Question about Casio FX-115ES Scientific Calculator

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How do i find mode and median on casio fx-991 es plus?

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Posted on Jan 02, 2017

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SOURCE: my calculator fx-991 Es is showing either syntax

How about recreating the error and reporting faithfully the error message? You get a syntax error if you try to invert a matrix by using the wrong key sequence such a
[SHIFT][MATRIX][3:MatA][X to ] -1), meaning that you use the universal power key on the same row as X squared and log and between them.
To calculate the inverse of a matrix, have the name of the matrix on the command line, (see above) then press [X to -1] key one row up from [log].

Concerning your implied affirmation that if the matrix is square you should not be getting any error: You will get an error ( a Math error) if determinant of the matrix is equal to zero.

Posted on Mar 13, 2010

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SOURCE: How do you switch between degree and radian mode

Press SHIFT MODE to access (SETUP)
Press 3:deg for degree OR
press 4:Rad for radian.

Posted on Apr 05, 2010

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SOURCE: My Casio fx-115 ES Natural Display is solving 21.9

If the calculator is in the MthIO mode it will always attempt to display the result as a fraction. To convert a single result to decimal, press SD. To have the result always come out in decimal (according to the selected display mode), press SHIFT MODE 2 to select the LineIO mode.

Posted on Oct 07, 2010

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SOURCE: how to get the inverse of a matrix an fx-991 ES

The same way you would get the inverse of a number. Assuming you already have the matrix entered into memory, press SHIFT 4 to bring up the matrix menu, select the matrix whose inverse you want, then press the x^-1 key (just to the right and slightly below the big round cursor pad.

Posted on Nov 02, 2010

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Casio fx-991 ES screen brightness decreases when enters more charecters...empty for mode

The display consumes energy. Let the calculator charge completely by exposing it to bright light (sunlight).

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How to calculate the roots of polynomial eqn

Sorry, but this calculator does have the EQN calculation mode. Try the FX-991 ES.

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How can i write this in my calculator example. 2x=10 the answer is x=5 but how can i put x in the calculator

What you want to do is solve the linear equation 2x=10 to find the value of the unknown x that makes the equality true. Solving an equation usually involves rearranging therms, factors and so on. However your calculator was not designed to handle the solution of equations, no matter how simple they are.
Some Casio scientific calculators can solve some types of equations (polynomials of degree 2 or 3, simultaneous linear equations in up to 3 unknowns). These are the FX-115 ES (Plus) and FX-991 ES (Plus C). Other equivalent models are sold in the world under different names.

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Which model of casio csn do integration in limits

The Casios FX-115 ES , FX-115 ES PLus, FX-991 ES, FX-991 ES Plus C can perfom numerical differentiation at a point, and numerical integration between two given limits.

Aug 12, 2013 | Casio FX991ES Scientific Calculator

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Equation mode in casio115W

Sorry, the Fx-115W is unable to solve equations of any type. In addition to that, the more sophisticated Casios such as the FX-991 ES solve linear equations of no more than 3 variables.

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My caiso fx 991-es was dropped and is not working anymore? Anyone with a solution?

It is not worth trying to have it fixed. Just go and buy the newest version the FX-991ES Plus, and do be careful handling it.

Aug 05, 2012 | Casio Office Equipment & Supplies

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Please is there any calculator by model fx 911 ES

Casio has a scientific calculator with Model FX-991 ES. It is sold in North America, and maybe in other continents. You can find it at Staples/ Bureau en Gros stores for around 29 CAD.

Sep 06, 2011 | Casio FX-115ES Scientific Calculator

3 Answers

How to interpolate in CASIO fx 991 ES

its simple
press mode
l x l y l
l 2 l 4.6 l
l 4 l 5.9 l
press; AC
press; shift
press;7 (reg)
press;5 (comma)
u will get ans

Feb 08, 2011 | Casio FX-115ES Scientific Calculator

2 Answers

Steps to draw graphs using Fx 991 ES Plus calculator.


There are many different functions...

You can download the entire manual after answering a few questions at

after using the dropdown menu for this make and model.

Good Luck!

Oct 18, 2010 | Casio FX-115ES Scientific Calculator

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