Question about Texas Instruments TI-89 Calculator

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TI-89 decimal to fraction

My answers only come up in decimals but i want to get them in fraction form...what do i need to change?

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  • 60 Answers

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.

Posted on Nov 16, 2009

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1 Answer

Convert decimal fraction to binary


None of these solutions answer his question. When converting a fraction or any number with decimal places to Binary, the TI-89 gives "Error: Domain error." For example, entering .6875 [2ND][MATH][BASE][BIN] does not work. I haven't found a way to do it with built in functions. In order to do these types of conversions, I use the following method.

Convert: 0.6875 to Binary
- left of decimal is a 0, so write down a 0, then a decimal point: (0.)
- multiply .6875 x 2 = 1.375 left of decimal is 1, write a 1: (0.1)
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- drop the 1, multiple .5 x 2 = 1. left of decimal is 1, write a 1: (0.1011).
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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

When I divide the answer is in fraction form not decimal form how do i get it back


There are two options.

1) Whenever you want the answer in decimal form, place a decimal after at least one of the numbers.
For example: instead of using (1/2) use (1/2.)

2) Press the "Mode" button. Scroll down the list that appears until you find "Exact/Approx". If you set it to "Approximate", then it will always give the answer in decimal form. If you set it to "Exact", it will give the answer in fraction form.

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

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Ti89 answers in fraction form not decimal form


This is what I did. Go to Math/ 9.Algebra/ 5.approx(

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try this, press shift mode, then line 10. It will make it permanent. the answer will always be in decimals. if you are using a casio with ES models.

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Press Diamond Enter to convert fractions to decimals.

Jun 14, 2008 | Texas Instruments TI-89 Calculator

1 Answer

My answers are always in fraction form!!!


go to mode and scroll down to exact/approx, exact will give fractions, approximate will give decimal, change it to approximate and press enter twice to save it, that should solve it, let me know of any other questions that you may have

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6 Answers

I want the answer to be in decimal form.


Press "MODE"
then scroll down to "Exact/Approx"
select "approximate"

this will have your answers in decimal as default

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