Question about Texas Instruments TI-84 Plus Calculator

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Oooh... What does this button do?!

There is this function on my TI-84+ that I don't know what it does and I asked my AlgII teacher and she don't know, the function is: StartTmr (same spelling and capitalization

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  • Chris P.
    Chris P. May 13, 2009

    I KNOW THAT, but what is it useful for, and how do you reset it?

  • Chris P.
    Chris P. May 14, 2009

    P.S. I do not need any smart @$$ people giving solutions, and I do not have a manual for the TI-84+. And I really want to know how to reset the timer.

  • Chris P.
    Chris P. May 14, 2009

    " much time has elapsed or left"? Dont you mean "...or IS left" ( I used caps because these stupid posts don't have an "italic" setting.)

  • Chris P.
    Chris P. May 15, 2009

    Will somebody PLEASE tell me how to reset the timer? the timer in my TI-84 is currently at approx. 3E6

  • Chris P.
    Chris P. May 20, 2009

    Actually, it is at 3.9E8



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Start Timer !

Posted on May 13, 2009

  • Jerry Naidoo May 13, 2009

    when you write a 1 hour paper , start it , then you will know how much time has elapsed or left. Read the manual.


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StartTmr is used in conjunction with the checkTmr( instruction. When you select startTmr the clock begins. When you select checkTmr it tells you how many seconds have passed since you used startTmr.

Since you do not have a TI-84+ manual, here is a link to download it:


(See pages 570 and 611.)

And here is the main page for support for TI products. It may come in handy.

TI Support

Have a great day!

Posted on May 19, 2009


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1 Answer

How do i use the square root button? I don't know how to use the gray symbols above the buttons.

Press the "2ND" key at the upper-left-hand corner of the keyboard to access the second functions. For example, to calculate the square root of 2, press 2ND [square-root] 2 ENTER.

Aug 26, 2011 | Texas Instruments TI-84 Plus Calculator

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Some of my class set of Ti - 84 silver aren't computing sine and cosine correctly. I've tried clearing RAM and looked at settings. Please help!

I have answered many questions asked by teachers and professors, and very few, if any, deigned to rate the posts. Why do I set myself up for yet another disappointment: I just like to help.

Anyway, the most common source of errors with computation of trigonometric functions is the angle unit. On Ti 83/84Plus (SE) calculators there are two angle units: the degree and the radian.

To verify which angle unit is set as default on a calculator, press MODE. You will see the following screen. The relevant line is the 3rd. On the screen RADIAN is highlighted, meaning that all angle values you feed to trigonometric functions are interpreted as radian measures.
Similarly, all values returned by inverse trigonometric functions are in radians.
I do not know what grades you teach, but if you are doing any differential calculus, the only appropriate unit is the radian. Only for the radian unit is the derivative of sin(x) equal to -cos(x). For the degree, you must introduce a factor to adjust (as a change of variable).

Set all your calculators to use the angle unit you are using in your teaching, and there will be no unexpected results.

Mar 09, 2010 | Texas Instruments TI-84 Plus Silver...

1 Answer

My TI-84 Plus won't graph two functions at once. Only one equal sign highlights. My math teacher doesn't even know what to do and I really need two functions to show on one graph.

Turn the satistical plots OFF
Press [2nd][Y=] (STATPLOT). Select or enter 4: to execute the command [PlotsOff] [ENTER]

Clear the lists (statistical lists)
Press [2nd][0] (Catalog]. Press [PGRM] C. The cursor jumps to the first command in catalog that starts with C (The greek letters in names do not matter). Scroll down a bit to reach the command [ClrAllLists]. Select it and press [ENTER].

Try your graphs again.
If you still have problems, just reset the RAM:
Press [2nd][+] (MEM). Press 7 to select [Reset] then [1:All Ram][2:Reset]. Press [Clear] to erase the Ram Cleard message.

Now you should be able to draw the graphs.

Hope it helps.
Thanks for using FixYa.

Nov 19, 2009 | Texas Instruments TI-84 Plus Calculator

1 Answer

A teacher deleted my apps on accident

If your calculator is registered on the TI site, you can go to the site and probably download them using your cable.

Jul 30, 2009 | Texas Instruments TI-84 Plus Silver...

1 Answer

I have a TI-84 Plus Keypad and I need to know where the STAT CALC button or function is loacted.

Look at the manual all what you need:
Rate me if it's helped.

Jul 07, 2009 | Texas Instruments TI-84 Plus Calculator

1 Answer

TI 83 TI 84 and TI Nspire

Yes, the Ti nspire not only functions as a ti83 but, also operate w/ nice advance math software that any teacher would envey. It comes with the ti83 keypad plus software and great instructions to help the instructor at all levels of math learning. I don't know any better and it is a beautiful plan that ti has set up.

Apr 03, 2009 | Texas Instruments TI-84 Plus Calculator

2 Answers

TI-84 back to factory setting

You actually don't need to restore factory settings for this. I did it accidently and fixed it quickly.

Go to Stat > Edit...

Scroll over until at the bottom of the screen it asks for a name. Press 2nd > 1. L1 should appear, so now, just press enter.

Or just go to Stat > SetUpEditor...

Oct 12, 2008 | Texas Instruments TI-84 Plus Silver...

3 Answers


Please help me to find the answer for my problem with TI-84:
If I'd like to work with: nDeriv(3X^3+2x^.5),X,1)
then I press Enter button, the sreen shows Error...

Please help me to get the answer for this problem. Thank you very much!

Apr 10, 2008 | Texas Instruments TI-84 Plus Calculator

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