for functions and parametric representations
• Calculation modes: numeric, fraction, complex numbers, matrices and vector operations
• Statistical features: regression analysis, standard deviation, permutations and combinations
• Power supply: integrated battery and energy-efficient operation
• Form factor: portable handheld design with tactile keypad for reliable input

How to use

Enter expressions directly using the keypad and confirm operations with the execute key to obtain immediate results. Switch between calculation modes via the mode menu to handle fractions, complex numbers, matrices or statistics as needed. For graphing, select the graph function, input the desired function or parametric equations, and use the navigation keys to adjust axes and view 2D or 3D representations. Use the memory and replay features to edit previous entries and perform stepwise calculations.

Usage recommendations

For classroom and exam environments, verify permitted features beforehand; when preparing coursework or demonstrations, use the graphing mode to illustrate function behaviour and combine statistical functions with matrix operations for data analysis. Maintain the calculator clean and replace batteries according to usage to ensure consistent display performance.