Casio FX-55 PLUS User manual

fx-55 PLUS
User’s Guide
CASIO Worldwide Education Website
http://edu.casio.com
CASIO EDUCATIONAL FORUM
http://edu.casio.com/forum/
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Contents
Important Information ..............................................................2
Sample Operations...................................................................2
Initializing the Calculator.........................................................2
Safety Precautions ...................................................................2
Handling Precautions...............................................................2
Removing the Hard Case.........................................................3
Turning Power On and Off.......................................................3
Adjusting Display Contrast .....................................................3
Key Markings ............................................................................3
Reading the Display .................................................................4
Configuring the Calculator Setup ...........................................4
Inputting Expressions and Values..........................................5
Toggling Calculation Results..................................................8
Basic Calculations....................................................................8
Remainder Calculations ........................................................11
Function Calculations............................................................12
Calculation Ranges, Number of Digits, and Precision........14
Errors.......................................................................................15
Before Assuming Malfunction of the Calculator... ..............16
Replacing the Battery.............................................................17
Specifications .........................................................................17
Frequently Asked Questions.................................................17
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Important Information
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.
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 this product and items that come with
it. Moreover, CASIO Computer Co., Ltd. shall not be liable for any claim of
any kind whatsoever by any other party arising out of the use of this product
and the items that come with it.
Be sure to keep all user documentation handy for future reference.
Sample Operations
Sample operations in this manual are indicated by a icon. Unless
specifically stated, all sample operations assume that the calculator is in its
initial default setup. Use the procedure under “Initializing the Calculator” to
return the calculator to its initial default setup.
For information about the Kand Lmarks that are shown in the
sample operations, see “Configuring the Calculator Setup”.
Initializing the Calculator
Perform the following procedure when you want to initialize the calculator
and return the setup to their initial default settings. Note that this operation
also clears all data currently in calculator memory.
r3(All)=(Yes)
Safety Precautions
Battery
Keep batteries out of the reach of small children.
Use only the type of battery specified for this calculator in this manual.
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Handling Precautions
Even if the calculator is operating normally, replace the battery at least
once every three years (LR44 (GPA76)).
A dead battery can leak, causing damage to and malfunction of the
calculator. Never leave a dead battery in the calculator. Do not try using
the calculator while the battery is completely dead.
The battery that comes with the calculator discharges slightly during
shipment and storage. Because of this, it may require replacement
sooner than the normal expected battery life.
Do not use an oxyride battery* or any other type of nickel-based
primary battery with this product. Incompatibility between such
batteries and product specifications can result in shorter battery life
and product malfunction.
Avoid use and storage of the calculator in areas subjected to
temperature extremes, and large amounts of humidity and dust.
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Do not subject the calculator to excessive impact, pressure, or
bending.
Never try to take the calculator apart.
Use a soft, dry cloth to clean the exterior of the calculator.
Whenever discarding the calculator or batteries, be sure to do so in
accordance with the laws and regulations in your particular area.
* Company and product names used in this manual may be registered
trademarks or trademarks of their respective owners.
Removing the Hard Case
Before using the calculator, slide its hard
case downwards to remove it, and then affix
the hard case to the back of the calculator as
shown in the illustration nearby.
Turning Power On and Off
Press Oto turn on the calculator.
Press 1A(OFF) to turn off the calculator.
Auto Power Off
Your calculator will turn off automatically if you do not perform any operation
for about 10 minutes. If this happens, press the Okey to turn the calculator
back on.
Adjusting Display Contrast
Display the CONTRAST screen by performing the following key operation:
s8(]CONT'). Next, use dand eto adjust contrast. After the
setting is the way you want, press A.
Important: If adjusting display contrast does not improve display readability,
it probably means that battery power is low. Replace the battery.
Key Markings
Pressing the 1key followed by a second key performs
the alternate function of the second key. The alternate
function is indicated by the text printed above the key. OFF
A
Alternate function
Keycap function
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Reading the Display
The display of the calculator shows expressions you input, calculation results,
and various indicators.
Input expression
Calculation result
Math Indicators
If a gindicator appears on the right side of the input expression, it means
the displayed calculation continues to the right. Use eand dto scroll
the input expression display.
Display indicators
This
indicator: Means this:
S
The keypad has been shifted by pressing the 1key. The
keypad will unshift and this indicator will disappear when
you press a key.
MThere is a value stored in independent memory.
FIX A fixed number of decimal places is in effect.
Math
Appears when natural calculation formula input (using
the same format as a formula is written) is enabled. Also
appears when LineO is selected as the display format.
$`
Calculation history memory data is available and can be
replayed, or there is more data above/below the current
screen.
Appears when “Manual” is selected for the “Simp” setting
on the setup menu, and indicates that the fraction result of
a calculation can be simplified.
Important: For some type of calculation that takes a long time to execute,
the display may show only the above indicators (without any value) while it
performs the calculation internally.
Configuring the Calculator Setup
Press sto display the setup menu. Press the number key for the item
you want to configure. To close the setup menu without changing any setting,
press Aor s.
Underlined ( ___ ) settings are initial defaults.
1MathO 2LineO Specifies the display format.
MathO displays input and calculation results using
the same format as they are written on paper.
LineO displays input the same way as MathO, but
calculation results are displayed in decimal
form.
Note: In this manual, the Ksymbol next to a sample operation indicates
MathO, while the Lsymbol indicates LineO.
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MathMath
MathMath

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3Fix 4Norm Specifies the number of digits for display of a calculation
result.
Fix: The value you specify (from 0 to 9) controls the number of decimal
places for displayed calculation results. Calculation results are rounded off
to the specified digit before being displayed.
Example: L100 ÷ 7 = 14.286 (Fix 3)
14.29 (Fix 2)
Norm: Selecting one of the two available settings (Norm 1, Norm 2)
determines the range in which results will be displayed in non-exponential
format. Outside the specified range, results are displayed using exponential
format.
Norm 1: 10–2 |x|, |x| 1010 Norm 2: 10–9 |x|, |x| 1010
Example: L1 ÷ 200 = 5 ×10–3 (Norm 1)
0.005 (Norm 2)
5ab/c 6d/c Specifies either mixed fraction (ab/c) or improper fraction
(d/c) for display of fractions in calculation results.
7Simp 1Auto ;2Manual Specifies automatic or manual simplification
of fractions. When manual is specified, fraction calculation results are always
displayed as improper fractions, even if the fraction display format setting is
ab/c.
Even if the result of a calculation can be displayed as a fraction when
automatic simplification is used, performing the same calculation with manual
simplification may produce a non-fraction (decimal) result.
Example: 2
3
2×51
8
sh(Simp)b(Auto)
k2 e2 c3 e*k5 e1 c8 =    41
3
sh(Simp)c(Manual)
k2 e2 c3 e*k5 e1 c8 =328
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8]CONT'Adjusts display contrast. See “Adjusting Display Contrast”
for details.
Initializing Calculator Settings
Perform the following procedure to initialize the calculator, which returns all
settings, including setup menu settings, to their initial defaults.
f1(Setup)=(Yes)
Inputting Expressions and Values
Basic Input Rules
Calculations can be input in the same form as they are written. When you
press =the priority sequence of the input calculation will be evaluated
automatically and the result will appear on the display.

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4 × (30 + 10 × 3) = 240
4 *( 30 +10 *3 )=
*
1* 2
*1A multiplication symbol (×) can be omitted when it occurs immediately
before an opening parenthesis, immediately before Rnd or RanInt# function
that includes parentheses, immediately before the Ran# (random number)
function, or immediately before independent memory (M) or π.
*2The closing parenthesis immediately before the =operation can be
omitted.
Input example omitting **1and )*2operations in the above
example.
4 (30 +10 *3 =
Note: • If the calculation becomes longer than the screen width during
input, the screen will scroll automatically to the right and the ]indicator will
appear on the display. When this happens, you can scroll back to the left
by using dand eto move the cursor. • Pressing ewhile the cursor
is at the end of the input calculation will cause it to jump to the beginning,
while pressing dwhile the cursor is at the beginning will cause it to jump
to the end. • You can input up to 99 bytes for a calculation. Each numeral,
symbol, or function normally uses one byte. Some functions require three
to 13 bytes. • The cursor will change shape to kwhen there are 10 bytes
or less of allowed input remaining. If this happens, end calculation input
and then press =.
Calculation Priority Sequence
The priority sequence of input calculations is evaluated in accordance with the
rules below. When the priority of two expressions is the same, the calculation
is performed from left to right.
1st Parenthetical expressions
2nd Function with parentheses: Rnd(, RanInt#(
3rd Functions that come after the input value (x2, x–1, °’ ”, %), powers
(x^), square root ())
4th Fractions
5th
Negative sign (–)
Note: When squaring a negative value (such as –2), the value
being squared must be enclosed in parentheses ((-2 )w
=). Since x2has a higher priority than the negative sign,
inputting -2 w=would result in the squaring of 2 and then
appending a negative sign to the result. Always keep the priority
sequence in mind, and enclose negative values in parentheses
when required.
6th Multiplication where the multiplication sign is omitted
7th Multiplication (×), division (÷), remainder calculations (÷R)
8th Addition, subtraction (+, –)
MathMath
MathMath

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Inputting a Calculation Formula
Your calculator lets you input calculator formulas using the same format as
they appear in your textbook (natural format). Fractions and special functions
(x2, x^, ), x−1, 10^) are also displayed in a natural format.
63
L!63 =
K!63 =
Important: • Certain types of expressions can cause the height of a
calculation formula to be greater than one display line. The maximum
allowable height of a calculation formula is two display screens (31 dots ×2).
Further input will become impossible if the height of the calculation you are
inputting exceeds the allowable limit. • Nesting of functions and parentheses
is allowed. Further input will become impossible if you nest too many functions
and/or parentheses. If this happens, divide the calculation into multiple parts
and calculate each part separately.
Note: When you press =and obtain a calculation result, part of the
expression you input may be cut off. If you need to view the entire input
expression again, press Aand then use dand eto scroll the input
expression.
Using Values and Expressions as Arguments
A value or an expression that you have already input can be used as the
argument of a function. After you have input 7
6, for example, you can make
it the argument of ', resulting in 7
6
'
.
To input 1 + 7
6and then change it to 1 + 7
6
'
1 +7 '6
dddd1Y(INS)
!
As shown above, the value or expression to the right of the cursor after
1Y(INS) are pressed becomes the argument of the function that is
specified next. The range encompassed as the argument is everything up
to the first open parenthesis to the right, if there is one, or everything up to
the first function to the right ('2, 102, etc.)
This capability can be used with the following functions: ', A, !, 6.
MathMath
MathMath
MathMath
MathMath
MathMath

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Correcting and Clearing an Expression
To delete a single character or function: Move the cursor so it is directly to
the right of the character or function you want to delete, and then press Y.
To insert a character or function into a calculation: Use dand eto
move the cursor to the location where you want to insert the character or
function and then input it.
To clear all of the calculation you are inputting: Press A.
Toggling Calculation Results
Each press of Fwill toggle the currently displayed calculation result between
its fraction form and decimal form, its 'form and decimal form, or its π
form and decimal form.
π÷ 6 = 1
6π= 0.5235987756
7/6 =0.5235987756 F1
6
π
('
2+ 2) ×' 3= '
6 + 2' 3= 5.913591358 K
(!2 e+2 )*!3 ='
'
6+2
'
3F5.913591358
Important: • Depending on the type of calculation result that is on the display
when you press the Fkey, the conversion process may take some time to
perform. • With certain calculation results, pressing the Fkey will not convert
the displayed value. • You cannot switch from decimal form to mixed fraction
form if the total number of digits used in the mixed fraction (including integer,
numerator, denominator, and separator symbols) is greater than 10.
Note: With MathO, pressing 1=instead of =after inputting a calculation
will display the calculation result in decimal form. Pressing Fafter that will
switch to the fraction form or πform of the calculation result. The 'form of
the result will not appear in this case.
Basic Calculations
Fraction Calculations
2 +1 =7
3 2 6 2 '3 e+1 '2 =7
6
or '2 c3 e+'1 c2 =7
6
1 =1
2 2
4 − 3 4 -k3 e1 c2 =
To switch a calculation result between improper fraction and mixed
fraction form: Press j.
Note: When manual fraction simplification is specified, this operation is
disabled and fractions are always displayed as improper fractions.
To switch a calculation result between fraction and decimal form:
Press F.
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2
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Percent Calculations
Inputting a value and pressing &causes the input value to become a
percent.
150 × 20% = 30 150 *20 &= 30
Calculate what percentage of 880 is 660. (75%)
660 /880 &= 75
Increase 2500 by 15%. (2875)
2500 +2500 *15 &= 2875
Discount 3500 by 25%. (2625)
3500 -3500 *25 &= 2625
Percent Conversion
Calculation results can be converted to a percent. While a calculation
result is displayed, press !&('%). Percent display can be up to 10
digits long. Pressing !&('%) again returns the calculation result to its
original display format.
1 + 2 = 3 = 300% 1 +2 =!&('%) 300%
!&('%) 3
1 ÷ 3 = 0.33 = 33.33% (Fix 2)
sd(Fix)c1 /3 =!&('%) 33.33%
4
5+ 2 3= 146.6666667%
4 '5 e+2 '3 =!&('%) 146.6666667%
'2 = 141.4213562% !2 =!&('%) 141.4213562%
1°2´3˝ = 103.4166667%
1 e2 e3 e=!&('%) 103.4166667%
When the number of display digits is specified by Fix, the value is converted
to a percent and then adjusted to the specified number of digits. The number
of display digits setting is not applied to the value stored in Ans memory.
When MathO is selected as the display format and the calculation result is
a fraction, root ('), or pi (π), the result is converted to a decimal fraction
and then to a percent. Pressing !&('%) again displays the decimal
fraction value.
When the calculation result is a sexagesimal value (degrees, minutes,
seconds), it is converted to a decimal value and then to a percent.
Percent conversion cannot be performed on the result of a remainder
calculation (÷R).
Degree, Minute, Second (Sexagesimal) Calculations
Performing an addition or subtraction operation between sexagesimal values,
or a multiplication or division operation between a sexagesimal value and a
decimal value will cause the result to be displayed as a sexagesimal value.
You also can convert between sexagesimal and decimal. The following
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