Q: How to convert a decimal number to a fraction and set the COMP mode on the FX-991W?

Convert a decimal to a fraction: Enter the decimal number (for example, 2.75) Press SHIFT + a b/c The result will be displayed as a fraction (for example, 2 3/4) You can also use the a b/c key to toggle between fraction display and decimal display. Set the COMP mode: Press MODE Select 1 to activate COMP mode COMP mode is the default calculation mode on the FX-991W. It is used for arithmetic calculations, fractions, percentages, and scientific functions. The calculator remembers your last used mode and will return to it on the next startup.

Q: Can I reassign the sustain function to another pedal on the Privia PX-720?

No, the Privia PX-720 is not configurable to reassign the sustain function to another pedal. The keyboard has one pedal jack at the back, specifically designed for the SP-3 pedal (sustain pedal). If your SP-3 pedal is broken, here are your options: Replace the SP-3 pedal - Contact a Casio service center or an authorized dealer to obtain an authentic replacement SP-3 pedal. Use a compatible third-party pedal - Some universal sustain pedals for keyboards may work with the same connector, but check Casio compatibility before purchasing. Check the warranty - If the pedal is still under warranty, contact Casio to request a free replacement. The Privia PX-720 only supports one pedal at a time, so it is not possible to bypass this hardware limitation.

Q: How to identify the variant of my CASIO GRAPH 35+E II according to the EAN code?

The CASIO GRAPH 35+E II comes in two variants identified by their distinct EAN codes: 4549526611735 - Widely distributed variant in France 4549526607769 - Alternative variant depending on destination/distributor Both codes correspond to the same GRAPH 35+E II model with the same features: Python interpreter (Math, Random, Matplotlib, Turtle modules), exam mode (compliant with baccalaureate regulations), 8 lines x 21 characters display, curve plotting, and statistics. The differences may relate to packaging, distribution region, or production batch. To identify your variant: check the EAN code (barcode) printed on the packaging or the sticker on the back of your calculator. No matter which one you have, you will have access to all the features described in the manual.

Q: How do I change the currency of my CASIO TE-2400 from dollars to euros?

To set your TE-2400 cash register to euros, access PGM3 mode (Program 3 - General Control) and modify the Euro settings at address codes 28 and 29. Euro Configuration Procedure Enter PGM3 mode (General Control) Navigate to address codes 28 and 29 Locate the setting "Use Euro only" (marked [C25T] in the documentation) Enter 0 to disable (dollars) Enter 1 to enable Euro The manual also states that an automatic Euro switch execution is possible by arrangement and scheduling if you need a programmed transition. For more technical details, refer to the "Programming for the Euro" sections of your complete documentation.

Q: How to disable the reverb on the CASIO CELVIANO AP-24?

To disable the reverb on your CASIO CELVIANO AP-24: Press and hold the CONTROL button located on the keyboard, then press the key corresponding to the reverb effect you wish to disable. Each type of reverb (ROOM 1, ROOM 2, HALL 1, HALL 2) is assigned to a specific key above the keyboard. Press the same key again to completely disable the effect, or select another type of reverb to replace it. Note that reverb settings vary depending on the selected tone/instrument and are applied automatically when you change instruments.

Q: How to calculate the derivative of a function at a specific value, for example at x = 0?

To calculate the derivative of a function at a specific x value on the CASIO FX-991ES Plus 2nd Edition, use the d/dx (derivative) function. Steps: Press Shift + ∫ (the integral button) to access d/dx Enter your function (example: x³ + 2x) Press → (right arrow) Enter the x value (example: 0) Press = (the calculation takes a few seconds) Concrete example: To find the derivative of f(x) = x³ + 2x at the point x = 0: Press: Shift + ∫ Type: x³ + 2x Press: → 0 (to indicate x = 0) Press: = Result: 2 (this is f'(0)) The calculator will display the value of the derivative evaluated at the requested point.

Q: How to use the % key on the CASIO DF 120 TER and why the result does not display?

On the CASIO DF 120 TER, the % key works in two steps: Enter your calculation (for example: 100 + 50) Press the % key, then the = key to display the result If the result does not appear on the screen, check the following points: Press = after % - The % key alone does not display the result. You must always press = to validate the calculation. Check the calculator selectors - The F/CUT/UP/5/4 selector at the top of the machine controls rounding and the display of decimals. If the result is 0 visible decimal, the number may display without a decimal point. Condition of the LCD screen - The batteries may be low and make the display difficult to read. If nothing appears at all, check the condition of the batteries. Calculation mode - On this model, the percentage works particularly for tax calculations (VAT). Refer to the

Q: What is the purpose of the F/CUT/UP/5/4 selector on the CASIO DF 120 TER?

The F/CUT/UP/5/4 selector located on the side of your CASIO DF 120 TER calculator is a switch that controls the rounding mode and the display of decimals during your calculations. Each position of the selector offers a different behavior: F = Floating point - variable display of decimals according to the result CUT = Truncation - simply cuts off the decimals without rounding UP = Round up - always rounds up 5/4 = Nearest rounding - standard rounding (decimals ≥ 5 round up, others round down) This selector is particularly useful for financial, commercial, or accounting calculations where decimal precision is important. Simply turn the selector to the position corresponding to the desired rounding mode before performing your calculations.

Question 1

How to convert a decimal number to a fraction and set the COMP mode on the FX-991W?

Accepted Answer

Convert a decimal to a fraction:

Enter the decimal number (for example, 2.75)
Press SHIFT + a b/c
The result will be displayed as a fraction (for example, 2 3/4)

You can also use the a b/c key to toggle between fraction display and decimal display.

Set the COMP mode:

Press MODE
Select 1 to activate COMP mode

COMP mode is the default calculation mode on the FX-991W. It is used for arithmetic calculations, fractions, percentages, and scientific functions. The calculator remembers your last used mode and will return to it on the next startup.

Question 2

How to use the COMP mode and set it as default?

Accepted Answer

The COMP mode is the default calculation mode of the CASIO FX-991W. Here’s how to use it and keep it as the default mode:

Accessing the COMP mode

Press the MODE button
Select 1 for COMP mode

The COMP mode allows you to perform simple arithmetic calculations, fractions, percentages, and standard scientific functions.

Setting COMP as the default mode

The COMP mode is already the factory default mode of your calculator. Additionally, the FX-991W automatically remembers the last mode used when the device is turned off. Thus:

If you switch to COMP mode and turn off the calculator, it will restart in COMP mode the next time
To ensure a return to COMP at startup, perform a full reset via the setup menu (this resets all settings to factory state with COMP enabled)

Tip: Check the display - in COMP mode, no specific mode label appears (unlike the SD, REG, or CMPLX modes which display their name).

Question 3

How to calculate a p-value with statistical tests?

Accepted Answer

Your CASIO CFX-9850G Plus calculator has several statistical tests that automatically calculate the p-value. Here’s how to proceed:

Accessing statistical mode

Press MENU
Select 2 : STAT to enter Statistical mode

Choosing your statistical test

The CASIO CFX-9850G Plus offers several tests with p-value calculation:

Z-Test (test of one or two means with known standard deviation)
t-Test (test of one or two means with estimated standard deviation)
Chi-square (χ²) (test of independence)
F-Test (test of equality of variances)
ANOVA (analysis of variance)
Proportion tests (1-Proportion or 2-Proportion)

General procedure

In the STAT menu, navigate to the desired test type
Enter your data or statistics (mean, standard deviation, sample size, etc.)
Define the alternative hypothesis: two-tailed (≠), left-tailed (<) or right-tailed (>)
Press CALC or EXECUTE
The calculator displays the test result, including the p-value

The p-value usually appears in a results menu. A low p-value (typically < 0.05) indicates a statistically significant result.

Question 4

Can I reassign the sustain function to another pedal on the Privia PX-720?

Accepted Answer

No, the Privia PX-720 is not configurable to reassign the sustain function to another pedal. The keyboard has one pedal jack at the back, specifically designed for the SP-3 pedal (sustain pedal).

If your SP-3 pedal is broken, here are your options:

Replace the SP-3 pedal - Contact a Casio service center or an authorized dealer to obtain an authentic replacement SP-3 pedal.
Use a compatible third-party pedal - Some universal sustain pedals for keyboards may work with the same connector, but check Casio compatibility before purchasing.
Check the warranty - If the pedal is still under warranty, contact Casio to request a free replacement.

The Privia PX-720 only supports one pedal at a time, so it is not possible to bypass this hardware limitation.

Question 5

How to identify the variant of my CASIO GRAPH 35+E II according to the EAN code?

Accepted Answer

The CASIO GRAPH 35+E II comes in two variants identified by their distinct EAN codes:

4549526611735 - Widely distributed variant in France
4549526607769 - Alternative variant depending on destination/distributor

Both codes correspond to the same GRAPH 35+E II model with the same features: Python interpreter (Math, Random, Matplotlib, Turtle modules), exam mode (compliant with baccalaureate regulations), 8 lines x 21 characters display, curve plotting, and statistics. The differences may relate to packaging, distribution region, or production batch.

To identify your variant: check the EAN code (barcode) printed on the packaging or the sticker on the back of your calculator. No matter which one you have, you will have access to all the features described in the manual.

Question 6

How do I change the currency of my CASIO TE-2400 from dollars to euros?

Accepted Answer

To set your TE-2400 cash register to euros, access PGM3 mode (Program 3 - General Control) and modify the Euro settings at address codes 28 and 29.

Euro Configuration Procedure

Enter PGM3 mode (General Control)
Navigate to address codes 28 and 29
Locate the setting "Use Euro only" (marked [C25T] in the documentation)
Enter 0 to disable (dollars)
Enter 1 to enable Euro

The manual also states that an automatic Euro switch execution is possible by arrangement and scheduling if you need a programmed transition.

For more technical details, refer to the "Programming for the Euro" sections of your complete documentation.

Question 7

How to disable the reverb on the CASIO CELVIANO AP-24?

Accepted Answer

To disable the reverb on your CASIO CELVIANO AP-24:

Press and hold the CONTROL button located on the keyboard, then press the key corresponding to the reverb effect you wish to disable. Each type of reverb (ROOM 1, ROOM 2, HALL 1, HALL 2) is assigned to a specific key above the keyboard.

Press the same key again to completely disable the effect, or select another type of reverb to replace it.

Note that reverb settings vary depending on the selected tone/instrument and are applied automatically when you change instruments.

Question 8

How to calculate the derivative of a function at a specific value, for example at x = 0?

Accepted Answer

To calculate the derivative of a function at a specific x value on the CASIO FX-991ES Plus 2nd Edition, use the d/dx (derivative) function.

Steps:

Press Shift + ∫ (the integral button) to access d/dx
Enter your function (example: x³ + 2x)
Press → (right arrow)
Enter the x value (example: 0)
Press = (the calculation takes a few seconds)

Concrete example:

To find the derivative of f(x) = x³ + 2x at the point x = 0:

Press: Shift + ∫
Type: x³ + 2x
Press: → 0 (to indicate x = 0)
Press: =
Result: 2 (this is f'(0))

The calculator will display the value of the derivative evaluated at the requested point.

Question 9

How to use the % key on the CASIO DF 120 TER and why the result does not display?

Accepted Answer

On the CASIO DF 120 TER, the % key works in two steps:

Enter your calculation (for example: 100 + 50)
Press the % key, then the = key to display the result

If the result does not appear on the screen, check the following points:

Press = after % - The % key alone does not display the result. You must always press = to validate the calculation.
Check the calculator selectors - The F/CUT/UP/5/4 selector at the top of the machine controls rounding and the display of decimals. If the result is 0 visible decimal, the number may display without a decimal point.
Condition of the LCD screen - The batteries may be low and make the display difficult to read. If nothing appears at all, check the condition of the batteries.
Calculation mode - On this model, the percentage works particularly for tax calculations (VAT). Refer to the

Question 10

What is the purpose of the F/CUT/UP/5/4 selector on the CASIO DF 120 TER?

Accepted Answer

The F/CUT/UP/5/4 selector located on the side of your CASIO DF 120 TER calculator is a switch that controls the rounding mode and the display of decimals during your calculations.

Each position of the selector offers a different behavior:

F = Floating point - variable display of decimals according to the result
CUT = Truncation - simply cuts off the decimals without rounding
UP = Round up - always rounds up
5/4 = Nearest rounding - standard rounding (decimals ≥ 5 round up, others round down)

This selector is particularly useful for financial, commercial, or accounting calculations where decimal precision is important. Simply turn the selector to the position corresponding to the desired rounding mode before performing your calculations.

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