CASIO Advanced Scientific Calculator Black S FX-991CW

Natural Textbook Display – Display equations, fractions, and symbols exactly as they appear in your textbook, improving understanding and reducing errors. High-resolution 4-tone display – Enhanced screen with quad-tone shading improves visibility and makes it easier to track your cursor when writing or editing expressions. Memory & Math Catalog – Store and recall up to 9 variables including integers, calculations, and functions. Memory persists for the duration of the session, a feature requested by educators. Access 47 constants, 40 transformations, advanced math functions, and more through an intuitive math catalog. 552 advanced features – perform numerical integration and differentiation, 4x4 matrix operations, spreadsheet-style data display, and more. QR Function & Durable Design – Scan your QR code and graph your results on ClassPad.net. Includes rounded keys and non-slip hard case for classroom or exam use.