Question about Casio FX-115ES Scientific Calculator

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Hi, I have a Casio calculator fx-991MS giving me wrong answers!

Hi, I have a Casio calculator fx-991MS and its giving me wrong answers. For example 1/120 my calculator says its 8.3333... but the right answer is 0.0083. How do I fix this?

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  • Anonymous Mar 18, 2014

    How do I find thhe infinity button my fx 991ms

  • Anonymous Mar 18, 2014

    How do I find thhe infinity button my fx 991ms

  • Anonymous Mar 20, 2014

    when I perform a normCDF calculation the answer is always clearly incorrect. For example entering normCDF(-(infinity),16,15,2) gives 0.82467 instead of 0.691

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Hello,
I am only looking for a plausible cause of the error, because I do not believe your calculator can make such a mistake. I think you accidentally activated the Exponential display format and did not pay attention to the small, raised -03 that came at the end of the number displayed. It is a common mistake for those not very familiar with Scientific or exponential notation.

Let us try to reset your calculator to the normal (floating point) format.
Press the [MODE] key a number of times until you reach a screen that has FIX, SCI, NORM and under each one a number (FIX 1, SCI 2), Norm 3). To have the number of decimal place you gave in your result (4 decimal digits), you press 1 to select Fix then 4.

Be aware that scientific calculators usually stop displaying results in floating point format ( 0.0000045 ) if the number is smaller then 0.001. So basically, 0.00099 will be displayed as 9.90-04, -04 being raised above the level, and in smaller size.

Hope it helps.

Posted on Oct 02, 2009

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Posted on Jan 02, 2017

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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


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support.casio.com/pdf/004/fx570MS_991MS_E.pdf

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1 Answer

I have Casio Clacuator fx-991MS and it gives wrong answer like


The answer is correct. It is your understanding of priority of operations that is at fault.
As written your expression is calculated as follows
-2/2600 +10+3.
To ensure that an expression is calculated as you want it, enclose parts of it in parentheses. See the screen capture below.

25980185-fw0trqalyrj320gczymiftl4-4-0.jpg

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I assume you want an exponent. On this calculator you use the ^ key.

For example, enter 3, enter ^, enter 3, = should give you 27.

Let me know if you have any questions.

Good luck.

Paul

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How to convert decimals into fractions in Casio fx-991MS ...?


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How to interpolate with 991MS


i am giving the key input with an example..
example-
at 0, value is 300
at 50, value is 270
so how much at 30...

On 991MS,
Go in Reg mode, for doing that : press Menu,Menu, 2

Enter the values as follows,

0,300 and press M+ key on the calci
(Note: there is a "," in between 0 and 300)

then enter the following,
50,270 and press M+ key

now enter the following input exactly as displayed below:

(30) shift 2 > > > 2 =


you will get the answer as 282.

I hope you got it!!!

LOFT!!!

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1 Answer

Casio 991ms model calci display is very dull some


Hi,
The battery may be depleted and needs to be replaced.

Hope it helps.

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1 Answer

How to calculate calculus problem by a scientific calculator fx-991ms


Hello,
If by calculus problem you mean derivatives of functions, integrals, extrema and such things, I am sorry to inform you that neither the Casio FX-300MS, nor the FX-991MS can handle them. The newer Casio calculator FX-991ES is capable of performing numerical differentiations and integrations. There also graphing calculators by Casio FX-9750G, FX-9860G as well as by Texas Instruments (TI 83 PLUS/TI84PLUS) that are reasonably performant in that area.

Hope it helps.

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M mod n in Casio fx991MS


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

both will give nearly the same answers

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