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QUICK START GUIDE
fx-991EX
The fx-991EX "ClassWiz" features a high-resolution
display, making it easier to view formulas and symbols.
This remarkable screen can display between 2-6 times
as many characters as other scientific calculators, yet
still runs on solar power.
Use the W key to turn the calculator on, and press
qC(OFF) to power the unit down.
The icon-based menu, accessible via the p key,
allows easy navigation of features using the arrow keys
and the number keys or the Q shortcuts.
The o key can be used like Backspace in a word
processor to delete the character(s) left of the cursor.
The symbols printed on the keys use Natural Textbook
Display™ notation, similar to that found in textbooks.
This makes input of expressions fast and easy.
The n key toggles your calculation results between
Standard (exact) and Decimal forms.
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  • Page 1

    QUICK START GUIDE fx-991EX The fx-991EX “ClassWiz” features a high-resolution display, making it easier to view formulas and symbols. This remarkable screen can display between 2-6 times as many characters as other scientific calculators, yet still runs on solar power.

  • Page 2

    The following explains the meaning of each icon on the fx-991EX icon menu Icon Menu Name Description Perform general computations using Natural Textbook Display™ notation, including CALCULATE absolute value, logs of any base, summation, derivatives, and integrals. Perform computations with complex numbers, including a + bi form, polar ( COMPLEX form, and conversions between the two.

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    Natural Textbook Display™ input/output notation, as found by selecting the Calculate Below are so icon from the Main Menu of the fx-991EX. From the Main Menu, use the arrow keys to highlight the Calculate icon, then press = or press 1.

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    Both - and z are acceptable for use.) In a trigonometry setting, arithmetic can be performed in terms of π. Press a3qKC$4$+ 2qKC=. Other useful Natural Textbook Display™ templates that help overcome typical calculator input frustrations include: logarithms of any base, ia1$2$$16= fx-991EX Quick Start Guide...

  • Page 5

    Press R one or more times to reveal additional Setup options. SOLVE The fx-991EX can elegantly solve an equation for any unknown using Newton’s method with the SOLVE command. To use SOLVE, first input the equation to be solved, then press qr(SOLVE).

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    The solution also displays L – R = 0. This means that Newton’s method of approximation is directly on -5. If L – R is not 0, simply recalculate to get a better approximation. fx-991EX Quick Start Guide...

  • Page 7

    CALCULATE ENGINEERING CALCULATIONS There are many menus in the fx-991EX that can handle engineering calculations. The fx-991EX has the power to handle vectors, matrices, complex numbers and numerically calculates summation and even definite integrals. From the Main Menu, use the arrow keys to highlight the Calculate icon and press p or press 1.

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    Start with a large number like 2.5 X 10 Press 2.5K9p. The gap between digits at place value separation can be viewed by entering Set Up. Press qp(SET UP) and use the arrow keys to navigate to the third menu. fx-991EX Quick Start Guide...

  • Page 9

    To move the decimal to the left, press qbX. Calculating with engineering symbols has never been easier. To turn on the engineering symbols in setup, press qw(SET UP). Select 4(Engineer Symbol)1(On) to turn on the Engineering Symbols. fx-991EX Quick Start Guide...

  • Page 10

    CALCULATE To calculate 500k (kilo) + 10M (Mega), press 500i3(Engineering Symbols) 6(k)+10i3(Engineering Symbols) 7(M)p. The solution is displayed using the appropriate units. Now, use the b key to convert between units. fx-991EX Quick Start Guide...

  • Page 11

    Complex numbers that are multiplied are displayed in complex format. Press (3-2bU) (5+6bU)p. The argument of the complex number 1+2i, can be found by taking the arctan (y/x) = 63.4349° or by using the Argument command. Press i1(Argument)1+2bU)p. fx-991EX Quick Start Guide...

  • Page 12

    Press C2qbZ330iR 2(: a+bi)p. Alternately, simply type in the angle in polar form by pressing 2qbZ330p. These calculations can also be accomplished in radian mode. To change to radian mode, press qp(SET UP)2(Angle Unit)2(Radian). fx-991EX Quick Start Guide...

  • Page 13

    To enter matrices, first, define the matrix. Press 1(MatA)2(Rows)2(Columns) 1p2pz3p4p. To enter a second matrix, press i. From the resulting popup window, press 1(Define Matrix)2(MatB). Select the number of rows, 2(Rows). Select the number of columns, 2(Columns). fx-991EX Quick Start Guide...

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    To calculate the determinant of the matrix, press iR2(Determinant) i3(MatA))p. Matrices can be used to solve a system of equations. Take the following equation with 3 unknowns: Enter the coefficient matrix as Matrix A and the solution matrix as Matrix B. fx-991EX Quick Start Guide...

  • Page 15

    Now, enter the 3 x 1 solution matrix as Matrix B. Press i1(Define Matrix). Define Matrix B 2(MatB) as a 3 x 1, so select 3(Rows) and 1(Columns) from the next two windows. fx-991EX Quick Start Guide...

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    Press C to return to the Matrix Calculation screen. The solution can be found by calculating A x B. Press i3(MatA)uOi4(MatB)p. The solution represents the following: This same system can also be solved using the Equation icon. fx-991EX Quick Start Guide...

  • Page 17

    VECTOR The fx-991EX is capable of handling vector calculations with vectors in 2 or 3 dimensions. From the Main Menu, use the arrow keys to highlight the Vector icon and press p or press 5. Let vectors u and v be defined in the 3-dimensional plane by the following: u = 2i + 3j –...

  • Page 18

    Vector addition, subtractions, and multiplication are all available. For subtraction, press 3(VctA)-i4(VctB)p. For multiplication, press i3(VctA)Oi4(VctB)p. The sums of the product of the components of a vector are known as the vector’s dot product. So, Press i3(VctA)iR2(Dot Product)i4(VctB) fx-991EX Quick Start Guide...

  • Page 19

    VECTOR Even some very complex vector operations like the angle between vectors, which is defined as which are easily accomplished on the fx-991EX. To calculate vector cross product (not vector multiplication), press iR3(Angle)i3(VctA)q)(,)i 4(VctB))p. fx-991EX Quick Start Guide...

  • Page 20

    STATISTICS The fx-991EX can calculate several one-variable statistics, and also analyze relationships between two data sets using various regression models. From the Main Menu, use the arrow keys to highlight the Statistics icon, then press p or press 6. On the resulting menu, select 1 for “1-Variable” statistics.

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    13 different 1-variable statistics have been calculated, 6 of which appear on the first screen. Press R one or more times to reveal additional statistics: These statistics have each been stored inside the fx-991EX as variables, in case you should wish to use them in further calculations.

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    The Statistics Calculation area appears again. Even though nothing appears to have happened, the setting has indeed changed. To access the Data entry area, press i3(Data). Notice a second column for frequencies now appears and the previous data set has been erased. fx-991EX Quick Start Guide...

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    (Notice, the statistics are identical to those previously found.) REGRESSIONS To calculate a linear regression, press i i1(Select Type). Select option 2(y=a+bx). A reminder that changing the type of statistics will clear previous data appears. Press p to confirm and Clear memory. fx-991EX Quick Start Guide...

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    The 2-Variable statistics display calculation results for both x and y: Press Ci4(Regression Calc) to display the linear regression results. Other regressions, including quadratic, logarithmic, exponential, and geometric, can be accessed via i1(Select Type). fx-991EX Quick Start Guide...

  • Page 25

    DISTRIBUTION The fx-991EX can quickly generate probability distribution tables, covering the Normal, Inverse Normal, Binomial, and Poisson distributions. From the Main Menu, use the arrow keys to highlight the Distribution icon, then press por press 7. Several distribution choices appear. Use R to access the second page.

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    Once the final value has been entered, press p again to end the data entry process. Notice, the values of N and p are preserved from the cumulative probability calculation.(N and p are global calculator variables.) fx-991EX Quick Start Guide...

  • Page 27

    4 inches, what range defines the tallest 10% of U.S. males?” Press p once more to reveal the result. To be in the top 10% of U.S. males by height, a man must be over 75 inches (6’3”) tall. fx-991EX Quick Start Guide...

  • Page 28

    Move to cell C1, and press Qr(=) to create an equals sign. Like in other spreadsheet programs, this is the first step necessary when entering a formula. To “grab” the value within a cell, press i2(Grab). fx-991EX Quick Start Guide...

  • Page 29

    A 40 fl oz. bottle of laundry detergent has a mass of 1046.9 grams. Now, let’s use the power of relational formulas to check some other bottle sizes: To populate many different cells with the same value, press i2(Fill Value). fx-991EX Quick Start Guide...

  • Page 30

    $$$$$$o6pp. Scroll down to cell B6 to make sure that the formula has been adjusted relative to each cell’s position, so that cells B2 to B6 now display bottle sizes from 75 to 175 fl oz. fx-991EX Quick Start Guide...

  • Page 31

    So, for example, a 175 fl oz. bottle of laundry detergent has a mass of about 4.5 kg. A decent amount of data has been entered now. To check how much free space remains in ClassWiz’s memory, press i4(Free Space). fx-991EX Quick Start Guide...

  • Page 32

    If one of each of these bottles was purchased, what is the total weight of laundry detergent purchased that would be placed in a car? Navigate to cell D7, and press i. Return again to the summary statistics calculation screen (RRR) and select 4(Sum). fx-991EX Quick Start Guide...

  • Page 33

    Close the parentheses ()), and press p to calculate the sum of the masses in cells D1 through D6. The bottles would have a total mass of 17404 grams, or about 17.4 kilograms. But this is a mass, not a weight! fx-991EX Quick Start Guide...

  • Page 34

    SPREADSHEET This is one example of the powerful ways in which various features of the fx-991EX can be combined. Begin entering the formula as shown into cell D8 by pressing Qr(=)Qj(D)7. Press q8(CONV) to access the Conversion menu. Select 4(Mass).

  • Page 35

    Press $($$P1000)p. Phew! That’s better. The car is no longer carrying 19+ tons of laundry detergent home. The actual total weight is a much more reasonable 38 pounds. fx-991EX Quick Start Guide...

  • Page 36

    TABLE The Table feature on the fx-991EX is a powerful way to solve a single function or two functions simultaneously. The table range and step is easily customizable. From the Main Menu, use the arrow keys to highlight the Table icon and press p or press 9.

  • Page 37

    To change the step value or change the start and end values of the table, press Cp. Enter the new values and press p to view the table. Use the arrow keys to scroll to the value that gives the maximum volume. fx-991EX Quick Start Guide...

  • Page 38

    If there is already a function present, press C to clear the previous function. Enter the second function as g(x) by pressing xd- 3x+2p. Create a table that has a domain of -5 to 5 with step of 1. fx-991EX Quick Start Guide...

  • Page 39

    There appears to be roots of 1 and 2 for both functions. To determine the behavior between roots, type in a number between 1 and 2, like 1.5. The right end behavior for both functions appears to be increasing towards positive infinity. fx-991EX Quick Start Guide...

  • Page 40

    The fx-991EX numerically solves equations elegantly. It is accomplished with the help of the Natural Textbook Display™ in the Equation/Func mode. The Equation/Func mode uses Newton’s method to find solutions to equations. The fx-991EX has the power to handle Simultaneous Equations with up to 4 unknowns and Polynomial Equations up to the 4th degree.

  • Page 41

    C. To change the type of equation or system size, press i and select from the on-screen menus. The fx-991EX also solves inconsistent systems, both independent and dependent. Enter the displayed inconsistent and independent system Press p to see the solution.

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    EQUATION/FUNC Enter the displayed inconsistent dependent system. Press p to see the solution. To input a larger system of simultaneous equation press i1(Simul Equation)3(Unknowns). Enter the coefficents for each equation and press p to solve. fx-991EX Quick Start Guide...

  • Page 43

    EQUATION/FUNC POLYNOMIAL EQUATIONS The fx-991EX has the computing power to solve polynomial equations up to 4th degree. To start solving polynomial equations, in the Equation/Func icon, press i2(Polynomial). Select the degree of the polynomial. For this example, use a 3rd degree polynomial. Press 3(Degree).

  • Page 44

    EQUATION/FUNC The fx-991EX has the power to solve polynomials in the complex plane. Press i and change the type of polynomial to quadratic (2). Enter the coefficients that appear in the displayed screen into the quadratic template, and press p.

  • Page 45

    Notice, the form of the inequality is written as x < a, b < x < c. If the solution runs off the screen, use the left and right (!$) arrow keys to see the entire solution. fx-991EX Quick Start Guide...

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    NOTES fx-991EX Quick Start Guide...

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    NOTES fx-991EX Quick Start Guide...

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    See the complete line of Casio calculators www.casioeducation.com fx-991EX Quick Start Guide...

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