QUICK START GUIDE
2
nd
EDITION
fx-115ES PLUS
www.casioeducation.com
Press C to clear out anything typed or the entire
screen.
Press z to input a negative value or variable.
To enter a fraction, press a and enter your
numerator and denominator. The n key toggles your
calculation results between Standard and Decimal
forms.
The w key allows you to choose between the 11
different modes on the calculator. qw(SETUP)
allows you to make changes to the calculator settings.
Use the W key to turn the calculator on, and press
qC(OFF) to power the unit down.
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MENU NAME DESCRIPTION
COMP This mode performs general calculations.
CMPLX This mode performs complex number calculations.
STAT This mode performs statistical and regression calculations.
BASE-N This mode performs calculations involving specific number systems (binary, octal, decimal, & hexadecimal).
EQN This mode solves equations.
MATRIX This mode performs matrix calculations.
TABLE This mode generates a numerical table based on one or two functions.
VECTOR This mode performs vector calculations.
INEQ This mode solves inequalities.
VERIF This mode verifies a calculation.
DIST This mode performs distribution calculations.
The following explains the meaning of each mode on the fx-115ES Plus 2nd Edition:
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To calculate and solve basic expressions, press w1 to enter COMP mode.
To make any changes to the calculator settings, press qw(SETUP).
Inputting a Fraction & Converting to Decimal Form:
1. To solve , press
a7$8$+qa2$3$11=.
2. To view the solution as a decimal, press n.
Note: press n again to see the entire decimal answer. Pressing
once more will display the fraction solution again.
To Find the Remainder of a Division Problem:
1.Tondtheremainderof7dividedby5,press
7Qa5=.
COMP MODE
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COMP MODE
Absolute Value:
1.Tondtheabsolutevalueof-4,press
qcz4=.
Exponents:
1. To evaluate 3
4
, press 3^4=.
Roots:
1. To calculate the square root of 25, press
s25=.
2.Tocalculatethecuberootof64,press
q^3$64=.
Storing Variables:
To store a value for any variable, press qJ followed
by a variable, A – F. In this example, we will store a
value of 1 for the variable A.
1. Press 1qJz.
Note: When you store the value for the variable, you do not need
to press the Q key prior to pressing the variable key.
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COMP MODE
Calculating Expressions:
The r key allows you to enter an expression with
variables, assign values for each variable and then
automatically calculate the expression, without having to
storevaluesforthevariablerst.
1. Enter the expression, 3A + B, by pressing
3Qz+Qx.
2. Press r.
3. Enter 5 for A by pressing 5=.
4.Enter10forB by pressing 10=.
5. The values of A and B can be used to solve additional
expressions, without using r.
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Solving Equations (SOLVE):
SOLVE uses Newton’s method to approximate the
solution of equations. SOLVE can only be used in COMP
mode.
Solve y = ax
2
+ b for x, when y = 0, a = 1, and b = -2.
1. Enter the equation by pressing Qn(Y)
Qr(=)Qz(A)Q)(X)d+Qx(B).
2. Press qr(SOLVE) to enter the SOLVE feature.
3. Enter the value for y by pressing 0=.
4.Enterthevaluefora by pressing 1=.
5. Enter the value of b by pressing z2=.
6. Enter an initial value for x, for this example, we will
enter 1, by pressing 1=.
7.ToexitSOLVE,pressC.
COMP MODE
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Inputthefollowingdataandndthelinearregression.
(170,66) (173,68) (179,75)
Entering Data:
1. To enter the data points above, press
w32(A+BX).
2.Enterthex-valuesrst,pressing= after each value.
170=173=179=
3. Use the arrows to move to the top of the y-column
and enter the y-values, pressing = after each value.
66=68=75=
STAT MODE
To start a statistical calculation, press w3 to enter STAT mode and use the screen that appears
to select the type of calculation you want to perform.
Note: When you want to change the calculation type after entering STAT mode, press q1
(STAT/DIST)1(Type) to display the calculation type selection screen.
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STAT MODE
Finding a Regression:
1.Tondtheregressionequation,pressC to clear
the screen.
2. Press q1 to display the Statistics Menu.
3. Press 5(Reg)tondthecoefcientsforthelinear
regression equation.
4.Press1(A)=tondthevalueofA.
5.TondthevalueofB, repeat the process.
Press q152(B)=.
6.Thevaluesofthecorrelationcoefcient(r), the estimated value of X , and the estimated value
of Y can also be found.
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EQN MODE
Example 1:
1. Press 1 to select a simultaneous linear equation
with two unknowns.
2.Enterthecoefcientsforeachtermineachequation
by pressing 1=2=3=2=3=4=.
3. Press = to solve for the variables.
4.PressR to see the solution for y.
5. To solve additional simultaneous equations with
two unknowns, press CC.
Equation Mode can be used to solve simultaneous linear equations with two or three unknowns,
quadratic equations, or cubic equations. Press w5 to enter EQN mode and press the
corresponding number for the desired equation type.
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Example 2: Solve 2x
2
–3x–6=0.
1. To choose a different type of equation to solve,
press w5 to return to the initial Equation screen.
2. Press 3 to select a quadratic equation.
3.Enterthecoefcientsofeachtermandtheconstant
by pressing 2=z3=z6=.
4.Press= to solve for the roots and the minimum.
5. Press R to see the additional information
EQN MODE
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forthedomain-1≤x≤1,bystepof0.5
1.Entertherstfunctionbypressing
Q)d+a1$2=.
2. Enter the second function by pressing
Q)dpa1$2=.
3. Enter the Start, End, and Step values by pressing
z1=1=.5=.
TABLE MODE
TABLE generates a number table based on one or two functions, entered as f(x) and/or g(x). Press
w7 to enter TABLE mode.
Note: Be sure to input the x variable (Q)) when generating a number table. All other variables will be
handled as constants.
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INEQ MODE
INEQ Mode allows you to solve a quadratic inequality or a cubic inequality. Press wR1 to
enter INEQ Mode and select quadratic or cubic.
Solve x
2
+ 2x – 3 < 0:
1. Press 1 to select a quadratic inequality.
2. Press 2 to select the less than inequality.
3.Enterthecoefcientsofeachtermandtheconstant
by pressing 1=2=z3=.
4.Press= to display the solution set.
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VERIF MODE
VERIF Mode allows you to verify whether an input equality or inequality is true or false. Press
wR2 to enter VERIFY Mode.
Verify whether is true or false:
1. Enter the equation by pressing
4s9$q6112.
2. Press = to see if the statement is true or false.
Note: Pressing q6 will bring up a menu of equality or inequality symbols to use.
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NOTES
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NOTES
fx-115ES PLUS 2nd Edition Quick Start Guide
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