Casio FX-82ES PLUS User manual

CASIO CALCULATOR
fx-82ES PLUS
fx-85ES PLUS
fx-350ES PLUS
User's manual

Important information
The images and pictures (such as key labels) in this user's manual are for illustrative
purposes only and may differ slightly from the actual things they represent.
The content of this manual is subject to change without notice.
In no event shall CASIO Computer Co., Ltd. be liable to anyone for any special, collateral,
accidental or consequential damages that may arise in connection with or as a result of
the purchase or use of this product and items not belonging to it. In addition, CASIO
Computer Co., Ltd. takes no responsibility for any complaints from any third party
arising out of the use of this product and related items.
Keep this user’s manual on hand for future use.
Examples of operations
Examples of operations in this manual are indicated by this icon Unless explicitly
stated, all sample operations assume that the calculator is in its original default setting.
Use the procedure under "Calculator Initialization" to return the calculator to its original
default settings.
Calculator initialization
Perform the following procedure to initialize the calculator and return the calculation
mode, including configuration, to their original settings. Note that this operation will
erase all data from the calculator memory.
Safety notice
•Keep batteries out of the reach of small children.
•Use only the batteries specified for this calculator in this manual.

Usage notice
•Even if the calculator operates normally, replace the battery at least every three
years (LR44 (GPA76)), every two years (R03 (UM-4)), or every year (LR03 (AM4)). A
discharged battery may leak, causing damage and malfunction to the calculator.
Never leave a discharged battery in the calculator. Do not attempt to use the
calculator when the battery is completely discharged (fx-85ES PLUS).
•The battery supplied with this calculator slowly discharges during shipping and
storage. For this reason, an earlier replacement than usual may be required.
•Do not use an Oxyride battery or any other type of nickel primary battery with
this product. Incompatibilities between such batteries and product specifications
may result in shorter battery life and product malfunction.
•Avoid using and storing the calculator in locations with temperature extremes,
high humidity, and dust.
•Do not subject the calculator to excessive shock, pressure or bending.
•Never attempt to disassemble the calculator.
•Clean the outside of the calculator with a soft and dry cloth.
•When disposing of the calculator or batteries, do so in accordance with the laws
and regulations in your area.
•The company and product names used in this manual may be registered
trademarks or trademarks of their respective owners.
Removing the hard cover
Before using the calculator, slide the hard cover down to remove it, and then attach it to
the back of the calculator as shown in the picture below.
How to turn On & Off
Press ON to turn on the calculator.
Press SHIFT + AC (OFF) to turn off the calculator.

Automatic shutdown
If you do not perform any operation on the calculator, it will turn off automatically after
about 10 minutes. If this happens, press the ON key to return the calculator to the on
state.
Adjust the display contrast
The following operation key displays the contrast adjustment screen:(CONTRAST)
. Next, use the arrows to adjust the contrast. When you
reach the desired setting, press AC.
Important: If the display contrast setting does not improve its readability, it probably
means that the battery is low. Replace the battery.
Key labels
Press the SHIFT or ALPHA key and then press the next key to perform an alternative
function for the second key. The alternative function is indicated by the text above the
key. The following table explains the meaning of the different colors for alternative key
functions.
If the text color is above the key:
It means:
Yellow
Press SHIFT and then the key to perform
the function.
Red
Press ALPHA and then press the key to
insert the appropriate variable, constant
or symbol.
Alternative function
Key function

Reading the display
The calculator display shows the expressions you have entered, the results of the
calculations, and various indicators.
•If the indicator appears to the right side of the calculation result, it means that
the displayed calculation result continues to the right. Use the arrows to move
the display of the calculation result.
•If the indicator appears to the right of the inserted expression, it means that
the displayed calculation continues to the right. Use the arrow keys to move the
display of the inserted expression. Be aware that if you want to move the
inserted expression while the indicators and are displayed, you will need to
press AC first and then use the arrows to move.
Indications on the display:
Indicator:
Significance:
The keyboard has been moved by pressing the SHIFT key. Pressing any
key will scroll back to the basic keyboard and this indicator will
disappear.
The alpha input mode has been set by pressing the ALPHA key.
Pressing any key exits the alpha input mode and this indicator will
disappear.
M
The value is stored in independent memory.
STO
The calculator is ready to insert a variable name so that it can add its
value. This indicator appears when you press SHIFT + RCL (STO).
RCL
The calculator is ready to insert a variable name so that it can recall its
value. This indicator appears when you press RCL.
Inserted expression
Result of the calculation
Indicators

STAT
The calculator is in STAT mode.
Angular units are degrees.
Angular units are radians.
Angular units are gradients.
FIX
The number of decimal places is effective.
SCI
The number of valid digits is effective.
Math
The Natural View format is selected.
Calculation history memory data is available and can be played or
there is more existing data above / below the screen.
Disp
The display is just showing the intermediate result of the multi-
expression calculation.
Important: For calculations that take a long time, the display can only show the above
indicators (without any value) while the entered calculation is running internally.
Menu
Some of the calculator operations are performed from the menu. For example, pressing
MODE or HYP displays a menu of available functions.
The following operations that you should use to navigate between menus.
•You can select a menu item by pressing the number key that corresponds to the
number on the left side of the menu screen.
•Use the UP and DOWN arrows to switch between menus.
•To close the menu without selecting anything, press AC.
Determining the calculation mode
To perform the following operation
Perform these key operations:
General calculations
MODE + 1 (COMP)
Statistical and regression calculations
MODE + 2 (STAT)
Generate a table of numbers based on
an expression
MODE + 3 (TABLE)
Note: The initial standard calculation mode is COMP mode.

Calculator configuration settings
First, perform the following key operations to display the setup menu: SHIFT + MODE
(SETUP). Next, use the arrow keys and number keys to configure the selected setting.
The underlined setting values are the original default settings.
1. MthlO (Natural View)– displays fractions,
irrational numbers, and other expressions as if
they were written on paper.
MthlO: Selects MathO or LineO. MathO displays
input expressions and calculation results as if they were written on paper.
LineO displays input expressions just like MathO but displays the calculation
results in Line View.
2. LinelO (Line View) displays fractions and other expressions in a single line.
Note: The calculator switches to Line View automatically whenever you enter STAT
mode. In this manual, the MATH symbol next to the sample operation means Natural
View (MathO), while the LINE symbol means Line View.
3. Deg
4. Rad
5. Gra
Specifies degrees, radians, or gradients as angular units for the input value and the
display of the calculation result.
Note: In this manual, the DEG symbol next to the sample operation means degrees,
while the RAD symbol means radians.
6. Fix
7. Sci
8. Norm
Specifies the number of digits to display the result.
FIX – The value you select (from 0 to 9) determines the number of decimal places to
display the calculation results. The results of the calculations are rounded to the
specified decimal place.
SCI – The value you select (from 1 to 10) determines the number of significant digits to
display the calculation results. The results of the calculations are rounded to the
specified decimal place.
NORM – Selecting from one of the two setting options (Norm1, Norm2) determines the
range in which the results will be displayed in non-exponential form. Outside the
specified range, the results will be displayed exponentially.

Specifies either a mixed fraction (ab / c) or
a false fraction (d / c) to display the
fractions in the calculation results.
Specifies whether to display the FREQ
(frequency) column on the Stat Editor
screen in STAT mode.
Specifies whether to display a decimal
point or a decimal comma for decimal
places. The decimal point is always
displayed when pasting.
Note: When a decimal point is selected
for decimal places, the separator for
multiple results is a comma. When a
decimal comma is selected for decimal
places, the separator is a semicolon.
Adjusts the contrast of the display.
Initialization of settings
To initialize the calculator, perform the following action, which returns the calculation
mode to COMP and returns all other settings, including menu settings, to default values.
Entering expressions and values
Basic rules for entering
Calculations can be entered in the same form as they are written. When you press =, the
priority in the calculation order will be evaluated automatically and the result will appear
on the display.
Inserting closing parentheses is required for sin, sinh, and other functions that include
parentheses.
Multiplication symbols can be omitted when they appear right before open parentheses,
before functions that include parentheses, and before variables.
The closing parenthesis just before the operation = can be omitted.
If the calculation is longer than the screen width during insertion, you can move using
the arrows.
If the cursor changes to , it indicates that there are less than 10 places left to enter
numbers. End the entered expression and press =.

Inserting with Natural View
Selecting Natural View allows you to insert and display fractions and certain functions
just as they are written in the textbook.
If you enter too many functions, further input may be impossible. If this happens, divide
the calculation into several parts and calculate each one separately.
When you press = and get the result, part of the expression may be cut. If you need to
see the whole expression, press AC and use the arrows to scroll through the expression.
Using values and expressions as arguments
The value or expression that you entered can be used as argument functions.
Overwrite input mode (Line view only)
You can select either insert or overwrite as the input mode. Use SHIFT + DEL (INS. To
switch between modes).
Correction and removal of an expression
To delete an individual character or function: Move the cursor to the right of the
character or function you want to delete, then press DEL.
To insert a character or function: Use the arrow keys to move the cursor to the location
where you want to insert and then paste.
To clear all inserted calculations: Press AC.
Switching calculation results
When Natural View is selected, each press of toggles the currently displayed
calculation result between the fraction, square root form and the decimal form.
Basic calculations
Calculations with fractions
The method for inserting fractions is different depending on whether you are using
Natural View or Line View.
Mixing fractions and decimal values in a calculation when Line View is selected will cause
the result to be displayed as a decimal value.
Fractions are displayed in the results after they are truncated.

Calculations with percentages
By entering a value and pressing the entered value becomes a percentage.
Calculations with degrees, minutes, seconds (Sexagesimal)
By pressing you can switch between sexagesimal and decimal. Value input format
for the sexagesimal system: degrees , minutes , seconds . You must always
enter a value for degrees and minutes, even if they are zero.
Multiple expressions
You can use a colon (:) to join two or more expressions, and then evaluate those
expressions from left to right by pressing =.
Using the technical form of numbers
A simple key operation (ENG) can be used to convert the displayed value to the technical
state.
History of calculations
In COMP mode, the calculator remembers up to approximately 200 bytes of the latest
calculation data. Use the UP and DOWN arrows to scroll through the contents of the
history memory.
The contents of the calculation history memory are cleared whenever you press ON,
change to another calculation mode, change the displayed format, or perform any reset
operation.
Repetition
While the result of the calculation is shown on the display, you can press the RIGHT and
LEFT arrows to edit the expression used for the previous calculation.
Memory of the last result (Ans)
The last received calculation result is stored in Ans (last result memory). The memory
contents of the last result are updated whenever a new calculation result is displayed.

Variables (A, B, C, D, E, F, X, Y)
Your calculator has eight preset variables. You can assign a value to them and also use
the variables in calculations.
Independent memory
You can add or subtract the results of calculations from independent memory. The
indication "M" on the display means that a non-zero value is stored in the independent
memory.
Delete content M: SHIFT + RCL (STO) M + (M)
Add result: M +
Subtract result: M-
Call up content M: RCL + M + (M)
The variable M is used for independent memory.
Erase the contents of all memories
The last result memory, independent memory and the contents of all variables are
retained even if you press AC, change the mode, or turn off the calculator. If you want to
clear the contents of all memories, perform the following procedure.
SHIFT + 9 (CLR) + 2 (Memory) = (Yes)
Distribution to prime factors
In COMP mode, you can decompose positive integers up to 10 digits to prime factors up
to three digits using the operation: SHIFT + (FACT). When you perform a
decomposition on a prime factor that contains a factor that is a prime number with
more than three digits, the part that cannot be decomposed will be enclosed in
parentheses on the display.
Function calculations
Using functions may slow down the calculator. Do not perform any further operations
while waiting for the calculation to be displayed. To interrupt the ongoing calculation,
press AC.

Statistical calculations (STAT)
To start statistical calculations, perform the key operation MODE + 2 (STAT) to enter
STAT mode, and then use the screen that appears to select the type of calculations you
want to perform.
Data entry
Use the Stat editor to enter the data. To display the Stat Editor, perform the following
key operation SHIFT + 1 (STAT) + 2 (Data).
The stat editor provides 80 lines for embedded data if only column X is used, 40 lines
when columns X and FREQ are used, or columns X and Y, or 26 lines when columns X, Y,
and FREQ are used.
Use the FREQ column to enter the amount (frequency) of the same data items. The FREQ
column display can be turned on or off using the Stat format setting in the setup menu.
Important:
All data currently entered in the Stat editor is deleted each time you exit STAT mode,
switch between the calculation type of one variable and a pair variable or change the
Stat format setting in the settings menu.
The following operations are not supported by the Stat editor: M +, SHIFT + M + (M-),
SHIFT + RCL (STO). Pol, Rec, and multiple expressions also cannot be inserted using the
Stat editor.
To change data in a cell: In the Stat Editor, move the cursor to the cell that contains the
data you want to change, insert the new data, and then press =.
To delete a line: In the Stat Editor, move the cursor to the line you want to delete and
then press DEL.
To insert a line: In the Stat Editor, move the cursor to a line where you want to insert,
and then perform a key operation: SHIFT + 1 (STAT) + 3 (Edit) +1 (Ins).
Delete all contents of the Stat editor:Perform a key operation: SHIFT + 1 (STAT) + 3
(Edit) + 2 (Del-A).
Obtaining statistical values from input data
To obtain statistical values in the Stat editor, press AC and call up the statistical variable
you require.

Calculation of estimated values
Based on the regression formula obtained in the statistical calculation of the paired
variable, the expected value of y can be calculated for a given value of x. The
corresponding value of y (two values of x1 and x2, in the case of quadratic regression)
can also be calculated for the value of y in the regression formula.
Calculations of regression coefficient, correlation coefficient and estimated value can
take a long time due to large amount of data.
Creating a numeric table from a function (TABLE)
Perform the following steps to create a numeric table:
1. Press MODE + 3 (TABLE) to enter the TABLE mode.
2. Insert a function using a variable x.
Be sure to insert the variable x (ALPHA +) (X) when generating the numeric tables. Any
variable other than x is treated as if it were a constant.
Pol and Rec cannot be inserted into a function.
3. In response to the prompts, enter the values you want to use by pressing = after each
one:
Start? – enter the initial value for x.
End?– venter the final value for x. Make sure that the final value is always higher than
the initial value.
Step?– Enter the step value. The step specifies how much the initial value should be
incrementally increased when generating the numeric tables.
Pressing AC while the numeric table screen is displayed returns you to the function entry
screen in step 2.
You can only use the numeric table screen to view values. The contents of the table
cannot be edited. The numeric table generation operation causes the contents of the
variable x to change.
The function you enter to generate a table is cleared each time you display the setup
menu in TABLE mode and switch between Natural View and Line View.

Calculation range and accuracy
Number of digits for internal calculations - 15 digits.
Accuracy - in general, ± 1 in tenth place for simple calculation. The accuracy for
exponential display is ± 1 for the last valid digit. In the case of consecutive calculations,
the errors are accumulated.
Errors
The calculator displays an error message whenever an error occurs during the
calculation for any reason. There are two ways to stop displaying an error message:
Pressing the RIGHT or LEFT arrow displays the location of the error, or pressing AC
clears the message and calculation.
Error messages:
Math ERROR
Problem:
•The intermediate result or final result of the calculation you are performing
exceeds the allowable calculation range.
•The input exceeds the permitted range for the input value (especially when using
functions).
•The calculation you are performing contains an illegal math operation (such as
division by zero).
Solution:
•Check the entered values, reduce the number of digits, and try the calculation
again.
•When using an independent memory or variable for a function argument, make
sure that the value in memory or the value of the variable does not exceed the
allowed range for that function.

Stack ERROR
Problem:
•The calculation you are performing has exceeded the capacity of the numeric or
stack memory.
Solution:
•Simplify the calculation expression so that the calculation does not exceed the
capacity of the stack memory.
•Try to divide the calculation into two or more parts.
Syntax ERROR
Problem:
•The problem is in the form of a calculation that you perform.
Solution:
•Make the necessary corrections.
Insufficient MEM ERROR
Problem:
•Arranging parameters in TABLE mode caused more than 30 x values to be
generated for the table.
Solution:
•Narrow the calculation range of the table by changing the start value, end value,
and step value. Then try again.
Argument ERROR
Problem:
•A decimal argument has been entered for the random number function.
Solution:
•Enter only integers as an argument.

Before you anticipate a calculator failure …
Whenever an error occurs during the calculation or when the calculation results are not
what you expected, perform the following steps. If one step does not resolve the issue,
go to the next step.
Be aware that you should make special copies of important data before performing
these steps.
1. Check the calculated expression to make sure that it does not contain any errors.
2. Make sure you are using the correct mode for the type of calculation you are
trying to perform.
3. If the above steps do not resolve your issue, press the ON key. This runs a
procedure on the calculator that checks if the calculation functions are working
correctly. If the calculator detects any abnormalities, it automatically initializes
the calculation mode and clears the contents of the memory. For details on
initializing the settings, see "Calculator Configuration Settings".
4. Initialize all modes and settings by performing the following operation:
SHIFT + 9 (CLR) + 1 (Setup) = (Yes)
Battery replacement
A low battery results in a dimmed display even when the contrast is adjusted, or a
number error that appears on the display immediately after you turn on the calculator.
If this happens, replace the battery with a new one.
Important: Removing the battery clears all the contents of the calculator's memory.
1. Press SHIFT + AC (OFF) to turn off the calculator. To prevent the calculator from
turning on accidentally, place the hard cover on the front.
2. Remove the cover as shown in the figure, and replace the battery, making sure
that the plus and minus sides are in the correct position.
3. Place the cover again.
4. Initialize the calculator: ON + SHIFT + 9 (CLR) + 0 (ALL) = (Yes).
Screw
Scre

Do not skip the previous step!
Specifications
Power supply:
Fx-82ES PLUS: battery AAA R03 (UM-4) x 1
Fx-350ES PLUS: battery AAA LR03 (AM4) x 1
Fx85ES PLUS: Built-in solar battery, button battery LR44 (GPA76) x 1
Approximate battery life:
Fx-82ES PLUS: 17 000 hours (when the blinking cursor is displayed continuously)
Fx-350ES PLUS: 8 700 hours (during continuous operation)
Fx85ES PLUS: 3 years (with 1-hour operation per day)
Power consumption:
0,0002 W (fx-82/350ES PLUS)
Operating temperature:
0 °C - 40 °C
Dimensions:
Fx-82/350ES PLUS: 13,8 (H) x 80 (W) x 162 (D) mm
Fx85ES PLUS: 11,1 (H) x 80 (W) x 162 (D) mm
Approximate weight:
Fx-82/350ES PLUS: 100 g incl. battery
Fx85ES PLUS: 95 g incl. battery

Q & A
How can I insert and display results in the same way I used for a model that did
not have a Natural View?
Perform the following key operation: SHIFT + MODE (SETUP) + 2 (LinelO).
What is the difference between the memory of the last result, the independent
memory and the memory of the variable?
Each of these types of memory acts as a "stack" for temporarily storing an individual
value.
Last Result Memory: Stores the result of the last calculation. Use this memory to transfer
the result of one calculation to another.
Independent memory: Use this memory to summarize the results of multiple counting.
Variable memory: This memory is useful if you need to use the same value multiple
times in one or more calculations.
When I perform a function calculation, why do I get a calculation result that is
completely different from the older CASIO calculator model?
For a Natural View model, the argument of a function that uses parentheses must be
followed by closed parentheses. Failure to press parentheses after an argument to
enclose parentheses can cause unwanted values or expressions to be included as part
of the argument.

Důležité informace
Zobrazení a ilustrace (jako např. označení kláves), které jsou v tomto uživatelském
manuálu, slouží pouze pro ilustrační účely a mohou se poněkud lišit od skutečných věcí,
které představují.
Obsah tohoto manuálu podléhá změnám bez upozornění.
CASIO Computer Co., Ltd. Není v žádném případě odpovědná vůči komukoli za jakýkoli
případ speciálního, kolaterálního, náhodného nebo následného poškození, které může
vzniknout ve spojení s nebo jako důsledek koupě či používání tohoto produktu a
položek, které k němu nepatří. Kromě toho, CASIO Computer Co., Ltd. Nepřebírá žádnou
zodpovědnost za jakékoli stížnosti od kterékoli třetí strany vyplývající z užívání tohoto
produktu a položek s ním spojených.
Ponechte si veškerou uživatelskou dokumentaci při ruce pro budoucí použití.
Ukázky operací
Ukázky operací v tomto manuálu jsou označeny touto ikonou Pokud není vysloveně
uvedeno, všechny vzorové operace předpokládají, že je kalkulátor ve svém původním
standardním nastavení. Použijte proceduru pod „Inicializace kalkulátoru“ k navrácení
kalkulátoru do jeho původního standardního nastavení.
Inicializace kalkulátoru
Následující proceduru proveďte, když chcete kalkulátor inicializovat a vrátit výpočtový
režim včetně konfigurace do jejich původního nastavení. Vezměte na vědomí, že tato
operace vymaže všechna data z paměti kalkulátoru.
Bezpečnostní upozornění
•Baterie držte z dosahu malých dětí.
•Používejte pouze baterie specifikované pro tento kalkulátor v tomto manuálu.