Question about Casio FX991ES Scientific Calculator

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Fix the mode

I change the mode to comp but it changing automatically to cmplx

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Try a reset SHIFT 9 (CLR) and reset 3:All
Also if Mode:1: COMP gives Complex, maybe MODE:2:CMPLX will give you the usual COMP mode. (wires may be crossed). I have a calculator that has two keys inverted. I made a note of it and keep it taped inside the sliding cover.

Posted on Jan 02, 2014


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Posted on Jan 02, 2017

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SOURCE: I have the casio fx 115 and I am not sure exactly

I get an answer of one.
To clear your calculator back to default, to the following:

CLR (the button 9)
3 (select option 3 = All
= (the equal button)
AC (the red AC button)

Your calculator is now reset to factory settings
Now try your calculation.

Posted on Apr 23, 2009

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How can I reset my Casio FX-115 ES calculator to its default settings

There must be an error in what you report. You pressed MODE then 4: Base-N and now your calculator is in base-N calculation mode (the DEC, Hex, BIN, OCT) numeration keys are active.
To do statistics you must put the calculator in STATS mode.
Press MODE: You have 6 computational modes to choose from
1: COMP, the general computational mode
2:CMPLX, for calculation s with complex numbers,
3: STAT for statistics,
4: Base-N, binary, octal, decimal, and hexadecimal numeration
5: Equation, solving mode, etc..
For statistics, choose 3:STAT

Apr 24, 2012 | Casio FX-115ES Scientific Calculator

1 Answer

When I try to use my calculator it comes up with TRUE/FALSE I have an exam tomorrow and need to fix it! Please help

I wish you had thought it worthwhile to specify the model of your calculator. We cannot possibly know them all. Anyway, if it is a Casio or Casio Clone, the computational mode is set to VERIFY. Change it to the general computational mode COMP. For a Casio, press [MODE] key then [1:COMP].

Jun 26, 2011 | Office Equipment & Supplies

1 Answer

My fx_115ES casio is displaying Dec and I don't know why!

You're in BASE-N mode for integer arithmetic. Press MODE 1 to get to COMP mode for real arithmetic or MODE 2 for CMPLX mode for complex arithmetic.

Apr 04, 2011 | Casio FX-115ES Scientific Calculator

1 Answer

When i type 1-.9909 it will give me scientific notation. then i tried changing the fix mode when it says 0~9 i changed it to 0 but that isnt giving me the correct answer. how do i fix this

"FIX" mode is the number of decimal places, When you say Fix-0 it will truncate the decimals.
Either set model FIX-4 or FIX-5 or better still, just regular COMP mode.
Shift-clr-2 (mode) should set it back to defaults.

Mar 25, 2011 | Casio FX-300MS Calculator

1 Answer

Conversion of polar to rectangular form and vice versa

Conversion of polar form to rectangular:
  • Switch to CMPLX mode: [MODE] [2]
  • Enter complex number in polar form, e.g. r = 3, θ = 42°: 3 [SHFT] [(-)] 42 [=]
  • Switch to rectangular view: [SHFT] [2] [4]
Conversion of rectangular to polar:
  • Switch to CMPLX mode: [MODE] [2]
  • Enter complex number in rectangular form, e.g. real part = 2, imag part = 3: 2 [+] 5 [ENG] [=]
  • Switch to polar view: [SHFT] [2] [3]

Jan 12, 2011 | Casio FX991ES Scientific Calculator

1 Answer

How to get the imaginary numbers on the 115es casio calculator? It is in purple and i cant get it with shift.

You need to be in complex mode before you can do any calculations involving complex numbers. Press MODE 2 to switch to CMPLX mode. When you're done, press MODE 1 to switch back to COMP mode. (Yes, the names are confusing. I didn't pick them.)

Dec 14, 2010 | Casio FX-115ES Scientific Calculator

1 Answer

Casio fx 992s when i try to do simple calculations like 1.33360 - 1.33041.....the answer is 3.19 and other little numbers in the top right. i dont get this or like this. i want a proper 5 decimal...

It sounds like you need a manual for your calculator. You can download a scanned copy here, and it will explain what all the keys are for. For now, here is the way to set the calculator for a five decimal place display:
  1. Press the MODE key three times. A menu offering choices of FIX, SCI or NORM will appear.
  2. Press the 1 key to select FIX mode. The message "0~9?" will appear.
  3. Press the 5 key. This tells the calculator to display five digits after the decimal.
This mode setting will hold until you change it to something else, or when you turn off the calculator.

Spend some time reading the manual and work with the calculator. It's a powerful tool with a lot of capabilities. Thanks for using Fixya!

Oct 08, 2010 | Office Equipment & Supplies

1 Answer

I have the Bin on how can I go back to normal calculator?

Press MODE 1 to select COMP mode (or MODE 2 for CMPLX).

Sep 16, 2010 | Casio FX-115ES Scientific Calculator

1 Answer


The [MODE] key can be used to select the modes described below.
Important! The following is a general explanation of Scientific Calculator modes. Note that your calculator may not include all of the modes described here.
1) Calculation Modes
Before performing a calculation, you first need to select the appropriate calculation mode.
COMP: Basic arithmetric calculations
(arithmetic operations, trigonometric functions, etc.)
COMPLEX: Complex number calculations
SD: Single-variable statistical calculations
(sample standard deviation, etc.)
LR or REG: Paired-variable statistical calculations
(linear regression statistical calculations, etc.)
BASE or BASE-n: Binary, octal, decimal, hexadecimal number system calculations
MAT: Matrix calculations (determinants, etc.)
VCT: Vector calculations
EQU: nth degree equations, simultaneous equations
2) 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.
3) Angle Unit Setting
(90°=?/2 radians=100 grads)
Deg: Degrees
Rad: Radians
Gra: Grads
4) Engineering Mode
Use this mode when you want to input and perform calculations using engineering symbols.

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Sep 08, 2009 | Casio MS-80TV Scientific Calculator

1 Answer

I have the casio fx 115 and I am not sure exactly what modes to keep it in, such as cmplx or comp, and/or deg or rad. I am trying to find e^(0.03*5) but the calculator says syntax error. What is going on?...

I get an answer of one.
To clear your calculator back to default, to the following:

CLR (the button 9)
3 (select option 3 = All
= (the equal button)
AC (the red AC button)

Your calculator is now reset to factory settings
Now try your calculation.

Apr 22, 2009 | Casio FX-115ES Scientific Calculator

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