Question about Texas Instruments TI-89 Calculator

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Ti-89 My calculator gives the answer like 37/2.But I want it to tell me as 18.5.How can I do that?

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Divide 37 by 2 but then put a decimal after the two.

Posted on Aug 14, 2008

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Easy! You can do either of the following:

(1) When you already have 37/2 as an answer... Press [F2] algebra, then go down 5: approx (, enter, and finally press in 37/2, enter again, and voila! 18.5....or type in approx(37/2)

(2) When you want your answer in decimal form, but don't want to break it down to two steps.... Press [your argument here] [green diamond button] [enter]

Posted on Jul 23, 2008


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Posted on Jan 02, 2017

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SOURCE: The "Tangent" button on the TI-89 calculator is

Make sure you're in the proper angular mode. You can see the angular mode by pressing the MODE key.

Posted on Feb 23, 2011

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If i Type Square root of 148, i get some wierd decimal, i dont want that. I want a radical like 3 radical 12 i think thats the answer, how do i get it to display that insted everytime for when i type in...

The square root of 148 is 2*sqrt(37), the square of 3*sqrt(12) is 108, but that's not the point.

The TI-84 can't produce results like 2*sqrt(37). It can produce results as fractions but not involving roots. Some other machines, like the TI-89 can, but not the 84.

Sorry if that wasn't the answer you were hoping for.

Nov 07, 2013 | Texas Instruments TI-84 Plus Silver...

1 Answer

My Ti-89 is not giving the right answer for cosine. I typed in the cos(42) and it gave me -.39985 when it is supposed to be posotive .74314. Does anyone know what is wrong?

Nothing's wrong, your calculator is giving you the cosine of 42 radians. If you want the cosine of 42 degrees (which is 0.74314), press MODE, down-arrow to the "Angle" line, press right-arrow, select "2:DEGREE", and press ENTER twice.

Dec 13, 2012 | Texas Instruments TI-89 Calculator

1 Answer

The "Tangent" button on the TI-89 calculator is

Make sure you're in the proper angular mode. You can see the angular mode by pressing the MODE key.

Jan 14, 2011 | Texas Instruments TI-89 Calculator

2 Answers

How to get the exact answer if press enter?

To convert a single answer, press the diamond key then ENTER. To have everything this way, press MODE F2 then scroll down to Exact/Approx and change the setting to APPROXIMATE.

Jun 23, 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

1 Answer

Different answer two different calculators ti-81 and ti89

I had the same problem when I got my first 89, even though it's really a feature and not a problem.

Press the diamond key then enter to get your answer, and it will give you the decimal answer instead of the exact answer like you have been getting. Hope this helps...

Nov 15, 2008 | Texas Instruments TI-89 Calculator

2 Answers

Different answer fro my TI-89 AND MY tI-81

Your TI81 can only perform numerical calculation: It always give uour numbers. The TI89, a more sophisticated calculator, can of course do numerical calculation, BUT ALSO symbolic ones. You ask it for the derivative of sin(x) and it will give you cos(x).
Anyway, if you want a decimal result for you calculation above one of the numbers must have a decimal point (instead of writing 2PI write 2.PI.

The TI 89 can do exact calculations. But if you want approximate results any number in the sequence of operations must have the mark of a decimal. Numbers without decimal marks are considered integers, Integer numbers with a decimal mark are treated as floating point numbers ( meaning decimal).

Hope it clarifies things for you.

Nov 15, 2008 | Texas Instruments TI-89 Calculator

4 Answers


Angle mode, Degree/radian setting, Chapter 2, pg 53 (pg70 of 623) Tan instructions pg 510 (appendix A pg 527 of 623) Here's your manual, download this file:

Jun 07, 2007 | Texas Instruments TI-89 Calculator

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