Casio FX-100S/FX-115S/FX-570S/FX-991S User Manual

About this manual

This manual introduces the Casio FX‑100S, FX‑115S, FX‑570S and FX‑991S scientific calculators, describing how to start calculations, select calculation modes (COMP, SD, LR, CMPLX, BASE‑N) and set angle units (DEG, RAD, GRA). It also details the key functions, memory operations, and special display formats such as hexadecimal, sexagesimal and scientific notation.

Additional sections cover statistical and regression calculations, complex number handling, and hardware information including power source, display capabilities (up to 30 digits) and protective handling of the calculator and its hard case.

What's inside

• Operational Flow
• Calculation Modes
• Key Functions
• Display Modes
• Statistical Calculations
• Complex Number Calculations
• Regression Analysis
• Specifications
• Hard Case Handling

Specifications

Frequently asked questions

How do I change the angle unit mode (DEG, RAD, GRA)?

Press the key two times to open Mode Specification Menu No. 2, then press the number key that corresponds to the desired unit (DEG, RAD, or GRA).

How can I select a calculation mode such as COMP, SD, LR, CMPLX or BASE‑N?

Press the 5 key to open Mode Specification Menu No. 1, then press the number key that corresponds to the desired calculation mode.

How many digits can the calculator display before switching to exponential format?

It can display up to 30 digits; values larger than 9,999,999,989 automatically switch to exponential notation.