Casio FX-85MS User Manual

fx-82MS
fx-83MS
fx-85MS
fx-270MS
fx-300MS
fx-350MS

User's Guide

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http://world.casio.com/edu/

CASIO ELECTRONICS CO., LTD.
Unit 6, 1000 North Circular Road,
London NW2 7JD, U.K.

Removing and Replacing
the Calculator’s Cover

• Before starting .....1

Holding the cover as shown in the illustration, slide the
unit out of the cover.

•After you are finished .....2

Holding the cover as shown in the illustration, slide the
unit out of the cover.

•Always slide the keyboard end of the unit into the cover
first. Never slide the display end of the unit into the cover.

.....1

.....2

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Safety Precautions

Be sure to read the following safety precautions before
using this calculator. Keep this manual handy for later ref­erence.

Caution

This symbol is used to indicate information that can
result in personal injury or material damage if ignored.

Batteries

•After removing the battery from the calculator, put it

in a safe place where it will not get into the hands of
small children and accidentally swallowed.

• Keep batteries out of the reach of small children. If

accidentally swallowed, consult with a physician im­mediately.

• Never charge batteries, try to take batteries apart, or

allow batteries to become shorted. Never expose
batteries to direct heat or dispose of them by incin­eration.

•Misuse of batteries can cause them to leak and dam-

age nearby items, and can create the risk of fire and
personal injury.

•Always make sure that the battery’s positive
negative

l ends are facing correctly when you load

it into the calculator.

• Remove the battery if you do not plan to use the
calculator for a long time (fx-82MS/fx-83MS/fx­270MS/fx-350MS).

•Use only the type of battery specified for this calcu­lator in this manual.

Disposing of the Calculator

• Never dispose of the calculator by burning it. Doing
so can cause certain components to suddenly burst,
creating the risk of fire and personal injury.

• The displays and illustrations (such as key markings)
shown in this User’s Guide are for illustrative purposes
only, and may differ somewhat from the actual items they
represent.

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k and

• The contents of this manual are subject to change with­out notice.

•In no event shall CASIO Computer Co., Ltd. be liable to
anyone for special, collateral, incidental, or consequential
damages in connection with or arising out of the purchase
or use of these materials. Moreover, CASIO Computer
Co., Ltd. shall not be liable for any claim of any kind
whatsoever against the use of these materials by any
other party.

Handling Precautions

• Be sure to press the 5 key before using the calcu­lator for the first time.

• Even if the calculator is operating normally, replace
the battery at least once every three years for the fx­83MS/fx-85MS/fx-270MS/fx-300MS/fx-350MS, or at
least once every two years for the fx-82MS.

A dead battery can leak, causing damage to and mal­function of the calculator. Never leave a dead battery in
the calculator.

• The battery that comes with this unit discharges
slightly during shipment and storage. Because of
this, it may require replacement sooner than the
normal expected battery life.

• Low battery power can cause memory contents to
become corrupted or lost completely. Always keep
written records of all important data.

•Avoid use and storage in areas subjected to tem­perature extremes.

Very low temperatures can cause slow display response,
total failure of the display, and shortening of battery life.
Also avoid leaving the calculator in direct sunlight, near
a window, near a heater or anywhere else it might be
exposed to very high temperatures. Heat can cause dis­coloration or deformation of the calculator’s case, and
damage to internal circuitry.

•Avoid use and storage in areas subjected to large
amounts of humidity and dust.

Ta ke care never to leave the calculator where it might
be splashed by water or exposed to large amounts of
humidity or dust. Such conditions can damage internal
circuitry.

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• Never drop the calculator or otherwise subject it to
strong impact.

• Never twist or bend the calculator.

Avoid carrying the calculator in the pocket of your trou­sers or other tight-fitting clothing where it might be sub­jected to twisting or bending.

• Never try to take the calculator apart.

• Never press the keys of the calculator with a ball­point pen or other pointed object.

• Use a soft, dry cloth to clean the exterior of the cal­culator.

If the calculator becomes very dirty, wipe it off with a
cloth moistened in a weak solution of water and a mild
neutral household detergent. Wring out all excess mois­ture before wiping the calculator. Never use thinner, ben­zene or other volatile agents to clean the calculator. Do­ing so can remove printed markings and can damage
the case.

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Contents

Removing and Replacing the

Calculator’s Cover .................................. 1

Safety Precautions .................................. 2

Handling Precautions ............................. 3

Two-line Display ...................................... 7

Before getting started... .......................... 7

kModes .................................................................... 7

kInput Capacity ........................................................ 8

kMaking Corrections During Input ........................... 8

kReplay Function ..................................................... 9

kError Locator .......................................................... 9

kMulti-statements .................................................... 9

kExponential Display Formats ............................... 10

kDecimal Point and Separator Symbols ................ 10

kInitializing the Calculator ....................................... 11

Basic Calculations ................................. 11

kArithmetic Calculations .........................................11

kFraction Operations ..............................................11

kPercentage Calculations ...................................... 13

kDegrees, Minutes, Seconds Calculations ............ 14

kFIX, SCI, RND ..................................................... 15

Memory Calculations ............................ 16

kAnswer Memory ................................................... 16

kConsecutive Calculations .................................... 16

kIndependent Memory ........................................... 16

kVa riables .............................................................. 17

Scientific Function Calculations.......... 17

kTrigonometric/Inverse Trigonometric Functions ... 18

kHyperbolic/Inverse Hyperbolic Functions ............ 18

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kCommon and Natural Logarithms/

Antilogarithms ...................................................... 19

kSquare Roots, Cube Roots, Roots, Squares,

Cubes, Reciprocals, Factorials, Random Numbers,

π

, and Permutation/Combination ......................... 19

kAngle Unit Conversion ......................................... 20

kCoordinate Conversion (Pol (

kEngineering Notation Calculations ....................... 21

x, y), Rec (r,



)) ..... 20

Statistical Calculations ......................... 21

Standard Deviation .................................................. 21

Regression Calculations .......................................... 24

Technical Information ........................... 28

kWhen you have a problem...... ............................. 28

kError Messages ................................................... 28

kOrder of Operations ............................................. 30

kStacks .................................................................. 31

kInput Ranges ....................................................... 32

Power Supply ........................................ 34

Specifications ........................................ 37

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Two-line Display

The two-line display makes it possible to view
both the calculation formula and its result at
the same time.

• The upper line shows the calculation formula.

• The lower line shows the result.

A separator symbol is displayed every three digits when
the integer part of the mantissa has more than three dig­its.

Before getting started...

k Modes

Before starting a calculation, you must first enter the cor­rect mode as indicated in the table below.

To perform this type of Perform this To enter

calculation: key operation: this mode:

Basic arithmetic calculations F 1 COMP

Standard deviation F 2 SD

Regression calculations

•Pressing the
setup screens. Setup screens are described in the sec­tions of this manual where they are actually used to
change the calculator setup.

•In this manual, the name of the mode you need to enter
in order to perform the calculations being described is
indicated in the main title of each section.

Example:

F key more than once displays additional

Statistical
Calculations

F 3 REG

SD

REG

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Note!

•To return the calculation mode and setup to the initial
defaults shown below, press

Calculation Mode: COMP
Angle Unit: Deg
Exponential Display Format: Norm 1
Fraction Display Format: a
Decimal Point Character: Dot

• Mode indicators appear in the upper part of the display.

•Be sure to check the current calculation mode (SD, REG,
COMP) and angle unit setting (Deg, Rad, Gra) before
beginning a calculation.

A B 2(Mode) =.

b

/c

k Input Capacity

• The memory area used for calculation input can hold 79
“steps.” One step is taken up each time you press a
number key or arithmetic operator key ( +, ,, -, \ ).

A or p key operation does not take up a step, so

A
inputting

•You can input up to 79 steps for a single calculation.

•Pressing the

A D, for example, takes up only one step.

Whenever you input the 73rd step of any calculation,
the cursor changes from “_” to “k” to let you know
memory is running low. If you need to input more than
79 steps, you should divide your calculation into two or
more parts.

you can use in a subsequent calculation. See “Answer
Memory” for more information about using the g key.

g key recalls the last result obtained, which

k Making Corrections During Input

•Use e and r to move the cursor to the location you
want.

•Press [ to delete the number or function at the current
cursor position.

•Press A K to change to an insert cursor t. Inputting
something while the insert cursor is on the display in­serts the input at the insert cursor position.

• Pressing

A K, or = returns to the normal cursor from

the insert cursor.

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k Replay Function

• Every time you perform a calculation, the replay function
stores the calculation formula and its result in replay
memory. Pressing the
result of the calculation you last performed. Pressing
again back steps sequentially (new-to-old) through past
calculations.

•Pressing the e or r key while a replay memory cal­culation is on the display changes to the editing screen.

•Pressing the
a calculation displays the editing screen for that calcula­tion.

•Pressing

•Replay memory capacity is 128 bytes for storage of both

• Replay memory is cleared by any of the following ac-

t does not clear replay memory, so you can

recall the last calculation even after you press

expressions and results.

tions.
When you press the
When you initialize modes and settings by pressing

[ key displays the formula and

[

e or r key immediately after you finish

t.

5 key

A

B 2(or 3) =

When you change from one calculation mode to another
When you turn off the calculator.

k Error Locator

•Pressing r or e after an error occurs displays the
calculation with the cursor positioned at the location
where the error occurred.

k Multi-statements

A multi-statement is an expression that is made up of two
or more smaller expressions, which are joined using a colon
( : ).

• Example: To add 2 + 3 and then multiply the result by 4

=

2+3

Ans×4

20.

5.

Disp

+ 3 p \ g - 4 =

2

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k Exponential Display Formats

This calculator can display up to 10 digits. Larger values
are automatically displayed using exponential notation. In
the case of decimal values, you can select between two
formats that determine at what point exponential notation
is used.

•To change the exponential display format, press the
key a number of times until you reach the exponential
display format setup screen shown below.

Fix Sci Nor

1

2

3. On the format selection screen that appears,

•Press
press 1 to select Norm 1 or 2 for Norm 2.

m

3

F

uNorm 1

With Norm 1, exponential notation is automatically used
for integer values with more than 10 digits and decimal
values with more than two decimal places.

uNorm 2

With Norm 2, exponential notation is automatically used
for integer values with more than 10 digits and decimal
values with more than nine decimal places.

•All of the examples in this manual show calculation re­sults using the Norm 1 format.

k Decimal Point and Separator Symbols

You can use the display setup (Disp) screen to specify the
symbols you want for the decimal point and 3-digit sepa­rator.

•To change the decimal point and separator symbol set­ting, press the
the setup screen shown below.

F key a number of times until you reach

Disp

1

•Display the selection screen.

1 r

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