Pocket 991

A scientific and graphing calculator that shows you which keys to press. Pocket 991 brings together familiar EX- and CW-style scientific-calculator workflows, an independent CG50-style graphing calculator, and a large library of interactive tutorials for A-level Maths and Further Maths students. FOLLOW THE HIGHLIGHTED KEYS Choose a tutorial or ask how to do something. Clear requests start guidance; broader questions offer relevant operations. Follow a worked example on the calculator itself, then take over whenever you are ready. SCIENTIFIC CALCULATOR WORKFLOWS • Polynomial and simultaneous equations • Normal, binomial and Poisson probabilities • Statistics and regression • Matrix and vector calculations • Complex numbers • Numerical integration, differentiation and tables • Fractions, powers and calculator settings CG50-STYLE GRAPHING Explore calculations, graphs, tables, equations, statistics and distributions, matrices, recursion, conics, selected 3D workflows and more. The CG50 learning interface includes 234 worked tutorials with model-specific keys, menus and graphing steps. BUILT FOR YOUR PHONE AND TABLET Full-screen calculator layouts, tactile key feedback, an integrated question keyboard and optional dictation. Calculations and built-in tutorials work offline. Natural-language interpretation uses Apple Intelligence on compatible devices; availability depends on device, operating system, language and settings. Pocket 991 is an independent educational calculator and tutorial tool. It is not official calculator firmware and is not made by or affiliated with a calculator manufacturer. Some specialist modes, interfaces and numerical precision differ from physical calculators. Numerical calculus is supported; general symbolic algebra is not. This is a practice tool, not an examination device.