

fx-991CW+ UK advanced scientific calculator
The Casio fx-991CW+ UK is the ultimate scientific calculator, and is allowed in every UK exam where a calculator can be used.
Recommended and approved for Key Stages 3, 4 and 5 (including GCSE Higher, GCSE Further Maths, AS/A Level Mathematics and Highers).
Interested in going graphic? Check out the fx-CG100.
- Description
- Specification
The fx-991CW+ UK is now even better and includes all the functionality you will find in an entry level scientific calculator with further improvements based on feedback directly from teachers and educators, improvements include:
- Ultimate Advanced calculator with new functionality such as; HCF, LCM and recurring decimals
- S<>D is easily accessible in one-press via the updated FORMAT key toggle
- Shortcuts are readily available in all menus by using the represented number keys for efficient navigation
- Standard Form conversion via [shift] FORMAT menu
- [shift] CATALOG provides quick access to most used functions
- A calculator designed and optimised for UK curriculums
You will continue to appreciate:
- Large and clear HD Natural Textbook Display, it shows mathematical expressions as they appear in textbooks
- 540+ functions including solving quadratics, inequalities and finding distributions
- Practical apps for teaching, learning and assessment
- Solar powered with battery back up and auto power off
- Intuitive key layout and menus, quick and easy to navigate to access more functionality
- 4-tone input display with an improved font
- Responsive keys that work when pressed at any angle
- A clip-on protective cover
- Free 3-year guarantee included
ClassWiz+ colours available on the fx-991CW+ include; deep black.
CALCULATION: arithmetic, trigonometry, logarithms, exponential, hyperbolic, equivalent ratio, number line
STATISTICS: mean, standard deviation, quartiles, regression
FUNCTIONS: table of values (2 functions),
SIMULATION: dice roll, coin toss, number line, unit circle
POWER: Battery
Video resources to get started
Upgrades to fx-991CW+ UK
This video looks at the functionality updates of the fx-991CW+ UK specific handset. This includes the use of shortcuts, new default settings, the introduction of consistent numeric functionality across the ClassWiz range, FORMAT key, scientific key usage and the new Shift Catalog menu.
Navigating CW+ efficiently
This video looks at how to navigate the fx-991 CW+ UK specific handset efficiently when performing calculations. This includes using Catalog functionality, shortcuts and the new Shift Catalog menu, which allows faster navigation. The principles of this video also apply to fx-83GT CW+ and fx-85GT CW+
Using the Format key on CW+ Scientific Calculators
This video looks at using the FORMAT key with ClassWiz+ handsets. This includes toggling the standard to decimal representation and using the full FORMAT menu to convert between fractions, decimals, recurring decimals, standard form and hours, minutes and seconds. The principles of this video apply to all CW+ calculators (fx-83GT CW+, fx-85GT CW+ and fx-991CW+ UK)
Resources
Casio offer a large suite of resources available for UK schools and cover teaching with calculators alongside the most popular subject topics for GCSE and A Level.
Register for your Calculator policy
To help you communicate calculator use in your school, we have developed some calculator policy templates for you to share with students and parents.
Examinations
The fx-991CW+ UK is permitted in GCSE & National 5 and A-level & Highers exams.
FAQs
How can we help? Visit our FAQ page to find out more about our calculators.
Full ClassWiz+ range
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