Casio fx-115ESPlus User Manual

fx-115ES PLUS fx-991ES PLUS C

User’s Guide

CASIO Worldwide Education Website

http://edu.casio.com

CASIO EDUCATIONAL FORUM

http://edu.casio.com/forum/

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

Using Menus ............................................................................ 5

Specifying the Calculation Mode .......................................... 5

Configuring the Calculator Setup .......................................... 5

Inputting Expressions and Values ......................................... 7

Recurring Decimal Calculations ......................................... 10

Toggling Calculation Results ............................................... 14

Basic Calculations ................................................................. 14

Remainder Calculations ....................................................... 18

Prime Factorization ............................................................... 19

Function Calculations ........................................................... 20

Complex Number Calculations (CMPLX) ........................... 25

Using CALC ............................................................................ 26

Using SOLVE .......................................................................... 27

Statistical Calculations (STAT) ............................................. 29

Base-

Equation Calculations (EQN) ............................................... 35

Matrix Calculations (MATRIX) ............................................... 37

Creating a Number Table from Two Functions (TABLE) .... 39

Vector Calculations (VECTOR) ............................................. 41

Inequality Calculations (INEQ) ............................................ 43

Using VERIFY (VERIF) .......................................................... 45

n Calculations (BASE-N) ............................................. 33

Distribution Calculations (DIST) .......................................... 47

Scientific Constants .............................................................. 50

Metric Conversion ................................................................. 51

Calculation Ranges, Number of Digits, and Precision ....... 52

Errors ...................................................................................... 54

Before Assuming Malfunction of the Calculator... ............. 56

Replacing the Battery ............................................................ 56

Specifications ........................................................................ 57

Frequently Asked Questions ................................................ 57

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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 B, b, v, and V marks 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 calculation mode and setup to their initial default settings. Note that this operation also clears all data currently in calculator memory.

!9(CLR)3(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.

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.

• Do not subject the calculator to excessive impact, pressure, or bending.

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• 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 O to 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 O key to turn the calculator back on.

Adjusting Display Contrast

Display the CONTRAST screen by performing the following key operation: 1N(SETUP)c8(]CONT' ). Next, use d and e to 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

Alternate function

Pressing the 1 or S key 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. The following shows what the different colors of the alternate function key text mean.

Alternate function

–1

sin

Keycap function

If key marking text is this color:

Yellow

Red

Purple (or enclosed in purple brackets)

Green (or enclosed in green brackets)

It means this:

Press 1 and then the key to access the applicable function.

Press S and then the key to input the applicable variable, constant, or symbol.

Enter the CMPLX Mode to access the function.

Enter the BASE-N Mode to access the function.

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Reading the Display

The display of the calculator shows expressions you input, calculation results, and various indicators.

Input expression Indicators

Math

Calculation result

• If a ' indicator appears on the right side of the calculation result, it means the displayed calculation result continues to the right. Use e and d to scroll the calculation result display.

• If a g indicator appears on the right side of the input expression, it means the displayed calculation continues to the right. Use e and d to scroll the input expression display. Note that if you want to scroll the input expression while both the ' and g indicators are displayed, you will need to press A first and then use e and d to scroll.

Display indicators

Math

This indicator:

STO

RCL

STAT

CMPLX

MAT

Means this:

The keypad has been shifted by pressing the 1 key. The keypad will unshift and this indicator will disappear when you press a key.

The alpha input mode has been entered by pressing the S key. The alpha input mode will be exited and this indicator will disappear when you press a key.

There is a value stored in independent memory.

The calculator is standing by for input of a variable name to assign a value to the variable. This indicator appears after you press 1t(STO).

The calculator is standing by for input of a variable name to recall the variable’s value. This indicator appears after you press t.

The calculator is in the STAT Mode.

The calculator is in the CMPLX Mode.

The calculator is in the MATRIX Mode.

VCT

FIX

SCI

Math

The calculator is in the VECTOR Mode.

The default angle unit is degrees.

The default angle unit is radians.

The default angle unit is grads.

A fixed number of decimal places is in effect.

A fixed number of significant digits is in effect.

Natural Display 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.

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Disp

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.

The display currently shows an intermediate result of a multi-statement calculation.

Using Menus

Some of the calculator’s operations are performed using menus. Pressing N or w, for example, will display a menu of applicable functions. The following are the operations you should use to navigate between menus.

• You can select a menu item by pressing the number key that corresponds to the number to its left on the menu screen.

• The $ indicator in the upper right corner of a menu means there is another menu below the current one. The ` indicator means another menu above. Use c and f to switch between menus.

• To close a menu without selecting anything, press A.

Specifying the Calculation Mode

When you want to perform this type of operation:

General calculations

Complex number calculations

Statistical and regression calculations

Calculations involving specific number systems (binary, octal, decimal, hexadecimal)

Equation solution

Matrix calculations

Generate a number table based on one or two functions

Vector calculations

Inequality solution

Verify a calculation

Distribution Calculations

Perform this key operation:

N1(COMP) N2(CMPLX) N3(STAT)

N4(BASE-N)

N5(EQN) N6(MATRIX)

N7(TABLE)

N8(VECTOR) Nc1(INEQ) Nc2(VERIF) Nc3(DIST)

Note: The initial default calculation mode is the COMP Mode.

Configuring the Calculator Setup

First perform the following key operation to display the setup menu: 1N(SETUP). Next, use c and f and the number keys to configure the settings you want. Underlined ( ___ ) settings are initial defaults.

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1MthIO 2LineIO Specifies the display format. Natural Display (MthIO) causes fractions,

MathMath

irrational numbers, and other expressions to be displayed as they are written on paper.

MthIO: Selects MathO or LineO. 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 linear format.

Linear Display (LineIO) causes fractions and other expressions to be displayed in a single line.

Note: • The calculator switches to Linear Display automatically whenever you enter the STAT, BASE-N, MATRIX, or VECTOR Mode. • In this manual, the B symbol next to a sample operation indicates Natural Display (MathO), while the b symbol indicates Linear Display.

3Deg 4Rad 5Gra Specifies degrees, radians or grads as the angle unit for value input and calculation result display.

Note: In this manual, the v symbol next to a sample operation indicates degrees, while the V symbol indicates radians.

6Fix 7Sci 8Norm 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: b 100 ÷ 7 = 14.286 (Fix 3)

14.29 (Fix 2)

Sci: The value you specify (from 1 to 10) controls the number of significant digits for displayed calculation results. Calculation results are rounded off to the specified digit before being displayed.

–1

Example: b 1 ÷ 7 = 1.4286 × 10

1.429 × 10

(Sci 5)

–1

(Sci 4)

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|  10

Example: b 1 ÷ 200 = 5 × 10–3 (Norm 1)

0.005 (Norm 2)

c1ab/c c2 d/c Specifies either mixed fraction (ab/c) or improper fraction (d/c) for display of fractions in calculation results.

c3CMPLX 1a+b

a+bi) or polar coordinates (r∠) for EQN Mode solutions.

(

i ; 2r∠ Specifies either rectangular coordinates

c4STAT 1ON ; 2OFF Specifies whether or not to display a FREQ (frequency) column in the STAT Mode Stat Editor.

c5TABLE 1f(x) ; 2f(x),g(x) Specifies whether to use function only or the two functions

f(x) and g(x) in the TABLE Mode.

f(x)

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c6Rdec 1ON ; 2OFF Specifies whether or not to display calculation results using recurring decimal form.

c7Disp 1Dot ; 2Comma Specifies whether to display a dot or a comma for the calculation result decimal point. A dot is always displayed during input.

Note: When dot is selected as the decimal point, the separator for multiple results is a comma (,). When comma is selected, the separator is a semicolon (;).

c8]CONT' Adjusts display contrast. See “Adjusting Display Contrast” for details.

Initializing Calculator Settings

Perform the following procedure to initialize the calculator, which returns the calculation mode to COMP and returns all other settings, including setup menu settings, to their initial defaults.

19(CLR)1(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.

4 × sin30 × (30 + 10 × 3) = 120 4 *s 30 )*( 30 + 10 * 3 )=

* *

*1 Input of the closing parenthesis is required for sin, sinh, and other functions

that include parentheses.

These multiplication symbols (×) can be omitted. A multiplication symbol

can be omitted when it occurs immediately before an opening parenthesis, immediately before sin or other function that includes parentheses, immediately before the Ran# (random number) function, or immediately before a variable (A, B, C, D, E, F, M, X, Y), scientific constants, π or

The closing parenthesis immediately before the = operation can be

omitted.

Input example omitting **

and )*3 operations in the above

example.

MathMath

4 s 30 )( 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 d and e to move the cursor. • When Linear Display is selected, pressing f will cause the cursor to jump to the beginning of the calculation, while c will jump to the end. • When Natural Display is selected, pressing

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e while the cursor is at the end of the input calculation will cause it to jump to the beginning, while pressing d while 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 k when 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

2nd

3rd

4th

Parenthetical expressions

Functions that require an argument to the right and a closing parenthesis “)” following the argument.

Functions that come after the input value ( %, '

t), powers (x^), roots (")

, x3, x–1, x!, °’ ”, °, r, g,

Fractions

Negative sign (–), base-

n symbols (d, h, b, o)

Note: When squaring a negative value (such as –2), the value being squared must be enclosed in parentheses ((- 2 )w

5th

=). Since inputting - 2 w= would result in the squaring of 2 and then

has a higher priority than the negative sign,

appending a negative sign to the result. Always keep the priority sequence in mind, and enclose negative values in parentheses when required.

6th

Metric conversion commands (cm'in, etc.), STAT Mode estimated values (m, n, m

, m2)

7th Multiplication where the multiplication sign is omitted

8th

Permutation (nPr), combination (nCr), complex number polar coordinate symbol (∠)

9th Dot product (·)

10th

Multiplication (×), division (÷), remainder calculations (÷R)

11th Addition, subtraction (+, –)

12th Logical AND (and)

13th Logical OR, XOR, XNOR (or, xor, xnor)

Inputting with Natural Display

Selecting Natural Display makes it possible to input and display fractions

and certain functions (log, Abs) just as they are written in your textbook.

2 + '2

1 + '2

' 2 +! 2 ee 1 +! 2 =

, x3, x^, ), #, ", x−1, 10^, e^, ∫ , d/dx, Σ, Π,

MathMath

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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 using Natural Display, part of the expression you input may be cut off. If you need to view the entire input expression again, press A and then use d and e to scroll the input expression.

Using Values and Expressions as Arguments

(Natural Display only)

A value or an expression that you have already input can be used as the

argument of a function. After you have input it the argument of ', resulting in

, for example, you can make

To input 1 +

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 (sin(30), log2(4), etc.) This capability can be used with the following functions: ', &, 7,

17(F), 1& (8), a&(9), 1 6("), 1l($), 1i(%), !, 6, 1!(#), 1w(Abs).

and then change it to 1 +

MathMath

Overwrite Input Mode (Linear Display only)

You can select either insert or overwrite as the input mode, but only while Linear Display is selected. In the overwrite mode, text you input replaces the text at the current cursor location. You can toggle between the insert and overwrite modes by performing the operations: 1Y(INS). The cursor appears as “

Note: Natural Display always uses the insert mode, so changing display format from Linear Display to Natural Display will automatically switch to the insert mode.

I” in the insert mode and as “ ” in the overwrite mode.

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. In the overwrite mode, move the cursor so it is directly under the character or function you want to delete, and then press Y.

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To insert a character or function into a calculation: Use d and e to move the cursor to the location where you want to insert the character or function and then input it. Be sure always to use the insert mode if Linear Display is selected. To clear all of the calculation you are inputting: Press A.

Recurring Decimal Calculations

Your calculator uses a recurring decimal when you input a value. Calculation results also can be displayed using recurring decimal form whenever applicable.

Inputting a Recurring Decimal

When inputting a recurrent decimal, press a!( k ) before inputting its period (repetend) and then input the period up to the ending value. To input

the recurring decimal 0.909090.... (0.90), perform the following operation:

“0 .a!( k ) 90”. Important: • If the value starts with an integer part (like: 12.3123123...), do

not include the integer part when inputting the period (12.312). • Recurring decimal input is possible only when Natural Display is selected.

To input 0.33333... (0.3) B

0 .

a!( k )

To input 1.428571428571... (1.428571) B

1 .a!( k )

MathMath

428571

To calculate 1.021 + 2.312 B

1 .a!( k ) 021e+ 2 .a!( k ) 312=

Calculation result displayed as recurring decimal value: f

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MathMath

Note: • You can specify up to 14 decimal places for the recurring decimal period. If you input more than 14 decimal places, the value will be treated as a terminating decimal and not a recurring decimal. • Recurring decimal value input can be performed regardless of the Rdec setting on the setup menu.

Displaying a Calculation Result as a Recurring Decimal Value

Calculation results that can be displayed as recurring decimal values will be displayed as such when ON is selected for the Rdec setting on the setup menu. Pressing the f key will cycle between the available calculation result formats as shown below.

Fraction Recurring Decimal

Decimal Value According to Display (Norm, Fix, Sci) Settings

Recurring Decimal Fraction

= 0.142857 = 0.1428571429 (Norm 1) B

1 ' 7 =

Display as recurring decimal: f

Decimal value according to Norm 1 setting: f

Return to initial display format (fraction): f

1 ÷ 7 =

= 0.142857 = 0.1428571429 (Norm 1) B

MathMath

1 / 7 !=

Display as fraction: f

Display as recurring decimal: f

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MathMath

Return to initial display format (Norm 1): f

MathMath

1 ' 7 =

Display as recurring decimal: f

Decimal value according to Norm 1 setting: f

Return to initial display format (fraction): f

1 ÷ 7 = 0.1428571429 (Norm 1) = 0.142857 =

= 0.142857 = 0.1428571429 (Norm 1) b

1 / 7 =

Display as fraction: f

Display as recurring decimal: f

Return to initial display format (Norm 1): f

Conditions for Displaying a Calculation Result as a Recurring Decimal

If a calculation result satisfies the following conditions, pressing f will display it as a recurring decimal value.

• The total number of digits used in the mixed fraction (including integer, numerator, denominator, and separator symbol) must be no more than

10.

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• The data size of value to be displayed as the recurring decimal must be no larger than 99 bytes. Each value and the decimal point require one byte, and each digit of the period requires one byte. The following, for example, would require of total of 8 bytes (4 bytes for the values, 1 byte for the decimal

point, 3 bytes for the period): 0.123

Note: For information about switching the display format of a calculation result when OFF is selected for the Rdec setting on the setup menu, see “Toggling Calculation Results”.

Recurring Decimal Examples

0.3 + 0.45 = 0.78 B

MathMath

0 .a!( k ) 3 e+ 0 .a!( k ) 45 =f

1.6 + 2.8 = 4.5 B

1 .a!( k ) 6 e+ 2 .a!( k ) 8 =f

123

To confirm the following: 0.123 =

0.12345 =

12345

, 0.1234 =

999

99999

123 ' 999 =

1234 ' 9999 =

1234

9999

MathMath

12345 ' 99999 =

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MathMath

Toggling Calculation Results

While Natural Display is selected, each press of f will 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 =

15(π)/ 6 =

= 0.5235987756 B

1 6

0.5235987756

(

(! 2 e+ 2 )*! 3 =

While Linear Display is selected, each press of f will toggle the currently displayed calculation result between its decimal form and fraction form.

1 ÷ 5 = 0.2 =

1 / 5 =

1 –

1 - 4 ' 5 =

Important: • Depending on the type of calculation result that is on the display when you press the f key, the conversion process may take some time to perform. • With certain calculation results, pressing the f key will not convert the displayed value. • When ON is selected for Rdec on the setup menu, pressing f will switch the calculation result to recurring decimal form. For details, see “Recurring Decimal Calculations”. • 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 Natural Display (MathO), pressing 1= instead of = after inputting a calculation will display the calculation result in decimal form. Pressing f after that will switch the calculation result to recurring decimal form, fraction form or π form. The ' form of the result will not appear in this case.

+ 2) ×

454

6 + 2'3

= 0.2 b

= 5.913591358 B

0.2

5.913591358

1{5

0.2

6 + 2'3

1{5

Basic Calculations

Fraction Calculations

Note that the input method for fractions is different, depending upon whether you are using Natural Display or Linear Display.

2 + 1 = 7 3 2 6

or ' 2 c 3 e+' 1 c 2 =

b 2 ' 3 + 1 ' 2 = 7{6

B 2 ' 3 e+ 1 ' 2 =

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4 − 3

b 4 - 3 ' 1 ' 2 = 1{2

Note: • Mixing fractions and decimal values in a calculation while Linear Display is selected will cause the result to be displayed as a decimal value.

• Fractions in calculation results are displayed after being reduced to their

lowest terms.

To switch a calculation result between improper fraction and mixed fraction form: Perform the following key operation: 1f(

To switch a calculation result between fraction and decimal form:

Press f.

1 = 1 2 2

B 4 -1'(() 3 e 1 c 2 =

1 2

)

Percent Calculations

Inputting a value and pressing 1((%) causes the input value to become a percent.

150 × 20% = 30 150 * 20 1((%)=

Calculate what percentage of 880 is 660. (75%) 660 / 880 1((%)=

Increase 2500 by 15%. (2875) 2500 + 2500 * 15 1((%)=

Discount 3500 by 25%. (2625) 3500 - 3500 * 25 1((%)=

2875

2625

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 is the input format for a sexagesimal value: {degrees} $ {minutes} $ {seconds} $.

Note: You must always input something for the degrees and minutes, even if they are zero.

2°20´30˝ + 39´30˝ = 3°00´00˝ 2 $ 20 $ 30 $+ 0 $ 39 $ 30 $=

Convert 2°15´18˝ to its decimal equivalent. 2 $ 15 $ 18 $= (Converts sexagesimal to decimal.) $ 2.255 (Converts decimal to sexagesimal.) $ 2°15´18˝

3°0´0˝

2°15´18˝

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Multi-Statements

You can use the colon character (:) to connect two or more expressions and execute them in sequence from left to right when you press =.

3 + 3 : 3 × 3 3 + 3 S7(:) 3 * 3 = = 9

Using Engineering Notation

A simple key operation transforms a displayed value to engineering notation.

Transform the value 1234 to engineering notation, shifting the decimal point to the right. 1234 =

W 1.234×10 W 1234×10

Transform the value 123 to engineering notation, shifting the decimal point to the left. 123 =

1W(←) 0.123×10 1W(←) 0.000123×10

1234

123

Calculation History

In the COMP, CMPLX, or BASE-N Mode, the calculator remembers up to approximately 200 bytes of data for the newest calculation. You can scroll through calculation history contents using f and c.

1 + 1 = 2 1 + 1 = 2 + 2 = 4 2 + 2 = 4 3 + 3 = 6 3 + 3 = 6 (Scrolls back.) f 4 (Scrolls back again.) f 2

Note: Calculation history data is all cleared whenever you press O, when you change to a different calculation mode, when you change the display format, or whenever you perform any reset operation.

Replay

While a calculation result is on the display, you can press d or e to edit the expression you used for the previous calculation.

4 × 3 + 2.5 = 14.5 b 4 * 3 + 2.5 =

14.5

4 × 3 − 7.1 = 4.9 (Continuing) dYYYY- 7.1 = 4.9

Note: If you want to edit a calculation when the ' indicator is on the right side of a calculation result display (see “Reading the Display”), press A and then use d and e to scroll the calculation.

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Answer Memory (Ans) /Previous Answer Memory (PreAns)

The last calculation result obtained is stored in Ans (answer) memory. The calculation result obtained prior to the last one is stored in PreAns (previous answer) memory. Displaying the result of a new calculation will move current Ans memory contents to PreAns memory and store the new calculation results in Ans memory. PreAns memory can be used only in the COMP Mode. PreAns memory contents are cleared whenever the calculator enters another mode from the COMP Mode.

To divide the result of 3 × 4 by 30 b

3 * 4 =

(Continuing) / 30 =

123 + 456 = 579 B

123 + 456 =

789 – 579 = 210 (Continuing) 789 -G=

For T

k+2

from T1 to T5. Note however, that T

(Ans = T

= 1 1 =

= T2 + T

k+1

= T

+ Tk (Fibonacci sequence), determine the sequence

= 1 + 1

= 1 and T

= 1. B

= 1, PreAns = T

= 1)

G+SG(PreAns)=

(Ans = T

= T3 + T

= 2 + 1 =

(Ans = T

= T4 + T

= 3 + 2 =

Result: The sequence is {1, 1, 2, 3, 5}.

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= 2, PreAns = T

= 3, PreAns = T

= 1)

= 2)

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