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Frequently Asked Questions

Functions & Procedures


How do I turn OFF the calculator?

On many Casio calculators, you'll find a user-friendly keypad layout where several keys have multiple roles. To shut off your calculator, first hit the [SHIFT] key, which you'll usually find in the keypad's upper-left corner. Following that, press the power key, often marked as [ON], [AC], or [AC/ON]. The fx-991CW has a dedicated ON key. To power this model down, press [SHIFT] + [AC].

How do I convert my fraction answer to a decimal? (or visa versa)

Your calculator may default to providing you with an exact representation of a solution (fractional answer). In many cases, a user may want a decimal answer. When the solution is provided, press the [S-D], [F-D] or [FORMAT] key to toggle between exact and decimal approximation. It is possible to change the math output to always show decimal approximation first in your calculator's settings (e.g. switching MathI/MathO to MathI/DecimalO in the fx-991CW).

My answer contains a root. How do I get a decimal approximation?

Similar to getting a fraction in the solution, Casio calculators typically default to providing an exact representation and will simplify a radical in the answer. When the solution is provided, press the [S-D], [F-D] or [FORMAT] key to toggle between exact and decimal approximation. It is possible to change the math output to always show decimal approximation first in your calculator's settings (e.g. switching MathI/MathO to MathI/DecimalO in the fx-991CW).

How do I adjust my angle unit settings?

To adjust the angle unit settings on your calculator, follow the steps tailored to your specific model:

  • fx-300ES Plus 2 or fx-115ES Plus 2:

    • Press [SHIFT], then press [MODE] (Setup)​

    • Press the key for the desired degree mode: [3] Degrees, [4] Radians, [5] Gradians

  • fx-991CW:

    • Press [SETTINGS], then press [Arrow right] to navigate into "Calc Settings"​

    • Press [Arrow down], then press [Arrow right] to enter "Angle Unit"

    • [Arrow Up] or [Arrow Down] to highlight the desired angle unit, then press [OK] or [EXE]

  • fx-9750GIII or fx-CG50:

    • Press [SHIFT], then press [MENU] (Set up)​

    • [Arrow down] to "Angle" in the settings list

    • Press the function key for the desired mode: [F1] (Degrees), [F2] (Radians), [F3] (Gradians)

Why does the Equals [=] button say Execute [EXE]?

Introduction of an execute key is mathematically appropriate, as using the [=] key was not always used in a mathematically correct manner. It would often be used to enter data or select an option. The execute key works for all apps as either an ‘enter’ key or in order to execute a calculation. 

How do I clear my calculator's memory for testing purposes?

  • fx-9750GIII or fx-CG50:

    • Press [MENU] and navigate to "System" menu (or press [G])​

    • Press [F2] (Main Memory), then press [F1] (Yes) to confirm action

    • Press [EXIT] to complete the action

  • fx-991CW:

    • Press [SETTINGS] and [Arrow down] to "Reset" then press [Arrow right]​

    • [Arrow down] to "Initialize All" then press [Arrow right]

    • With "Yes" highlighted, press [OK] or [EXE]

What is Exam Mode and how do I use it to prepare for a test?

Exam Mode is designed to help calculators comply with the regulations of standardized tests and examinations. When activated, this mode restricts certain functions and features of the calculator to prevent cheating or gaining an unfair advantage during an exam. 

  • How to activate (IB Exam Mode):

    • Press [SHIFT], then press [AC/ON] to power down the calculator.

    • Press [7], [COS], and [AC/ON]. When performed correctly, a confirmation message should appear

    • Press [F1] (Yes) to confirm, then [EXIT]

  • How to activate (Texas/US Exam Mode):

    • Press [SHIFT], then press [AC/ON] to power down the calculator.

    • Press [÷], [+], and [AC/ON]. When performed correctly, a confirmation message should appear

    • Press [F1] (Yes) to confirm, then [EXIT]

  • How to activate (UK Exam Mode - fx-CG50 Only):​

    • Press [SHIFT], then press [AC/ON] to power down the calculator​

    • Press [1], [,], and [AC/ON]. When performed correctly, a confirmation message should appear

    • Press [F1] (Yes) to confirm, then [EXIT]

  • How to activate (NL Exam Mode - fx-CG50 Only):​

    • Press [SHIFT], then press [AC/ON] to power down the calculator​

    • Press [8], [Right Arrow], and [AC/ON]. When performed correctly, a confirmation message should appear

    • Press [F1] (Yes) to confirm, then [EXIT]


Please note that this will limit functionality for 12 hours. To confirm Exam Mode status, observe the [R] icon in the top-right corner of the calculator screen. The fx-CG50 will also feature a green border around the screen for ease of indication.

What are the differences between IB and Texas/US Exam Modes?

The IB Exam Mode, which is available for both the fx-9750GIII and another model, the fx-CG50, limits access to e-Activity, E-CON3/E-CON4, memory, programming, Python, all Add-in applications, and vector calculations. Additionally, on the fx-9750GIII, the Math Output option is also restricted.

The Texas/US Exam Mode, also available on both the fx-9750GIII and the fx-CG50, includes all the restrictions of the IB Exam Mode but adds limitations on Inequality Graph functions. This means that in the Texas/US mode, functions related to graphing inequalities in the GRAPH mode and the inequality graphing commands in the RUN-MAT mode are disabled.​

How do I exit out of Exam Mode prematurely?

Calculators will automatically exit Exam Mode after a 12-hour period, but there are situations in which a user may want to exit this mode to use the calculator in class after an exam. There are two procedures to "break" out of Exam Mode:

  1. Connect the calculator to a computer. Use a USB data cable to connect the calculator to a computer. On the computer, open the calculator drive (USB Mass Storage). On the computer, drag and drop (copy) any file that is on the calculator to a storage drive on the computer. Eject the calculator from the computer. A pop-up message will appear on the calculator to let you know that you have exited Exam Mode.

  2. Connect the calculator to another calculator that is not in Exam Mode. On the calculator that is in Exam Mode ("Calc A"), select the Link app icon in the app menu. Press [F4] (CABLE), then [F2] (3pin). Use the 3-pin/SB-62 cable to connect Calc A to another calculator that is not in Exam Mode ("Calc B"). On Calc A, press [F2] (RECV), and on Calc B, enter the Link icon in the menu and press [F3] (Exam), then [F1] (Unlock), and [F1] (Yes) to confirm. On Calc A, a pop-up message will appear to let you know that you have exited Exam Mode.

Where can I find the pi (π) symbol?

On most models of Casio calculators, pi can be found as a shifted option on the x10^x key. On the fx-991CW, pi can be found as a shifted option on the [7] key. To use, press [SHIFT], [7].Pi can also be found under "Other" in the Catalog menu. For quick access, press [CATALOG], then press [Arrow up], then [Arrow right] or [OK] to enter the menu. [Arrow right] to select pi, then press [OK] or [EXE].

Helpful hint: If users need to access any constants not found on the fx-991CW keypad, select [VARIABLE] and press [OK] to select var 'A.' [Arrow down] to "Edit" and press [OK] or [EXE]. Use the Catalog menu to place the desired constant into 'A' var s
torage, then press [OK] or [EXE] to save it. In any calculation, you can insert the constant quickly by recalling var 'A' with [SHIFT]+[4]. 

Does a USB cable come with the graphing calculator?

Both the fx-CG50 and fx-CG500 come bundled with a USB data cable. The fx-9750GIII does not come bundled with a USB data cable. Users of this calculator will need to obtain a Mini-USB to USB 2.x+ data cable, or a Mini-USB to USB-C data cable. An SB-62 cable for unit-to-unit communication is not bundled with our calculators and must be obtained separately.

Does Casio Education provide free USB cables?

While this was a service we provided in the past, Casio no longer provides free or replacement cables. These accessories can be obtained at low cost from your local store or online.

What is Mathbox?

Mathbox allows for quick and efficient investigation in the classroom. For example, rather than manually carrying out a relative frequency experiment (time consuming), it can be performed on the calculator using virtual dice rolls or coin tosses.


Errors and Issues


I get an error when I try to perform a calculation. Why?

Experiencing an error message during a calculation can be frustrating, but these messages are designed to help pinpoint the issue. Below, we outline common error messages and provide guidance on how to resolve them. For detailed explanations tailored to your specific calculator model, we recommend consulting the user manual.

  • Math ERROR: This message appears if the calculation exceeds the calculator's limitations or involves an undefined operation, like division by zero. To fix this, verify your input values to ensure they're within the accepted range and that the mathematical operations are valid.

  • Syntax ERROR: This indicates a problem with the structure of your input, such as missing parentheses or a misplaced function symbol. Review and correct your expression. Some calculators offer a feature that takes you directly to the error in your expression, typically accessed by pressing the [>] or [Goto] button.

  • Stack ERROR: This error means the calculation is too complex, overloading the calculator's processing capacity. Try simplifying the expression or breaking it down into smaller, more manageable parts.

  • Mem ERROR: Occurs when an operation exceeds the calculator's available memory. Clearing unneeded data from memory can resolve this. Be mindful of the number of variables in your expression, ensuring it doesn't surpass the calculator's variable capacity.

If you encounter an error related to incompatible calculations with your current settings (such as mode, angle unit, or display settings), review and adjust your calculator's Setup menu accordingly. Understanding and addressing these error messages will streamline your calculations and enhance your calculator experience.

How do I get back the Add-in apps after they are deleted?

If the Geometry, Picture Plot, Conversion or Python Add-In icons are missing, try resetting the calculator's Setup Data and/or the Main Memory. Please consult your calculator's specific user guide on how to perform this feature from the System settings. If you accidentally erased the Add-Ins and Storage, it is possible to download the Add-In software and image library from the Casio Education Resource Library. You must create an account in order to access the library.

Note: for the fx-9750GIII, download the .g1a files: Geometry, Physium, Probability Simulator. For the fx-CG50, download .g3a files: Geometry, Picture Plot, Conversion, Physium, Probability Simulator, and 3D Graph.


Once the Add-ins are downloaded to your computer, connect the calculator to the computer with the supplied USB cable as a Mass Storage Device. Drag and drop the Add-in programs directly into the root folder of the calculator (outside of /@MainMem/), then safely disconnect the calculator from the computer.

The calculator screen is too light or too dark to read.

If you're finding the display on your calculator either too faint or too dark to read comfortably, this issue is often related to the contrast settings. Adjusting the contrast can usually resolve this problem and make the screen easier to view. Here's how you can typically adjust the contrast on your calculator:

  • For the fx-9750GIII or the fx-CG50, press [MENU] and navigate to the System settings. Press [F1] to adjust contrast and press [EXIT] when the desired contrast is set.

  • For the fx-300ES Plus 2 or the fx-115ES Plus 2, press [SHIFT]+[MODE] (Setup), then [Arrow down] for more settings, then press [8] (CONT) for contrast settings.

  • For the fx-991CW, tap the [SETTINGS] key and navigate to Contrast to adjust the screen settings.

Battery Check:

If adjusting the contrast doesn't improve the display readability, it could be a sign of low battery power... especially if the screen is dim. Replacing the batteries or recharging the calculator, if it's rechargeable, might resolve the issue.

Environment and Angle:

The readability of some calculator screens can also be affected by ambient lighting conditions or the angle at which you're viewing the screen. Try adjusting your working environment or the angle of the calculator to see if visibility improves.

If after trying these steps the display remains difficult to read, there might be a deeper issue with the calculator's screen or internal components. In such cases, consulting the user manual for troubleshooting tips or contacting customer support.

The calculator is frozen or stuck.

It is possible to write a program or initiate a computation that places the calculator into an infinite loop. Tap the [AC] button repeatedly until the program or calculation terminates. If the calculator is not detecting the [AC] command, depress the restart button on the back of the calculator for five seconds. Optionally, remove the batteries from the device or cover the solar cell until the unit loses power. When the unit turns off, turn the calculator back on to continue normal use.

The calculator won't turn on.

If your calculator isn't powering on, following these steps to troubleshoot and possibly resolve the issue:

  1. Inspect the battery compartment. Remove the existing batteries and check for any corrosion. If there is corrosion, you can gently swab the area with white vinegar or lemon juice mixed with water to neutralize the alkaline leak. Make sure you take proper safety precautions and work in a well-ventilated area. Take great care to ensure that no solution leaks into the internal componentry.

  2. Replace the batteries. Replace the existing batteries with new, fully charged ones. Ensure that the batteries are inserted correctly, with the positive (+) and negative (-) ends aligned according to the battery compartment's indications. 

  3. Hardware reset. If a battery change doesn't resolve the issue, look for the reset button on the back of the calculator. Using a paperclip or a similar small object, gently press the reset button for about five seconds. This can help clear any minor glitches by rebooting the calculator's system.

  4. Contact support. If your calculator still won't turn on after trying these steps, the problem might be more complex and require professional attention. Reach out to Casio Support or the retailer where you purchased the calculator for further assistance or to explore repair or replacement options.

The calculator is damaged. Is it covered under warranty?

Typically most damage from normal wear-and-tear, along with accidental damage such as drops, are not covered under warranty. In general, you will want to consult the Casio limited warranty to learn all the details. If you feel your damage is covered under the warranty, please contact support using the information supplied on the Casio limited warranty page.

The calculator will not simplify equations.

For the majority of our educational models, this is by design. The fx-9750GIII and the fx-CG50 cannot perform symbolic math or simplification such as 3a+5+4a-8 = 7a-3 because if they did, they would be considered CAS ("Computer Algebra System") calculators and would not be allowed for examinations.

The license for my emulator isn't working.

Casio deploys a brand of licensing software that relies on hardware-specific identifiers to generate and validate license keys. Our emulator development team had to recompile our applications to accommodate the new ARM architecture from Apple in 2022. Therefore, any keys purchased today will not be able to validate on older versions of our software. To resolve this issue, fully uninstall the existing software and install the latest version. After this update, it is not required maintain the latest version in order to renew a license—barring any additional architectural challenges.


If you continue to experience an issue in registration after updating the software, please contact the Casio EdTech Division directly so that we can assist in troubleshooting and investigate the cause of the issue.


Sales and Support


I need help! How do I get support?

The EdTech Division typically does not provide product-level support on an individual basis. Visit the Casio Help Center for self-help or to submit a support request.

My school is in the market for calculators. How do I inquire about Casio?

We offer flexible volume pricing for districts looking to purchase Casio products. Schools and teachers can submit a request for a free 30-day quote with no purchase commitments.


If the school decides to move ahead with the purchase, the school will work with our payment facilitator and the units are shipped directly from Casio's national warehouse in Aurora, IL.  Purchases over $35 qualify for free shipping.*


Education customers qualify to receive two free calculators for every 40 of the same models purchased.

* FedEx dock fees may apply in specific circumstances.

My students buy their own calculators. How can I support them?

Many schools across the United States ask that families source their own math supplies based on a teacher recommendation. According to a recent survey, we've found that teacher supply lists are updated less frequently than every four years, and supply lists cite only the brand or model and not the best place to purchase them.

Teachers that apply to receive a referral code can help their students save up to 15% on calculators purchased from all year round. When teachers cite the referral code and on their supply list, parents can shop from only the calculators that the teacher has requested to appear on their personalized Casio shopping page.

Teachers qualify to receive two free calculators for every 40 of the same models purchased using their referral code.

Carts with a value of $25 or more qualify for free economy shipping. This covers all graphing models.

Does Casio offer rebates or incentives on purchases?

We do. Teachers that save their receipts can submit them to us using this form to receive free calculators. For every 40 calculators purchased, we can offer two free calculators of that same model. Teachers may also combine models, but we can only offer two of the least valuable model from each request.

Teachers using a referral code will receive their reward calculators automatically and do not need to redeem Educator Rewards using this form.

Does Casio provide posters for classrooms?

Casio provides digital files in PDF format for free via the Resource Library, but prints must be paid for and sourced individually. We recommend finding a local printer or an office supply store that offers a printing department. If you require different dimensions or file types, please let us know and we will try to accommodate those requests as quickly as possible.


Is Casio approved for _________ exam?

We recommend visiting our Exam Approval Guide to compare calculators and get an accurate understanding of each model's approval status. In general, our graphing calculators are approved for national exams such as the SAT I/II, ACT, AP, and IB along with most statewide testing as long as 1.) the OS is the latest version, 2.) the memory is cleared, and 3.) the calculator is set to Exam Mode.


Can a Casio calculator be used on the SAT if it is taken digitally?

Beginning 2024, the SAT will be taken digitally. There is a digital calculator for portions of the exam where calculator use is permitted on the exam. However, it is recommended that students take their personal calculators to the test location. Handheld calculators are still permitted on the exam, and it alleviates stress for test-takers to compute on a device that is most familiar to them in a high-stakes situation.


How do I get training or tutorials for my math department?

Contact us directly to receive information on how we can provide a training event or sponsor your next faculty meeting. At request, we provide certificates of completion for each attendee at a training event.


What is an "ACE?"

An Affiliated Casio Educator ("ACE") is a professional that has received specialized training in using Casio products effectively in an educational setting. ACE assists Casio by creating resources, activities, and other content that helps teachers attune Casio products to their existing course material and lessons. To apply for ACE membership, fill out the application form.

I don't need help, but I have a question not mentioned here.

Please contact us directly with your question, or ask us on our Discussion Forum. We're highly responsive and appreciate your interest in Casio.

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