Casio FX-991MS Scientific Calculator-AAA Grade

Fraction calculations

Combination and permutation

Statistics (STAT-data editor, Standard deviation, Regression analysis)

9 variable memories

Comes with a slide-on hard case

Number of Functions: 401

10 + 2 digits

10-digit mantissa + 2-digit exponential display.

Dot-matrix display

A high-resolution screen provides beautiful looking graphs every time.

Regular percent

Regular percentage calculations.

Multi-replay

Quick and easy recall of previously executed formulas for editing and re-execution.

Plastic keys

Designed and engineered for easy operation.

S-V.P.A.M. (Super Visually Perfect Algebraic Method)

All the features of the existing V.P.A.M. series plus a new 2-line display and a useful Replay function. All this helps to make mathematics easier to use and easier to understand than ever before.

STAT-data editor

Back-step viewing and editing of input data.

Calculator key layouts may vary depending on the type, brand, or region. Basic models include standard arithmetic keys, while scientific or financial calculators may have advanced functions like sin, log, or PV. Some keys perform multiple functions using SHIFT or 2nd. Also, decimal symbols and labels can differ by region or manufacturer. As a result, some formulas may not work correctly on all calculators due to missing functions or different key configurations.