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The Casio FX-991CW+ is a high-performance scientific calculator designed for students and professionals requiring advanced mathematical computation, specifically tailored for UK GCSE, A-Level, and Further Maths examinations. It offers a powerful suite of over 550 functions and a high-resolution Natural Textbook Display that mimics academic text formatting, though users should note that the device does not feature a backlit display for low-light environments.
| Model Part Number | fx-991CW |
|---|---|
| Brand | CASIO |
Yes, this model is fully compliant with current UK exam regulations for GCSE, A-Level, and Further Maths.
It uses a standard LR44 battery, which is easily accessible and widely available.
Yes, it supports advanced matrix and vector operations as part of its 550+ function library.
No, the FX-991CW+ does not have a backlit display.
Under normal usage conditions, the battery is designed to last approximately 3 years.
You can change between Degree, Radian, and Gradian modes via the setup menu settings.
Ensure the solar panel is receiving adequate light or check if the LR44 battery needs replacement.
Check your setup menu to ensure the input/output mode is set to 'Math/Math' rather than 'Math/Decimal'.
Perform a soft reset by pressing the 'Reset' button on the back of the device with a fine-pointed tool.
The calculator requires minimal setup and is ready for use out of the box. Ensure the LR44 battery is properly seated in the rear compartment to complement the solar panel. To maintain the device, keep the screen free of dust by wiping it gently with a dry, soft cloth. Avoid placing heavy objects on the screen, as the surface is not protected by a hard cover. Ensure the calculator is stored in a cool, dry place to protect the internal circuitry and maximize the 3-year estimated battery lifespan.
