Casio FX-100W User manual

E S F G I
fx-100W
fx-115W
fx-570W
fx-991W
User’s Guide
Guía del usuario
Mode d’emploi
Bedienungsanleitung
Guida dell’utilizzatore

Removing and Replacing
the Calculator’s Cover
•To Remove the cover
Grasp the top of the cover, and slide the unit out from the
bottom.
•To Replace the cover
Grasp the top of the cover, and slide the unit in from the
bottom.
Always slide the unit into the cover with the unit’s display
end first. Never slide the keyboard end of the unit into the
cover.
ENGLISH

E-1
Safety Precautions
Be sure to read the following safety precautions before
using this calculator. Keep this manual handy for later ref-
erence.
Caution
This symbol is used to indicate information that can
result in personal injury or material damage if ignored.
Batteries
•After removing the batteries from the calculator, put
them in a safe place where there is no danger of
them getting into the hands of small children and
accidently swallowed.
•Keep batteries out of the reach of small children. If
accidently swallowed, consult with a physician im-
mediately.
•Never charge batteries, try to take batteries apart, or
allow batteries to become shorted. Never expose bat-
teries to direct heat or dispose of them by incinera-
tion.
•Misuse of batteries can cause them to leak acid that
can cause damage to nearby items and creates the
possibility of fire and personal injury.
•Always make sure that a battery’s positive kand
negative lsides are facing correctly when you
load it into the calculator.
•Remove the batteries if you do not plan to use the
calculator for a long time.
•Use only the type of batteries specified for this cal-
culator 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 danger of fire and personal injury.

E-2
•The displays and illustrations (such as key markings)
shown in this User’s Guide are for illustrative pur-
poses only, and may differ somewhat from the ac-
tual items they represent.
•The contents of this manual are subject to change
without notice.
•In no event shall CASIO Computer Co., Ltd. be li-
able to anyone for special, collateral, incidental, or
consequential damages in connection with or aris-
ing 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 P button on the back of the cal-
culator (step 6on page 35 or 36) before using it for
the first time ( fx-570W/ fx-100W ).
•Be sure to press the 5key before using the calcula-
tor for the first time (
fx-991W/ fx-115W ).
•Even if the calculator is operating normally, replace
the battery at least once every three years for the
fx-570W/
fx-991W/ fx-115W, or at least once every
two years for the fx-100W.
Dead battery can leak, causing damage to and malfunc-
tion of the calculator. Never leave the dead battery in the
calculator.
•The battery that comes with the calculator when you
purchase it is for testing only. It may not provide
full service life.
•Low battery power can cause memory contents to
become corrupted or lost completely. Always keep
written records of all important data.

E-3
•Avoid use and storage in areas subjected to tempera-
ture 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-
come 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 k e care never to leave the calculator where it might
be splashed by water or exposed to large amounts of
humidity or dust. Such elements can damage internal
circuitry.
•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 trou-
sers or other tight-fitting clothing where it might be sub-
jected to twisting or bending.
•Never try to take the calculator apart.
•Never press the keys of the calculator with a ball-point
pen or other pointed object.
•Use a soft, dry cloth to clean the exterior of the unit.
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 mois-
ture before wiping the calculator. Never use thinner, ben-
zine or other volatile agents to clean the calculator. Do-
ing so can remove printed markings and damage the
case.

E-4
Contents
Safety Precautions .......................................... 1
Handling Precautions ....................................... 2
Two-line Display ............................................... 5
Key Layout ........................................................ 6
Before Starting Calculations... ....................... 8
kModes .................................................................... 8
kInput Capacity ........................................................ 9
kMaking Corrections During Input ........................... 9
kReplay Function ..................................................... 9
kError Locator ........................................................ 10
kExponential Display Formats ............................... 10
kAnswer Memory ................................................... 10
Basic Calculations ......................................... 11
Memory Calculations ..................................... 11
kIndependent Memory ........................................... 11
kVariables .............................................................. 11
Fraction Calculations ..................................... 12
kFraction Calculations ........................................... 12
kDecimal-to-Fraction Conversion ........................... 12
kFraction-to-Decimal Conversion .......................... 12
Percentage Calculations ................................ 13
Scientific Function Calculations ................... 14
kTr igonometric/Inverse Trigonometric Functions .... 14
kHyperbolic/Inverse Hyperbolic Functions ............ 14
kAngle Unit Conversion ......................................... 15
kCommon and Natural Logarithms/
Antilogarithms ...................................................... 15
kSquare Roots, Cube Roots, Roots, Squares,
Cubes, Reciprocals, Factorials,
Random Numbers and π.......................................... 15
kFIX, SCI, RND ..................................................... 16
kENG Calculations ................................................ 17
kInputting ENG Calculation Symbols ..................... 17
kCoordinate Conversion
(Pol(x,y), Rec (r, θ )) ............ 18
kPermutation .......................................................... 19
kCombination ......................................................... 19

E-5
Statistical Calculations .................................. 19
kStandard Deviation (SD Mode) ............................ 19
kProbability Distribution Calculations ................... 20
kRegression Calculations (REG Mode) ................. 21
Complex Number Calculations
(CMPLX Mode) ............................................... 23
kAbsolute Value/Argument Calculation .................. 24
Formula Memory ............................................ 24
Metric Conversions (fx-570W/ fx-991W )....... 25
Scientific Constants (fx-570W/ fx-991W )...... 26
Base-nCalculations ...................................... 28
Integration Calculations ................................. 30
Degrees, Minutes, Seconds Calculations .... 30
Technical Information..................................... 31
kWhen you have a problem...... ............................. 31
kError Messages ................................................... 31
kOrder of Operations ............................................. 32
kStacks .................................................................. 33
kPower Supply ....................................................... 34
kInput Ranges ....................................................... 37
Specifications ................................................ 39
Two-line Display
You can simultaneously check the calculation
formula and its answer.
The first line displays the calculation formula.
The second line displays the answer.

E-6
DT CL
M-
M
AM
µ
G
mk
pf nPol( Rec(
nPr nCr
BINS
ScI
McI
AB
Csin
-1
cos
-1
tan
-1
D
XY
EF
DISTR Re <-> lm argrAbs
y
y
Rnd Ran#
10
e
SHIFT ALPHA MODE OFF
REPLAY
LOGIC
DEC OCTHEX
CONV
BIN
CONV
Key Layout
Page
Page
Page
Page
Page
Page
Page
Page
Page
Page
Page
Page
Page
Page
Page
12
9
25 25 15 16
25 30 2716 16 15
12
16 29
29 15 29 15 29
17 12 1615 15 15
11 30 11 1111 14 11 14 11
11 30 1414 14
20 24 24 1121 24 20 11 11 11
11 11 1111 11 2020
21 17 21 1721 17 9 11 19
9
21 17 21 1721 17 19 19
19 17 19 1719 17 21 18 21 18
16 1616 15 13
11 10
18 24
x!
T C
DRG
< fx-570W >
fx-100W:
15
Key Layout

E-7
DT CL
M-
M
AM
µ
G
mk
pf nPol( Rec(
nPr nCr
BINS
ScI
McI
AB
Csin
-1
cos
-1
tan
-1
D
XY
EF
DISTR Re <-> lm argrAbs
y
y
Rnd Ran#
10
e
SHIFT ALPHA MODE ON
REPLAY
LOGIC
DEC OCTHEX
CONV
BIN
CONV
Key Layout
Page
Page
Page
Page
Page
Page
Page
Page
Page
Page
Page
Page
Page
Page
Page
12
9
2
25 25 15 16
25 30 2716 16 15
12
16 29
29 15 29 15 29
17 12 1615 15 15
11 30 11 1111 14 11 14 11
11 30 1414 14
20 24 24 1121 24 20 11 11 11
11 11 1111 11 2020
21 17 21 1721 17 9 11 19
9
21 17 21 1721 17 19 19
19 17 19 1719 17 21 18 21 18
16 1616 15 13
11
15
10
18 24
x!
T C
DRG
fx-115W:
< fx-991W >

E-8
Before Starting Calculations...
kModes
Application Mode Mode
Name Indicator
Calculation Modes
Normal calculations COMP –
Complex number CMPLX CMPLX
calculations
Standard deviation SD SD
calculations
Regression calculations REG REG
Base-ncalculations BASE-N b (binary)
o(octal)
d(decimal)
H(hexadecimal)
Angle Unit Modes
Degrees DEG R
Radians RAD T
Grads GRA B
Display Modes
Exponential notation NORM1 –
(Canceling FIX and SCI NORM2 –
specification)
Number of decimal FIX Fix
place specification
Number of significant SCI Sci
digit specification
Exponential display range ENG ENG
specifications
Note!
•Mode indicators appear in the lower part of the display,
except for the Base-nindicators which appear in the ex-
ponent part of the display.
•The ENG mode cannot be selected while the calculator
is in the CMPLX or BASE-N mode.

E-9
•You cannot set the angle unit or the display mode while
the calculator is in the BASE-N mode.
•The COMP, CMPLX, SD, and REG modes can be used
in combination with the angle unit modes.
•Be sure to check the current calculation mode (SD, REG,
COMP, CMPLX) and angle unit mode (DEG, RAD, GRA)
before beginning a calculation.
kInput Capacity
•The memory area used for calculation input can hold 79
“steps.” Whenever you input the 73rd step of any calcu-
lation, the cursor changes from “_” to “k” to let you know
memory is running low. If you still need to input more,
you should divide your calculation into two or more parts.
kMaking Corrections During Input
•Use eand rto move the cursor to the location you
want.
•Press [to delete the number or function at the current
cursor position.
•Press AKto change to an insert cursor t. Inputting
something while the insert cursor is on the display in-
serts the input at the insert cursor position.
•Press e, r, AK, or =returns to the normal cur-
sor from the insert cursor.
kReplay Function
•Pressing ror erecalls the last calculation you per-
formed. You can then make any changes you want in
the calculation and re-execute it.
•Pressing tdoes not clear Replay memory, so you can
recall the last calculation even after you press t.
•Replay memory is cleared whenever you start a new
calculation, change to another mode, or turn off power.

E-10
kError Locator
•Pressing ror eafter an error occurs displays the
calculation with the cursor positioned at the location
where the error occurred.
kExponential 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. Press FFFF31
(or 2)to select
NORM 1 or NORM 2.
•NORM 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.
•NORM 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 re-
sults using the NORM 1 format.
kAnswer Memory
•Whenever you press =after inputting values or an ex-
pression, the calculated result is automatically stored in
Answer Memory. You can recall Answer Memory con-
tents by pressing g.
•Answer Memory can store up to 12 digits for the mantissa
and two digits for the exponent.
•Answer Memory contents are not changed if the opera-
tion performed by any of the above key operations re-
sults in an error.

E-11
47.00
90.00
–11.00
32.00
80.00
Basic Calculations
•Use the COMP mode for basic calculations.
•Example 1 : 3(510–9)
3 -R5 eD9 T=
•Example 2 : 5(97)
5 -R9 +7 T=
•You can skip all Toperations before =.
Memory Calculations
kIndependent Memory
•Values can be input directly into memory, added to
memory, or subtracted from memory. Independent
memory is convenient for calculating cumulative totals.
•Independent memory uses the same memory area as
variable M.
•To clear independent memory (M), input 0j3.
•Example:
23 9 32 23 +9 j3
53 6 47 53 ,6 |
)45 2 90
45 -2 A{(Total) –11
03
kVariables
•There are nine variables (A through F, M, X and Y), which
can be used to store data, constants, results, and other
values.
•Use the following operation to delete data assigned to
all nine variables: AC=.
•Use the following operation to delete data assigned to a
particular variable: 0j1. This operation deletes
the data assigned to variable A.
1.5-08

E-12
8.400
6.900
4
5
2
3
27 15.00
•Example: 193.2 23 8.4
193.2 28 6.9
193.2 j1\23 =
p1\28 =
Fraction Calculations
kFraction Calculations
•Use the COMP mode for fraction calculations.
•Values are automatically displayed in decimal format
whenever the total number of digits of a fractional value
(integer numerator denominator separator marks)
exceeds 10.
•Example 1 :  1
2 C3 +1 C4 C5 =
•Example 2 : 1.6
1 C2 +1.6 =
•Fraction/decimal calculation results are always decimal.
kDecimal-to-Fraction Conversion
•Example: 2.75 →2 2.75 =2.75
C
AB
kFraction-to-Decimal Conversion
•Example: ↔0.5 (Fraction ↔Decimal)
1 C2 =
2.100
1
2
3
4
23 4.00
11 4.00
1 2.00
1
2

E-13
C
C
Percentage Calculations
•Use the COMP mode for percentage calculations.
•Example 1 : To calculate 12% of 1500
1500 -12 Av
•Example 2 : To calculate what percentage of 880 is 660
660 \880 Av
•Example 3 : To add 15% onto 2500
2500 -15 Av+
•Example 4 : To discount 3500 by 25%
3500 -25 Av,
•Example 5: If 300 grams are added to a test sample
originally weighing 500 grams, what is the percentage
increase in weight?
100 160 (%)
300 +500 Av
•Example 6: If temperature changes from 40°C to 46°C,
what percentage did it rise?
100 15 (%)
46 ,40 Av
0.500
1 2.00
180.00
75.00
2625.00
160.00
2875.00
300 500
500
15.00
46 40
40

E-14
Scientific Function Calculations
•Use the COMP mode for scientific function calculations.
• = 3.14159265359
kTrigonometric/Inverse Trigonometric
Functions
•Example 1 : sin63°5241
qqq1→“ R”
S63 I52 I41 I=
•Example 2 : cos (rad)
qqq2→“ T”
WRAx\3 T=
•Example 3 : cos1rad
qqq2→“ T”
WAVRL2 \2 T=
g\Ax=
•Example 4 : tan10.741
qqq1→“ R”
Ag0.741 =
kHyperbolic/Inverse Hyperbolic
Functions
•Example 1 : sinh 3.6
MS3.6 =
•Example 2 : sinh130
MAj30 =
0.89785901200
0.500
R
T
0.78539816300
0.2500
36.5384457700
T
R
π
3
2
2
π
4
4.09462222400
18.2854553600

E-15
5.28719690900
–1.29002405300
kAngle Unit Conversion
•Press Avto display the following menu.
•Pressing 1, 2, or 3converts the displayed value to
the corresponding angle unit.
•Example : To convert 4.25 radians to degrees
4.25 Av2(R) =243.5070629
4 . 2 5
r
kCommon and Natural Logarithms/
Antilogarithms
•Example 1 : log 1.23 R1.23 =
•Example 2 : In 90 (loge90)
T90 =
•Example 3 : e10 AU10 =
•Example 4 : 101.5 AQ1.5 =
•Example 5 : 242 w4 =
kSquare Roots, Cube Roots, Roots,
Squares, Cubes, Reciprocals,
Factorials, Random Numbers and π
•Example 1: 235
L2 +L3 -L5 =
•Example 2: 35 327
AD5 +ADD27 =
(fx-100W/ fx-115W: D)
1 2 3
D R G
FFF1→“ R”
0.08990511100
4.4998096700
22026.4657900
31.622776600
16.00

E-16
1023.00
1.98864779500
12.00
40320.00
0.66400
1728.00
9.42477796100
400.00
28.57100
400.00000
28.57100
28.57100
1 1
3 4
1
(Specifies three
decimal places.)
(Calculation continues using 10
display digits)
1
7
•Example 3: 7123 ( = 123 )
7 AH123 =
•Example 4: 123302
123 +30 K=
•Example 5: 12312 N=
•Example 6:
R3a,4aTa=
•Example 7: 8! 8 Af=
•Example 8: To generate a random number between
0.000 and 0.999
AM=
Example (results differ each time)
•Example 9: 3π3 Ax=
kFIX, SCI, RND
•Example 1: 200714400
200 \7 -14 =
FFFF13
200 \7 =
-14 =
Performing the same calculation using the specified
number of decimal places
200 \7 =
(Internal rounding) AQ
400.00000
Fix

E-17
399.99400
3.3–01
56.088003
81.25–03
Sci
-14 =
•Press FFFF31to clear FIX specification.
•Example 2: 13, displaying result with two significant
digits (SCI 2)
FFFF221 \3 =
•Press FFFF31to clear SCI specification.
kENG Calculations
•Example 1: To convert 56,088 meters to kilometers
56088 =J
•Example 2: To convert 0.08125 grams to milligrams
0.08125 =J
kInputting ENG Calculation Symbols
•FFFFF1enters the ENG mode in which
ENG symbols can be used in calculations.
•To exit the ENG mode, press FFFFF2.
•The following are the nine ENG symbols that can be
used in ENG mode calculations.
Key Operation Unit Symbol
Ak103k (kilo)
AM106M (Mega)
Ag109G (Giga)
At1012 T (Tera)
Am10–3 m (milli)
AN10–6 µ(micro)
An10–9 n (nano)
Ap10–12 p (pico)
Af10–15 f (femto)

E-18
2.00
1.00
1.73205080800
T
R
*For displayed values, the calculator selects the ENG sym-
bol that makes the numeric part of the value fall within
the range of 1 to 1000.
*ENG symbols cannot be used when inputting fractions.
*The ENG mode cannot be used in combination with the
CMPLX, or BASE-N modes.
•Performing any of the key operations in the above table
while you are not in the ENG mode inputs the exponen-
tial value in the “Unit” column (without inputting the ENG
symbol).
•Example: 910 = 0.9 m (milli)
FFFFF10.
ENG
9 \10 =900.
9 1 m
In the ENG mode, even standard (non-ENG)
calculation results are displayed using ENG symbols.
AP0.9
J900.
9 1 m
k Coordinate Conversion (Pol(x,y), Rec (r, θ ))
•Calculation results are automatically assigned to vari-
ables E and F.
•Example 1: To convert polar coordinates (r2,
 60°)
to rectangular coordinates (x, y) (DEG mode)
xAF2 P60 T=
y0o
•0n, 0oswaps displayed value with value in
memory.
•Example 2: To convert rectangular coordinates (1, 3)
to polar coordinates (r,
 ) (RAD mode)
rAf1 PL3 T=