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Getting gout of fraction mode - Casio fx-300ES Calculator

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Press SHIFT [SETUP] 2 to switch to the LineIO mode.

Posted on Nov 07, 2012

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Does Iron Infusion caus Uric Acid in the body

Uric Acid is what causes gout and I know how painful that is. Have a read of these links. You certainly need less iron if you suffer with gout.

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Nov 14, 2016 | Health & Beauty

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My student has this the casio fx 300es, and needs pi to show up as a number not as the pi symbol. How do we do this?

The calculator has two Input/Output Modes: The MathIO and LineIO modes. Line IO is the old input mode where all symbols are written on a single line. MathIO permits fractions to show as they would in a textbook (a horizontal fraction bar and two squares, one on top and the other at the bottom. Pi can be used as Pi and irrational square roots are displayed with the root symbol. etc,,
If you are in MarhIO and you get a result with fractions, radicals, or pi. you can readily convert it to its decimal approximation by pressim the SD key. If you enter some expression with fractions and radicals and you do not want the result displayed with fractions or radicals you press SHIFT = instead of =,
Now if you do not care to have ANYTHING displayed as a fraction, radical or with PI, just set the IO mode to the old LineIO.
To effect that, press SHIFT MODE to enter the SETUP. Select 2:LineIO. From that moment on you will no longer see a fraction, nor a radical nor PI, e,

If you ever reset the calculator, the MathIO mode will be restored as default IO mode.

Sep 12, 2011 | Casio fx-300ES Calculator

1 Answer


To configure the calculator to do fractions, set the Input/Output mode to MathIO.
Press [SHIFT][MODE] to open (SetUp) then select [1:MathIO].
After you set it to MathIO, pressing the fraction key will display a fraction template where you can enter numerator and denominator as you would by hand (horizontal fraction bar). Also, the calculator will display results as fractions and radicals whenever possible.
To perform arithmetic operations on fractions use the regular operation keys (x, +, -, /). The calculator will perform the operations and display the results as fractions (whenever possible).

Aug 15, 2011 | Casio fx-300ES Calculator

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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

How do you display fractions and how do you use the TI89 to solve fraction problems

Hi william_kien,

The Ti 89 solves a lot of fraction problems by being in the right mode and, the use of several commands. One of my first problems here at Fixya was to find a solution for, "How do i convert a decimal answer to fractions prefferably with matrixes."

Here the problem was solved just by being in the EXACT mode.

Another fraction nightmare, so I thought was to solve for, "I want to solve a Binomial Theorem problem!" You have to go to the end of the problem but, I solved it just by the use of the expand command.

The best way to display fraction is in Pretty Print and, in the EXACT mode. Here is a small demonstration of the 3 mode setting in the Ti 89 and, the effect of each to the way a fraction is displayed.

This is a demonstration of the Ti 89 simplifying and, displaying in fractional form in the AUTO mode.


This is a demonstration of the Ti 89 making numbers proper and, displaying them in fractional form while in the EXACT mode.


This demonstration of the Ti 89 not even converting in fractional form and, displaying in the APPROX mode.

You should always use parentheses when entering equations or, fractions into the calculator. Pictured just below you can see how the Ti 89 can miss-interpret what is being entered.

The propFrac command is a great tool to reducing to the simplest form.
propFrac(expression,var). This will return an expression as a
proper expression


Sometime with joining or, combining fractions you have to get the common denominator. As you can see below the comDenom command is a great tool for that.

The Ti 89's ability to compute fractions is only limited to the ability and, knowledge of the person using it. Even though, it has a tendency of making a not so, mathematically inclined person look like they have been doing them all there life.

I just gave several ways I go about solving and, displaying fractions. The best way to display fraction is in Pretty Print and, in the EXACT mode. Sometimes that isn't even enough and, you have to use parentheses and, commands to do the job.

Jan 10, 2011 | Texas Instruments TI-89 Calculator

1 Answer

How do i change my calculator from fraction answers to decimal when i'm dividing

If the fraction has just be typed in, press [SHIFT][=] instead of just [=] to get the result displayed as a fraction. However the fraction displayed will be the irreducible form of your fraction (equivalent but reduced to its simplest terms).

If you do not want fractions at all ( input and output)
Press [SHIFT][MODE] and select [2:LineIO]. This is the entry mode of the old generation of calculators.

The other IO mode is MthIO: In this mode fractions are entered as in textbooks, radicals are also entered as in a textbook. If by any chance you like this new IO format but just want the final results displayed as decimal, you can do your calculations in MthIO to get the result. Once displayed the result can be converted into decimal format by pressing the [S<>D] key.

Aug 26, 2010 | Casio FX-115ES Scientific 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

When I divide, I get a fraction. How do I get a decimal

If your calculator is configured to be in MthIO, the fraction that is displayed is always reduced to its simplest form. (The denominator is the smallest possible.)
If you are adding fractions, the result is also a fraction in its reduced form.
If you want to convert a fraction to a decimal number, press the [S<=>D] key.

To set MthIO: Press [SHIFT][MODE] (SetUp) and select [1:MthIO]
To set LineIO: Press [SHIFT][MODE](SetUp) and select [2:LineIO]
In LineIO, all results are expressed in decimal format.

Jan 26, 2010 | Casio FX-115ES Scientific Calculator

1 Answer


Because the TI84 does supports fractions in a funny way. Tap (3/4+1/2) then tap MATH and tap ENTER twice and you get the answer 5/4.
The TI 89 has a MODE called exact/approximate. In the exact MODE it does fractions; 3/4 + 1/2 = 5/4. In the approximate MODE it does decimals; 3/4 + 1/2 = 1.25

Nov 27, 2009 | Texas Instruments TI-86 Calculator

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