# Introduction to basic functions of scientific calculator (casio fx-991ms)

TLDRThis video introduces the Casio fx-991ms scientific calculator, covering basic operations like switching it on, using degree mode, and navigating through different modes. It explains how to clear memories and enter complex numbers. The video also touches on functions like inverse, square root, power, and logarithmic calculations. It mentions the use of variables and the potential for further detailed exploration in upcoming videos.

### Takeaways

- π The ON key is located at the top right corner to switch on the Casio fx-991ms calculator.
- π The default mode is degree mode (D), and up to 79 characters can be entered, with a visual indicator for remaining space.
- π The AC key clears all entries, while the DEL key clears characters one by one.
- π‘ The SHIFT key activates functions associated with yellow-colored keys, such as clearing memories.
- π The MODE key is used to switch between different calculator modes, including COMP (normal calculations) and CMPLX (complex number calculations).
- π Pressing MODE multiple times accesses additional modes like SD, REG, BASEn, EQN, MAT, VCT, DEG, RAD, GRA, Fix, Sci, and Norm.
- π’ In Fix mode, you can set the number of decimal places, in Sci mode the number of significant digits, and in Norm mode, choose between exponential and decimal display formats.
- π The ALPHA key is used with pink-colored keys to insert variables like A, B, C, D, E, F, X, and Y.
- π The x inverse key is used to find the inverse of a number, and the a b/c key can perform arithmetic operations with fractions.
- π The square root and x square keys are used to calculate squares and cubes, while the ^ key is for higher or fractional powers.
- π The Log key provides base 10 logarithms, ln shows natural logarithms, and 10^x is used to calculate powers of ten.
- π’ The EXP key, when used with the shift key, provides the value of pi, and the = button can be used to calculate percentages.
- π The RCL key recalls stored values, and the STO key stores them, with the Comma and Memory + keys having additional functions to be explained later.
- π To switch off the calculator, press the shift and AC keys simultaneously.

### Q & A

### How do you turn on the Casio fx-991ms calculator?

-To switch on the calculator, you press the ON key located at the top right corner.

### What is the default mode on the Casio fx-991ms calculator?

-The default mode is degree mode, indicated by the 'D' key.

### How many characters can you enter on the Casio fx-991ms calculator?

-You can enter a maximum of 79 characters.

### What does the black box on the calculator display indicate?

-The black box indicates that only six more characters can be entered.

### What is the function of the SHIFT key on the calculator?

-The SHIFT key is used in combination with other keys to access additional functions.

### How do you clear all entries on the calculator?

-Press the AC key to clear all entries.

### What mode is entered by pressing MODE key and 1?

-By pressing MODE and 1, you enter into COMP mode, which is used for normal calculations.

### How do you clear the CMPLX mode?

-Press SHIFT, MODE, 2, and then '=' to clear the CMPLX mode.

### What does the ALPHA key do on the Casio fx-991ms calculator?

-The ALPHA key allows you to insert variables A, B, C, D, E, F, X, Y.

### How do you find the inverse of a number on the calculator?

-To find the inverse of a number, write the number, press the x inverse key, and then press '='.

### What is the purpose of the square root key on the calculator?

-The square root key is used to calculate the square root of a number by pressing it before entering the number and then pressing '='.

### How do you calculate a percentage on the calculator?

-To calculate a percentage, use the '=' button.

### What is the EXP key used for on the Casio fx-991ms calculator?

-The EXP key is used to calculate exponents. With SHIFT, it gives the value of pi.

### How do you switch off the Casio fx-991ms calculator?

-To switch off the calculator, press SHIFT and then AC key.

### Outlines

### π± Casio fx991ms Calculator Introduction

This paragraph introduces the Casio fx991ms calculator, explaining how to power it on using the ON key. It mentions the default degree mode (D) and the character limit of 79, with a visual indicator for remaining characters. The script covers the use of keys like AC for clearing the screen, DEL for deleting characters, and the SHIFT key for accessing additional functions. It also details how to clear memories and return to default mode using the ALL (3) key. The MODE key is introduced for entering different modes like COMP for standard calculations and CMPLX for complex numbers. The video promises further explanations of the MODE key's functions in upcoming videos, including accessing SD, REG, BASEn, EQN, MAT, VCT, DEG, RAD, GRA, Fix, Sci, and Norm modes. The Norm mode is explained briefly, showing how to set the display format.

### π’ Basic Operations and Variables

The second paragraph focuses on basic operations and the use of variables on the calculator. It explains how to find the inverse of a number, convert between decimal and fraction forms, and perform arithmetic with fractional numbers using the b/c key. The paragraph also introduces the use of the ALPHA key for accessing variables A to M, which will be discussed in later videos. Additionally, it mentions the functionality of green keys in Base Mode for logic functions and base conversions, providing examples of how to use the calculator for these operations.

### π Advanced Mathematical Functions

This paragraph delves into more advanced mathematical functions available on the calculator. It covers the use of the square root key, both for square and cubic roots, and the x square key for raising numbers to any power, including fractional powers using the ^ key. The paragraph also explains the Log and ln keys for calculating logarithmic values, and the 10^x and e^x keys for exponential calculations. The video provides specific examples of how to use these keys, including how to obtain the value of pi and the mathematical constant e.

### π Trigonometric and Hyperbolic Functions

The final paragraph discusses the calculator's capabilities for trigonometric and hyperbolic functions, including keys for sin, cos, and tan, as well as their inverse functions. It mentions the use of the degree, minutes, and seconds key, and the EXP key for exponentiation and percentage calculations. The paragraph also covers permutation and combination calculations, factorials, and how to power off the calculator. The video concludes by promising more detailed explanations of these functions and additional problems in future videos, encouraging viewers to like, share, and subscribe.

### Mindmap

### Keywords

### π‘ON key

### π‘Degree mode

### π‘SHIFT key

### π‘MODE key

### π‘COMP mode

### π‘CMPLX mode

### π‘ALPHA key

### π‘x inverse key

### π‘Square root key

### π‘Log

### π‘EXP key

### π‘RCL key

### Highlights

Introduction to the Casio fx-991ms scientific calculator

How to switch on the calculator using the ON key

Default Degree mode (D) and character limit explanation

Use of the AC and DEL keys for clearing calculator

SHIFT key functions and its color-coded keys

Clearing memories with MODE and SHIFT keys

Entering COMP mode for normal calculations

Accessing CMPLX mode for complex number calculations

Clearing CMPLX mode and default mode functions

Exploring MODE key functions for SD, REG, BASEn Modes

Fix, Sci, and Norm Modes for number display formats

ALPHA key functions and variable insertion

Green keys for Base Mode in logic functions and conversions

Finding the inverse of a number using the x inverse key

Converting decimals to fractions using a b/c key

Square root and higher power calculations

Logarithmic functions and their natural counterparts

Trigonometric and inverse trigonometric functions

Recall (RCL) and Store (STO) functions

EXP key for exponents and value of pi

Finding permutation and combination using multiplication and division keys

Calculating factorials with the X inverse key

Switching off the calculator with SHIFT and AC keys