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Used: Very Good | Details
Condition: Used: Very Good
Comment: Great, used condition. Includes calculator ONLY. Tested, working.
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  • Texas Instruments TI-81 Graphing Calculator
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Texas Instruments TI-81 Graphing Calculator

38 customer reviews

Available from these sellers.
  • Large and easy to read 8-line by 16-character display
  • Graphs up to 4 functions and 3 parametric equations
  • Easy-to-use display menus with advanced functions
  • 2.4K byte memory stores up to 37 programs
  • Easy-to-use keyboard layout; protective slide case
30 used from $12.97 1 refurbished from $24.95

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Product Description

Product Description

Educational version of the TI-81 for overhead projector use.

From the Manufacturer

Designed for ease of use, the keys of the TI-81 are grouped by color and physical layout to allow easy location of the key you need. The keys are divided into four zones: graphing keys, editing keys, advanced function keys, and scientific calculator keys.

Features:

  • 8-line by 16-character display
  • Defines, saves, and graphs up to four functions and three parametric equations
  • Enter, save, and manipulate up to three 6x6 matrices
  • Advanced functions accessed through easy-to-use display menus
  • One- and two-variable list-based statistics
  • Saves up to 37 programs in its 2.4K bytes of memory
  • Slide case included
What's in the Box
TI-81 calculator, battery, guidebook, protective slide case

Product Details

Product Manual [4.54mb PDF]
  • Shipping Weight: 9.6 ounces
  • Domestic Shipping: Currently, item can be shipped only within the U.S. and to APO/FPO addresses. For APO/FPO shipments, please check with the manufacturer regarding warranty and support issues.
  • International Shipping: This item is not eligible for international shipping. Learn More
  • ASIN: B00005QT8C
  • Item model number: TI-81
  • Average Customer Review: 3.7 out of 5 stars  See all reviews (38 customer reviews)
  • Amazon Best Sellers Rank:
  • Date first available at Amazon.com: September 4, 1973

Customer Questions & Answers

Customer Reviews

Most Helpful Customer Reviews

15 of 15 people found the following review helpful By Jen M on June 28, 2007
Verified Purchase
You get what you pay for here. I am a cheap college student, and I pay for a cheap calculator. It works wonderfully, but the only thing that is inconvenient for me is the memory this little thing has. If I want to look back to the last equation I put in, it doesn't remember it, unlike new calculators. But, hey, I am totally satisfied because I only needed it for one semester. It does a lot more than my little casio calculator too. To my knowledge it has the functions as a newer one that typical people might use(of course there are sweet programs from the new ones, but most don't use those functions anyway). It works well, especially for the price I paid. :)
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15 of 15 people found the following review helpful By Hong Nhung Nguyen on December 7, 2005
Actually, at first I was a hesitate to buy the ti-81. Finally, I had made the decision to buy it. I find that it's worth every penny. I love it. Trust me, this calculator can do almost everything like the ti-83, except that it doesn't have as much memory as the ti-83 and the ability to transfer info. However, I find that the ti-81 is every easy to use. Not bad at all!!
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8 of 8 people found the following review helpful By Christopher Jb Laws on October 3, 2005
I needed a good graphing calculator quick, and this one really does the job. It's just as good as the later models, don't waste your money on the more expensive ones. The batteries do go pretty quick though. I have to constantly adjust the contrast due to low battery power.
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8 of 10 people found the following review helpful By Robert Gaw on February 22, 2002
If you need a graphing calculator for a calculas class this may do the trick but I recommend the TI-82r a higher model. This calculator did not have the features needed for my college class but it may be ok for a high school class. See what features you need and then buy it. The only good thing about it was you cant beat the price.
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5 of 6 people found the following review helpful By Kevin Wright on January 15, 2002
This graphing calculator is an outstanding bargain for the features that it possesses. The ability to perform so many mathematical tasks is always an added plus. I would highly recommend the purchase of this highly reasonally piece of electronic equipment1
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1 of 1 people found the following review helpful By Mylen J Mundt Jr on January 31, 2015
Verified Purchase
I bought one of these when they first came out. And that one was stolen by a student a couple years ago. I have a TI-92 but when I am tutoring it is way to complicated for my students so I bought an oldie but goodie. And they find it simple And easy to use.
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1 of 1 people found the following review helpful By mellowman on December 11, 2012
Verified Purchase
I was thrilled that my replacement calculator was cleaner than my old one - without the wear and tear I had put on my old one. It works just like my old one - as expected. It is like having a familiar tool again.
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Verified Purchase
I brought this calculator a few weeks ago and my son cannot see the numbers on the screen without squinting. This is unacceptable. People should not be allowed to sell items that are non functioning. Who precheck these items before allowing them to be sold? Seriously!
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