Question about Casio fx-300ES Calculator

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My calculator won't convert to the LineIO mode no matter how many times I try. It was fine two days ago, but now it won't convert back. It's also screwing up answers such as cos(60) = 0.58.... and cos-1(0.5) = 66.6666667. I reckon there is a reset button behind the calculator. I tried clicking it several times. It still won't work. Please help. :)

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First about the last two complaints.
Your calculator angle unit is set to grad ( a full circle = 400 grads) and with that unit cos(60 grads) =0.5877852523. and arc cos(0.5) = 66.66666666......7 grads.
I have no idea why it does not want to be configured in LINEIO. My humble guess is that you may not be going about it correctly. If you are willing to follow the steps I am going to describe, it may solve your problem.
To configure the Input/Output mode,

  1. Set the computational mode of the calculator to COMP
  2. To do so, press MODE and enter the number that corresponds to COMP (maybe 0 or 1: I do not have my calculator in front of me at the moment.)
  3. Once the MODE is set to the general computational mode, press [SHIFT][MODE] to enter (SetUp)
  4. Press [2:LineIO]

Posted on Apr 09, 2011


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1 Answer

I am trying to approximate square roots and need it to come out in a decimal but it won't allow me too.

In MathIO Mode
When you get a result as a radical (root) or a fraction, you can always convert it to its decimal approximate by pressing the [S-D] key. Pressing the [S-D] key a second time usually gives you back the fraction/radical form, but not always.

In LineIO Mode all results are expressed as decimals.

Aug 27, 2011 | Casio FX-115ES Scientific Calculator

1 Answer

Tan(30) in fx-83gt plugs gives sqrt(3) / 3 ? I'm using the default settings. (just powered on the brand new and tried this very first function, my bad :(

This is valid for Casio FX--xxxES series (Natural Display)
The calculator is in MathIO, the default input/output mode. In this IO mode tan(30) is equal to 1/sqrt(3) or rationalized to sqrt(3)/3.To convert it to its decimal approximate press the [S=D] key.
To configure the calculator to use the old LineIO mode, press [SHIFT][MODE] then select [2:LineIO].

Aug 13, 2011 | Office Equipment & Supplies

1 Answer

While using Casio fx-300ES , I am unable to get answers in decimals. For eg. 3/10...should give 0.3, but the answer is again displayed as 3/10. any way to solve this issue?

The calculator has two Input/Output modes: MathIO and LineIO.

LineIO is the old way of entering numbers in calculators and results are always displayed as decimal numbers. Some calculators have a fraction feature and would convert a fraction to a decimal number and back.

In MathIO you enter expressions as you would by hand or as you see them written in textbooks.
In this mode, results are by default displayed as fraction or fractions/ radicals.
To convert the fraction/radical to decimals you just press the [SD] key. If you press again you cycle through all the available display formats.
So you can (if you want) use the MathIO to manipulate expressions and convert only the last result to decimal. By the way, fractions and radicals are generally more accurate than their decimal representations.

If however seeing fractions and radicals is too painful, just set the LineIO as your default mode. To do so press [SHIFT][MODE] to open (SETUP), then select [2:LineIO]

Feb 17, 2011 | Casio fx-300ES Calculator

1 Answer

I have a Casio fx-300ES calculator and everytime i push in a math problem it comes out as decimal form or fraction form. I don;t exactly know whats wrong with it, but it never gives me the right answer to...

I understand your frustration, but believe me there is nothing wrong with your calculator. You just have to invest a minimum amount of time to familiarize yourself with its powerful capabilities.
No matter. Your calculator has to input output modes. MathIO and LineIO. MthIO is new and it allows you to enter expressions as if you were doing it by hand (like in textbooks). LineIO is the old way.

In MthIO your displayed results are fractions or radicals (roots) or a mixture of the two. BUT if the screen cannot fit the fraction or radical form, the calculator will use decimal to display the result.

In LineIO you only have decimals results.

To get fraction or radical results configure the calculator to use MthIO. In this mode, if you want a result converted to decimal, just press the SD key. It will toggle between the two.

To set MthIO, press [SHIFT][MODE] and select [1:MthIO]
To set LineIO, press [SHIFT][MODE] and select [2:LineIO]

Dec 02, 2010 | Casio fx-300ES Calculator

1 Answer

When i try and divide it just gives me the answer back as a fraction

To convert a single result to decimal, press SD. To have all results come out in decimal, press SHIFT MODE 2 to select the LineIO mode.

Oct 09, 2010 | Casio fx-300ES Calculator

2 Answers

How do you change from fraction form to decimal form

Once a result is displayed you can convert it from fraction to decimal by pressing the [S<=>D] key.
Alternatively, press the keys [SHIFT][=] to get a result instead of just [=].
You can also configure Input output mode of calculator to LineIO and you will not get fractions nor radicals, just decimals.
To set LineIO as the default IO mode press [SHIFT][MODE][2:LineIO].

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

1 Answer

I cant calculate floting point value ex:55/2 it appears same 55/2 pls suggest me

Tha calculator has two Input/Output modes: MthIO (also called Natural Display or TextBook display, the default mode) and LineIO the old way where eveything is on a single level line.

In MthIO expression appear as if you write them by hand or as in textbooks: multilevels, fractions are fractions, and roots are radicals. The results are also expressed as a mixture of fractions and radicals.
To set MthIO press [ŜHIFT][MODE] to access the (SETUP) options, thaen select [1:MthIO]

In lineIO, expressions arew typed in on a single level line, fractions are converted immediately to decimal numbers, and so are radicals.
Results are always decimal numbers (Scientific, Fixed, or Normal)
To set LineIO as the default IO mode, press [SHIFT][MODE] to access the (SETUP) options and select [2:LineIO].

If your default mode is set to MthIO, you can still force your result to be a decimal number by pressing not the [=] sign but [SHIFT][=].

If you have a string of calculations that you must to perform to get a single numerical result you can perform all calculations in MthIO, and just before calculating the last result press [SHIFT][=]. You result will be in decimal format.

You can convert any fraction/radical result into a decimal format by pressing the [S<=>D] key between the [ ) ] and the [M+] keys. You can also convert a decimal number into a fraction/radical format (not always because there are limitations to the number of total symbols that can be displayed on screen).

For you the simplest ways to have decimal results is to press the [S<=>D] key after result is displayed or the [SHIF][=] key sequence just before result is calculated.

Feb 11, 2010 | Casio FX-115ES Scientific Calculator

1 Answer

Why does it solve in fractions?

The calculator has two Input/Output modes: the default MthIO (new) and the old LineIO.

  1. In MthIO you enter fractions and radicals as you see them in textbook (multiple levels). Calculations are exact and results are generally a mixture of fractions and radicals.
  2. In LineIO, numbers are entered the old way and all numbers, operations are written on a single line. All fractions and radicals are converted into decimals numbers.

If you use the default MthIO you can let your calculator perform the operations in exact arithmetic. When you obtain the end result, you can easily convert a fraction/radical result into a decimal one by pressing the [S<=>D] key, or press [SHIFT][=] instead of [=].

However if you do not care about the MthIO and its nifty functionalities, you can configure your calculator to use LineIO.

To set LineIO press [SHIFT][MODE][2:LineIO]

Jan 28, 2010 | Casio FX-115ES Scientific Calculator

1 Answer

How do you make it so the answer is decimals not fractions

If you do not want to see fractions and radicals anymore just set the calculator input output (I/O) mode to lineIO:
Press [SHIFT][MODE](SETUP) and select [2:LineIO].

If, however, you appreciate the functionalities of the MathIO that allow you to manipulate fractions, radicals, and other nifty things you could not do before, but just want your final results to be in decimal fornat that can be arranged too.
Here is how
  1. Set the I/O mode to MtahIO: Press [SHIFT][MODE][1:MthIO]
  2. Enter your expressions, and when you are finished press [SHIFT][=]. Your result will be in decimal fornat.
  3. Alternatively, you can calculate your result in MthIO and convert the fractions/radicals to decimals by pressing the [S<=>D] key, the one located between the [)] and the [M+] keys.
  4. Every time you press that key you toggle the display from fractions/radicals to decimal and back.

Jan 22, 2010 | Casio FX-115ES Scientific Calculator

1 Answer

I just bought this fx-115es and am entering 5x3.3= and getting an answer of 33/2, althought it is right how do i get it to answer 16.5

There are several ways you can extract decimal numbers from this fine calculator.

In MathIO Mode

1. Once a fraction or radical is displayed press [S<=>D] button to convert it to decimal. Pressing it again restores the fraction or radical display.
2. Instead of pressing the [=] key to obtain a result, press [SHIFT][=]. The result will be displayed as a decimal number.

In LineIO
If you do not care for exact calculations with radicals and fractions, just change the default mode from MathIO to LineIO. To do so
press [SHIFT]{MODE][2:LineIO]. In this input/output mode all results are decimal.
Please be informed that with this mode you will not be able to access the formula templates that allow you to enter fraction as you see them in textbooks (the natural display format). You lose other neat functionalities also.

As a suggestion, if you like the natural display for input keep it as default, and press [SHIFT][=] to display decimal results or [S<=>D] to convert display to decimal format.

Hope it helps.

Nov 16, 2009 | Casio FX-115ES Scientific Calculator

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