Question about Texas Instruments TI-81 Calculator

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Ti-81 manual I have lost my ti-81 manual-how do i download the complete manual to a disk?

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  • thesincityma Sep 21, 2008

    Someone gave me a TI-80 calculator and it didn't have the directions. Is there a way to get them somewhere?

  • Calc Ghost Nov 07, 2008

    exact same

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Go to http://education.ti.com and search for the Guidebook.

Posted on Feb 17, 2010

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1 Answer

My TI-81 screen is so faint. How do I make it


Turn the calculator on. Press and release the 2ND key. Press and hold the up-arrow key to darken the screen/increase the contrast.

Obviously, to go the other way you use the down-arrow key instead of the up-arrow.

Apr 23, 2010 | Texas Instruments TI-81 Calculator

1 Answer

I have a TI-81 that stop working, I installed the


TI calculators have an annoying habit of dimming the screen when the batteries are changed so that it appears as if the calculator isn't turning on at all. Turn the calculator on (or at least press the ON key). Press and release the 2ND key. Press and hold the Up-arrow key for a few seconds and see whether the screen becomes legible.

Mar 16, 2010 | Texas Instruments TI-81 Calculator

1 Answer

How do i convert decimals to fractions with my


Unfortunately, the TI-81 doesn't have this capability built-in.

Oct 29, 2009 | Texas Instruments TI-81 Calculator

1 Answer

I need to know how to convert decimals to fraction on my TI-81 texas instrument.


Unfortunately the TI-81, unlike later models, does not have this capability built-in. You'll have to find and load a program to do this.

Oct 23, 2009 | Texas Instruments TI-81 Calculator

1 Answer

How do i enter 35 degrees 20 minutes into my TI-81 calculator


As far as I know, the TI-81 doesn't have a degree-minute-second entry mode the later TIs have. But to answer your question, you can always do it as:
 35 + 20 / 60
followed by ENTER if needed.

If you're in Radian mode instead of Degree mode, you'd have to follow up with MATH 6 to specify degrees instead of radians.

Sep 29, 2009 | Texas Instruments TI-81 Calculator

1 Answer

Grandaughter gave me her TI-81. I replaced all


TI calculators have an annoying habit of dimming the screen when the batteries are changed so that it appears as if the calculator isn't turning on. Turn the calculator on (or at least press the ON key). Press and release the 2ND key. Press and hold the Up-arrow key for a few seconds and see whether the screen becomes legible.

Sep 09, 2009 | Texas Instruments TI-81 Calculator

1 Answer

TI-81 manual


  1. Right click the link below
  2. Click Save-As
  3. Save to Desktop, or other location on your computer
  4. Enjoy

http://education.ti.com/downloads/guidebooks/graphing/81/81$bookeng.pdf

Nov 07, 2008 | Texas Instruments TI-81 Calculator

2 Answers

Calculator quick working


Mine did the same thing and I was told by Texas Instruments that I can send it in for repair--for $81 since it is more than 1 year old.

Feb 16, 2007 | Texas Instruments TI-89 Calculator

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