Question about Casio FX991ES Scientific Calculator

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How to calculate present value factor of annuity in fx-991es

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Posted on Jan 02, 2017

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SOURCE: how to calculate log value in calculator with different base value

In any scientific calculator log2(n) can be  calculated with either ln or log function as follows
Log2(n)= ln(n) / ln(2)
Log2(n)=log(n) / log(2)

both will give nearly the same answers

Posted on Apr 24, 2009

  • 1 Answer

SOURCE: Inputing factors on a casio fx-115es calculator

Unless I am failing to understand your problem, just combine like terms to get:
9x^2+2x+4 and then enter those coefficients into the quadratic solver.
That will get you the two answers -- both of them will be complex.
If you wanted to turn those two answers into factors (complex) of the original equation simply
change the signs on each and put an x in front.
Of course, the quadratic formula would also work.

Posted on Apr 28, 2009

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SOURCE: mode change

Just so that we know what we are talking about. The natural display is the display mode in which fractions appear on two lines, radicals appear as radicals, log can be calculated in any base, etc. If that is what you understand by Natural Display, we are in agreement.
To set this mode, you turn calculator ON and press [SHIFT][MODE] (setup). The option is called MathIO, and it has the number 1.
Thus [SHIFT][MODE][1:MathIO].
Hope it helps.

Posted on Oct 13, 2009

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SOURCE: how can I calculate a large factorial using casio

There is a function to calculate them for you.

In CAS, or Algebra or Tutor Modes, use the x! option
In Run-Math, press [OPTN][F6] to pan right, then [F1] to access the (PROB) menu then enter option number corresponding to x!
The way it works is as follows
number ! [EXE].
Due to memory limitations, you can calculate factorials of numbers up to 69.

Hope it helps.

Posted on Nov 13, 2009

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SOURCE: how can we do linear interpolation in casio fx-991ES calculator

how solve interpolation by casio fx 991 ex

Posted on Nov 28, 2010

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How to do interpolation in Casio f2f-4800p?

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Jan 05, 2016 | Casio Office Equipment & Supplies

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I've got a casio fx 991plus calculator and I want to know how to use feet and inches in the calculation displays, like how is used meters and centimetres in the display

PDF]fx-570MS/991MS Additional Functions - Support - Casio

Casiodisplay format (Disp) settings while the calculator is in the BASE ... Be sure to checkthe current calculation mode (SD, REG,. COMP ... Use [ and ] to display the expression 4 + 4. Press A ... want to perform scientific function calculations. COMP .

The Casio fx-991es, fx-570es and - Numericana
The Casio fx-991ex succeeds the fx-991es (functionally identical to the ... Both are nonprogrammable nongraphing scientific calculators, with natural ... Side-by-side comparison of the fx-991EX and fx-991ES PLUS. ... Displays QR codes for smartphone use .... Work out a formula for many values of the input variables.

CASIO fx-991MS Calculator Tutorial: Lesson 5- Dealing with ...

Dec 03, 2015 | Casio Office Equipment & Supplies

1 Answer

Calculators fx algebra

The FX-991ES Plus barely handles simple operations on matrices of dimensions up to 3X3. It cannot find eigenvalues or eigenvectors.

Oct 24, 2013 | Casio Brand New-Fx-991es Plus - Scientific...

1 Answer

Save equation fx 991es

In table Mode you can enter the formula for a function and generate a table of values. For a 991ES Plus you can enter two functions. However if you change MODE everything will be erased.
In EQN (equation) there is a certain number of built in formula types you can choose. You will be asked for the coefficients which will be used to solve the equation selected. However if you change MODE your lose what you entered. So basically you cannot save formulas to use as a memory aid (if that is what your intention is.) Sorry.

Jul 19, 2013 | Casio FX991ES Scientific Calculator

1 Answer


If it does not have the FACT key, you must factor by hand: Divide by 2, then by 3, 5, 7 etc.

Apr 24, 2013 | Casio Brand New-Fx-991es Plus - Scientific...

2 Answers

How i can get infinity symbol in casio fx-991es plus calculator

why cant they include infinity symbol ? sometimes i feel my calculator is so dumb !

Nov 16, 2012 | Casio Brand New-Fx-991es Plus - Scientific...

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Can casio fx-991es factor?

No it cannot factor. It does not do symbolic manipulations.If you know a bit of theory of polynomials you can find the roots of the polynomial equation. The calculator has a Solve utility. Once you have the roots, you can use your knowledge about polynomials to carry out the factorization procedure.

Aug 31, 2011 | Casio fx-300ES Calculator

3 Answers


Turn calculator ON. Press [SHIFT] [9] (CLR) and select
  1. Setup,
  2. Memory, and
  3. All.
  4. Then press [=] to execute the reset.
Note: The choices of reset options are those available for the FX-991ES. But the procedure is similar.

Hope it helps.
Thank you for using FixYa and for rating this solution.

Dec 01, 2009 | Casio fx-300ES Calculator

1 Answer


Since you're looking for so much, it sounds like you do not have the users manual for the calculator. You can download it here:


Jan 19, 2009 | Office Equipment & Supplies

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