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# FAQs

## How can we help?

# Mathematics

Why do I keep getting an error message when I try to perform arithmetic or trigonometric calculations?

The error messages should indicate what the problem is. See the error message list in your calculator's user's guide for more information.

For example:

Ma ERROR or Math ERROR

Cause: The calculation result is outside of the allowable calculation range or you are trying to perform an illegal mathematical operation (such as division by zero).

Action: Check your input values and adjust them to allow the calculation result to be within the allowable range. If you are using memory for your calculation, make sure that you check the memory value.

Syn ERROR or Syntax ERROR

Cause: The calculation expression is the wrong syntax, or the program you are using contains a syntax error.

Action: Press the <right> or <left> key to display the location of the error, and correct it.

Stk ERROR or Stack ERROR

Cause: The calculation you are performing has caused the capacity of the numeric stack or the command stack to be exceeded.

Action: Simplify your calculation expression. You could also split your calculation expression into two or more parts and execute the parts separately.

Mem ERROR

Cause: You executed a matrix, graphing, or some other operation that caused remaining memory capacity to be exceeded.

Action: Delete memory data you no longer need. Make sure that the number of variables used in your expression does not exceed the number of variables that are available.

Other error messages may appear to let you know that a calculation you are trying to perform is not compatible with your current mode, angle unit, display, or other setting. If this happens, check the setup of your calculator and try again.

Is there anything I need to keep in mind when performing calculations that involve trigonometric functions or angles?

Yes. The calculator has a two or three angle modes, and you need to check to make sure that the currently selected angle mode is the correct one for the type of calculation you are trying to perform. If it isn't, you need to change it.

Determining the Current Angle mode Setting

The "angle" setting on the calculator's setup screen will show one of the three angle unit indicators described below.

Degree:

If "DEG" is on the display, it means that the current angle mode is Degree.

A degree is 1/360 of the circumference of a circle. One degree is represented as 1゜.

The following are calculations that use degrees.

sin 90°= cos 0°=1

Radian:

If "Rad" is on the display, it means that the current angle mode is Radian.

A radian is 1/2πr of the circumference of a circle. Measurement of angles using radians called the "radian system of angular measurement". 1 radian = 360゜/(2π)

The following are calculations that use radians.

sin(π/2)=1 cos (2π)=1

Grad:

If "Gra" is on the display, it means that the current angle mode is Grad. Note that ClassPad300 does not have a Grad angle mode.

A grad is 1/400 of the circumference of a circle.

The following are calculations that use grads.

sin 100 grads=cos 400 grads=1

The following shows the relationship between the three angle modes.

90°=π/2 radians=100grads

Radian is the initial default angle mode for a graphic scientific calculator.

When I try to graph a trigonometric function like Y=sin(X), the graph on my calculator appears as a straight line. What do I need to do to produce the graph of a sine wave?

The following are operations you can perform on your calculator to initialize View Window settings so they are compatible with the currently selected angle mode.

fx-CG Series, fx-9860G Series, CFX-9850 Series (fx-9750G PLUS, fx-9750G):

1. Press [SHIFT] and then [F3] to display the View Window.

2. Press [F2] (TRIG) to initialize input/output graph range settings so they match the current angle mode.

3. Press [EXIT] and then [EXE] to draw the graph correctly.

The calculator shows the results as a fraction. How can I change it to display a decimal answer?

2. Also, using the division button, instead of our fraction button, will display answers as a decimal.

Can I connect my graphing scientific calculator to a projector?

The models: ClassPad 330 PLUS /fx-CG10 /fx-CG20 / fx-9860GII /fx-9750GII /fx-9860G Series

Logarithm of a number to an arbitrary base

logXY = log Y / log X

(log a is the log of

The correctness or validity of this equation can be verified simply. In this way then it is possible to calculate the logarithm of a number to any base with Casio’s scientific/graphical calculators.

Note: With a graphic calculator such logarithms can also be drawn.

The models:

fx-9860GII Series, fx-CG Series

Why aren't powers/exponents being calculated properly when I use the [EXP] key?

To raise a number to a power, use the [^] key.

For example, let us say you want to enter 6 to the 4th power. The proper way to enter this would be:

[6] [^] [4]

The result would be 1,296.

If you instead entered [6] [EXP] [4], then this would be interpreted as 6×(10^4), or 6×10,000, which would be 60,000.

Is there anything I need to remember when performing BASE-N and logical operations?

When I type in radical -1, I get an error.

In the graph scientific calculator, can you draw the expression of any type?

# Graphic Calculators

Why does the display of my calculator look dark?

Next, use the ［left]and [right] cursor keys to adjust contrast.

Does a USB cable come with the fx-CG Series to connect it to the computer?

* Included with the calculator in some areas.

How do I change the default menu settings of the fx-CG Series Calculator? For example, change the calculator from radian mode to degree mode?

How is the fx-CG Series different from a conventional graphing calculator?

New features:

- High-resolution color display with over 65,000 colors
- Natural V.P.A.M. natural input and output mode (For example, when you calculate using the fx-CG Series, you can input a proper fraction, logarithmic function, integral, derivative and matrix in a mathematical expression in the textbook.)

Innovative Picture Plot application for photo and video analysis - Simple to connect to a PC as a USB mass storage device
- Can be connected directly to Casio USB projectors
- The four application software programs have been added in addition to the capabilities of a conventional graphing calculator as follows.
- Conversion
- Picture Plot
- Geometry
- Physium

How do I upgrade to the latest version of fx-CG series Handheld OS?

Can I connect the fx-CG Series to a personal computer?

You can transmit and receive data, and transfer images without using software like USB flash memory that comes with the fx-CG Series and the exclusive cable.

Can I change the color of the points in my scatter plot?

I accidentally erased my Add-in icons (Geometry, Picture Plot, and Conversion) . How do I get those back on my calculator?

If you have deleted your add-ins, please follow these instructions.

- Download the add-ins you require from https://education.casio.co.uk/resources?type=.Add-in
- accept the Agreement if you want to download
- download each add-in you want to replace
- The add-ins are downloaded in compressed (zipped) files
- extract the downloaded add-ins from the zip files
- Connect your calculator to your PC (Windows or Mac) by the USB cable
- press F1 on the calculator to connect to the PC
- open the calculator in a window on your PC. It will appear as a drive; the exact way it appears depends on your operating system. Your OS may open the calculator window automatically.
- Drag the add-ins which you have extracted in step 2 from the PC to the calculator
- Eject the calculator from the PC
- do not skip this step, or the transfer may not work
- Your add-ins will now be available on the Home menu screen

Can the fx-CG Series simplify equations such as 3a+5 + 4a -8 to 7a-3?

When the fx-CG Series is connected to a computer will it display like my calculator?

Can I display more than one statistical graph at a time?

The table I created only produces five coordinate pairs; how do I set it to show more?

How do I conditionally format the cells in the Spreadsheet mode?

When I select an equation in Conic Graphs, I noticed the modify option; what does that do?

# Scientific Calculators

Are the scientific calculators programmable?

No, the fx-991EX, fx-85GTX and fx-83GTX are all non-programmable calculators.

Programmable calculators are fx-5800P and fx-3650P II.

When I perform a calculation on my ClassWiz Series calculator, why does the result appear as a fraction?

The initial default setting of the calculator is MathI/MathO. With this setting, fraction format is given priority for calculation results. ClassWiz lets you change the setting to specify decimal value format for results.

Operation:Press [SHIFT] [MENU] [1] (Input/Output) [2] to change the setting to MathI/DecimalO.

Does ClassWiz have a constant calculation function?

The ClassWiz procedures allow you to check the formula and input values as you perform the calculation.

1. Using the CALC Function

You can temporarily store a formula in memory, and then perform repeat calculation.

Why do results appear in exponential form?

Changing the setting to Norm2 will expand the display range, which will display results without using exponential form.

Example: 1/200

Norm1: 5*10＾-3

Norm2: 0.005

Does ClassWiz support sexagesimal (degrees, minutes, seconds) and time (hours, minutes, seconds) calculation?

Time measures( 1 hour=60 minutes, 1 minute =60seconds) Casio scientific calculators can carry out time calculations as well as angle calculations.

Does ClassWiz support 3-digit separators?

How does the [MODE] key work?

The [MODE] key can be used to select the modes described below.

1) Calculation Modes

Before performing a calculation, you first need to select the appropriate calculation mode.

COMP: Basic arithmetic calculations

(arithmetic operations, trigonometric functions, etc.)

COMPLEX: Complex number calculations

STAT: Statistical calculations

BASE-N: Binary, octal, decimal, hexadecimal number system calculations

2) MthIO/LineIO Settings

Specifies the display format.

MthIO-MathO or MthIO displays input and calculation results using the same format as they are written on Paper.

MthIO-LineO displays input the same way as MathO, but calculation results are displayed in

(ES PLUS Series only)

LineIO causes fractions and other expressions to

3) Display Settings

Use these settings to control how calculation results are displayed.

Note that changing the Fix and Sci settings does not affect internal calculation results.

Norm: Exponential display format and cancels the currently configured Fix and Sci settings.

Fix: Specifies a fixed number of digits to the right of the decimal place.

Sci: Specifies a fixed number of significant digits.

4) Angle Unit Setting

(90°=π/2 radians=100 grads)

Deg: Degrees

Rad: Radians

Gra: Grads

Is it possible to accomplish calculations of complex numbers specially in polar form with scientific calculators?

These kinds of calculations, which are used often in physical and technical fields, are explained here as a supplement to the calculator manual.

**The complex numbers can be represented in two different forms:**

**Rectangular or Cartesian form: z = x+iy (In some notation j may be used instead of i.)**

Polar or Phasor form: z = r<θ or z = |z|e^θi. (In some notations φ may be used instead of θ.)

When an answer is given in fraction form, how do I change that fraction into a mixed number?

2.Operation:[SHIFT][MODE]（SETUP)[DOWN][1] (ab/c)

In "ab/c" Mode the result of an operation is always shown as a mixed number.

Why do I get incorrect answers with problems involving mixed fractions on the fx-ESPLUS series (fx-ES Series)?

For mixed fractions, enter [SHIFT] followed by the fraction key. You can then enter three parts: the integer portion, then the numerator of the fraction, then the denominator of the fraction.