Question about Casio FX-115ES Scientific Calculator

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How to change a fraction into a decimal

Using a ti 89 titanium calculator

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This is a partial solution for I do not have the TI89 titanium with me.
1. The easiest way is to insert the decimal mark (. dot or , comma) at the end of one of the elements of the fraction (numerator or denominator).

Ex: if you enter 1/2 the calculator displays the fraction 1/2, but if you enter 1./2 or 1/2. or 1./2. it displays 0.5

2. You can also configure the EXACT/APPROXIMATE mode option of the calculator ( Press Mode then scroll till you see exact/approximate) then choose AUTO, EXACT, or APPROXIMATE.

In the EXACT option the calculator will perform exact algebra ( Pi remains Pi not 3.14159... ).
In the APPROXIMATE option, calculations are performed numerically (everything is treated as a decimal number.)

In the AUTO option the calculator will try its best to keep the results as exact as possible :
x/6 + 1/2 yields x/6 + 1/2
x/6. + 1/2 becomes .166666..x +1/2
x/6. + 1./2 becomes .16666..x +0.5

My suggestion ( if you allow me) : Leave the calculator set on AUTO, and convert to decimals as needed by putting the decimal mark at the end of an integer.

I hope it helps.

Posted on Aug 17, 2009

  • k24674 Oct 31, 2009

    Use the MODE key To access calculator configuration. There is an option Exact/Approximate. Select approximate and all calculations will yield decimal results. See enclosed screen capture.





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How do I set my ti 89 to spit out fractions instead of decimals


You can do it per problem by using the exact( function, or you can change the mode so that it always displays fractions by changing EXACT/APPROX from Auto to Exact

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On my TI-89 Titanium when i put 3587/7 it puts it into fraction form. how do i get it to decimal?


You can convert any symbolic result to a numeric result by pressing diamond ENTER. If you want all results to come out numeric, press MODE F2, use the arrow keys to move down to the "Exact/Approx" line, press right-arrow, select "APPROXIMATE", then press ENTER. Press ENTER one more time to save the change and exit.

Jun 01, 2011 | Texas Instruments TI-89 Calculator

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How do i convert a decimal answer to fraction format on a TI 89 titanium.... prefferably with matrixes


It is just a matter of being in EXACT mode. To set your calculator in EXACT mode here's the key sequence. Press [MODE] [F3] [Up Arrow] [Up Arrow] [Right Arrow] [2] [ENTER]. Now when your in the Matrix Editor you can input your numbers in decimal form and, they will be automatically be converted to a fractional format. Pictured below is a matrix that was entered using decimal numbers and, was converted into factional form. Notice at the bottom of the screen the calculator is in EXACT mode.

oneplusgh_5.jpg
Here's the same matrix in the HOME screen.


oneplusgh_6.jpg
Next is the same matrix converted back to decimal numbers. Notice at the bottom of the screen the calculator is in APPROX mode.


oneplusgh_7.jpg
And of course when I turn the calculator back to EXACT mode and, Re-ENTER the decimal formatted matrix in the HOME screen the fractional formatted matrix reappears.
oneplusgh_8.jpg
You can use the propFrac( command but, having in the EXACT mode setting works better.

Dec 06, 2010 | Texas Instruments TI-89 Calculator

1 Answer

My ti-89 will only give me a fraction instead of a decimal answer


If you want to convert a single value, press Diamond then ENTER.

If you want them all in decimal, press MODE, scroll down to Exact/Approx, and change the setting to suit.

Jun 08, 2010 | Texas Instruments TI-89 Calculator

1 Answer

The calculator does not do decimals, it only does fractions.


To convert a single result from fraction to decimal, press Diamond followed by ENTER.

To make the calculator do everything in decimal instead of fraction, press MODE, then F2. Scroll down to "Exact/Approx", then press right-arrow. Change the setting from EXACT to one of the others.

Apr 27, 2010 | Texas Instruments TI-89 Calculator

1 Answer

Okay, so I have a problem where I need to get what 25/3 is...when I put this into my ti-89 titanium from the home screen the only answer it gives me is 25/3, what is up with that? It won't do simple...


If you leaf through the manual with its 500 some pages you will diuscover that your last statement is not quite right.
The "problem" is that the calculator is configured to perform EXACT calculation where fractions are kept as fractions and radicals as radicals.

To have your fractions displayed as decimal numbers ALL THE TIME
Press [MODE][F2]
Use Arrow down to highlight [Exact/Approx
Use right arrow to unfold the menu list and select [3:Approximate]
f8d8665.jpg
Press [ENTER] to save configuration

There are two other ways to convert an exact result into an approximate one
  1. If you enter 25./3 or 25/3. or 25/3. and press [ENTER] the fraction will be displayed as a decimal number (The dot is a decimal mark, and it instructs calculator to perform approximate calculations)
  2. If enter 25/3 without the decimal marks and press [Diamond][ENTER] the result will be decimal.

Feb 17, 2010 | Texas Instruments TI-89 Calculator

1 Answer

TI-89 decimal to fraction


Here is what you do:

1) Press the Mode button.
2) Scroll down the list that appears until you find "Exact/Approx".
3) Change the setting for "Exact/Approx" to Exact.
4) Press enter to save the settings change.

You have three possible settings for "Exact/Approx":
1) Auto - The calculator will try to determine the best format.
2) Exact - The calculator will always give the answer in fraction form.
3) Approximate - The calculator will always give the answer in decimal form.

Nov 15, 2009 | Texas Instruments TI-89 Calculator

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How do I change the settings to get my answers in


if you hit the diamond key before enter you will always get your solution as a decimal

Sep 08, 2009 | Texas Instruments TI-89 Calculator

1 Answer

The calculator won't convert fractions into decimals


Are you using a ti-89? If so, check your mode settings and change Exact to Approximate.

Feb 06, 2009 | Texas Instruments TI-89 Calculator

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