Question about Casio fx-300ES Calculator

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My casio fx-300 ES has a problem.

Whever i put in like 2.8+2.8 it shows it as a fraction (28/5). i tried to reset it it didnt work. any advice

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Press SHIFT MODE 2 to switch to the LineIO mode.

Posted on May 14, 2014


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Posted on Jan 02, 2017

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SOURCE: casio fx-83ES

there is a button SD close to AC button, standard - decimal try it .......or
shift+mode format math IO, change it to the other option

Posted on Dec 03, 2008

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SOURCE: problems with fractions on the Casio fx-115es

To convert fractions to decimals or decimals to fractions, you use the [S<->D] key. Each time you press the key the result is displayed in the other format.
Alternatively, If you multiply or divide two integer numbers put a decimal mark at the end of one of the numbers (any one). The result will be displayed in decimal format.

Hope it helps.

Posted on Sep 12, 2009

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SOURCE: changing fractions to decimals

pressing the 'a b/c' key toggles between fraction and decimal formats

Posted on Sep 15, 2009

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SOURCE: Casio FX-115 ES: SIN,COS,TAN (answer isnt correct)

It may be due to the angle unit used. You can have angles in degrees, in radians, and in grads. You should set the default angle unit to waht you problem calls for.
To set degree as default SHIFT MODE 3
To set radians as default SHIFT MODE 4
To set grads as default SHIFT MODE 5

The values of angles calculated by the inverse trigonometric functions are in the default unit that is set . This may be the source of the wrong answers that you get.

Hope it helps.

Posted on Sep 17, 2009

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SOURCE: 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]

Posted on Jan 29, 2010

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Casio-fx300 ES if i enter 2.5+2 it answers as a fraction of 9/2 how do i reset this to calculate correctly

There is a misconception that fraction are less correct than decimal result. Quite the contrary. Calculations with fractions and/or with radicals are exact while decimal calculations are approximate.
Anyway, you want decimals and so decimals you will have.
When a result is displayed in fraction or radical (root form), just press the [SD] key and it will give you the so desired decimal representation.
If somehow you cannot stand the sight of a fraction or a radical, just tell your calculator so.
Press [SHIFT] [MODE] to open (SetUp) screen and press [2:LineIO]

Feb 15, 2011 | Casio fx-300ES Calculator

1 Answer

My Casio fx-115 ES Natural Display is solving 21.9 in a fraction when I put the calculator in scientific mode.... Why?

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.

Oct 07, 2010 | Casio FX-115ES Scientific Calculator

1 Answer

How do I have my casio 115 es give answers as decimals instead of fractions?

To convert a single value to/from fractions, press the S<>D key.

To get all answers in decimal form, press SHIFT [MODE] 2 to select LineIO mode.

Aug 16, 2010 | Casio FX-115ES Scientific Calculator

1 Answer

How to change or put math mode without fractions or scientific notation on calculator fx-155 es natural display

I am not sure what you want because the mathIO mode IS THE ONE THAT DISPLAYS results as fractions.
You have two display modes: MthIO (with fractions, radicals) and LineIO (with decimals). Which one do you want?
To set MthIO press [Shift][MODE][1:MthIO]
To set LineIO, press [SHIFT][MODE][2:LineIO]

Concerning the scientific display mode.
Decimal numbers can be displayed in various formats, Fixed,Scientific, and Normal. If you do not want scientific display of results, just set the mode to Fix(ed) and specify the number of decimal digits. However if a number to be displayed (a result) is too small or too large IT WILL BE DISPLAYED in scientific format regardless of the mode you selected.

May 13, 2010 | Casio FX-115ES Scientific Calculator

1 Answer

How to change or put math mode without fractions or scientific notation on calculator fx-155 es natural display

Press SHIFT MATH 2 to switch to the LineIO mode. You won't see fractions then. However, if magnitude of the number is too large or too small, the calculator will switch to scientific notation in order to fit into the display.

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

2 Answers

When I divide, it turns the answer into a fraction. How do I get back so the answer will be a decimal? With a Casio fx-115 ES

Press the S<>D key, (located right above "DEL"). This will shift the answer from fraction to decimal. This sounds like a pain but having both functions available can be a big plus.

May 20, 2009 | Casio FX-115ES Scientific Calculator

1 Answer


there is a A b/c button. This is the button use to enter fractions. so 4/3 would be entered as 4 |A b/c| 3

If you want to have the answers in fractions as well, then I believe you hit more a few times. And then there should be a display option, in the display option, there should be a b/c. This will show your answers in fractions. Hope it helps

May 05, 2009 | Casio FX-300MS Calculator

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