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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  • Casio Master
  • 7,993 Answers

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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then enter the following,
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now enter the following input exactly as displayed below:

(30) shift 2 > > > 2 =


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I hope you got it!!!

LOFT!!!

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