Scientific Calculator Casio FX 991MS Manual
A comprehensive guide to using the Casio FX-991MS scientific calculator for various calculations and functions.
Basic Functions
- Power On/Off: Press the “ON” key to power the calculator on. To power off, press the “SHIFT” key followed by the “AC” key.
- Clear Screen: Press the “AC” button to clear the display.
- Decimal Point: Press the “.” key to input a decimal point in the number.
- Arithmetic Operations: Use the keys “+”, “-“, “×”, “÷” for addition, subtraction, multiplication, and division.
Advanced Functions
- Square Root: Press the “√” key for square root calculations.
- Power: Use the “xy” key to raise a number to a power.
- Trigonometric Functions: Access trigonometric functions like sine, cosine, and tangent by pressing the “SIN”, “COS”, or “TAN” keys, followed by the angle.
- Fraction: Use the “a b/c” key to input fractions.
Memory Functions
- Memory Store: To store a value in memory, press the “STO” key followed by one of the memory keys (M1, M2, M3).
- Memory Recall: To recall a stored value, press the “RCL” key followed by the corresponding memory key.
- Memory Clear: To clear the memory, press “SHIFT” followed by “RCL” and select the memory key.
Additional Features
- Statistics Mode: Access the statistics functions by pressing the “MODE” key and selecting “STAT” for regression and probability functions.
- Angle Units: Set the angle mode (degrees, radians, or grads) by pressing the “SHIFT” key followed by the “MODE” key.