Question about Texas Instruments TI-84 Plus Calculator

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Keys not working

The row of keys including :ln  4  5  6  - does not register in either  first or second mode

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Same thing happened to me except its 7 4 and 1 along with the "apps" "sin" and "," keys and it just registers as a 0. ( when i press those keys it puts in 0 on screen)

Posted on Sep 04, 2008

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Can my calculator do exponent calculations, "LN" calculations, and has memory capability? If so how do I use them?

Yes, yes, and yes.
You may view/download a copy of the manual at Owners Manual User Guide for Sharp el 531x scientific calculator
You'll find examples of exponential and logarithmic calculations in the second column of the second page and the memory instructions in the fourth column of the first page.

Jan 10, 2015 | Sharp el-531x scientific calculator

1 Answer

Where is the ln button located

It's the leftmost key on the third row, marked "LN."

Feb 21, 2014 | Texas Instruments TI 30XIIS Scientific...

1 Answer

How can i use exponents and ln ?

For ln use the LN key on the top row of the keyboard. For e^x use the 2nd function of the LN key.

Dec 30, 2013 | Texas Instruments TI-30XA Calculator

1 Answer

I cannot find the EXP button on my Casio fx-991MS calculator. Where is it?

If you mean "raise e to the power of", it's the shifted function of the "ln" key, third row, rightmost column. If you mean "raise a number to a power" it's the "^" key, third row, third from the right.

Sep 11, 2012 | Calculators

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If log 1000 = 3, how do I do this with my hp 12c calculator

The 12C does not have the common logarithm function built-in, but you can calculate it using the natural logarithm function (the blue g shift of the %T key, 2nd row, 3rd key).

The common logarithm of x is the natural logarithm of x divided by the natural logarithm of 10, or
log x = ln x / ln 10

Press 1 0 0 0 g [LN] 1 0 g [LN] /
and you'll get the result 3.

Jun 06, 2011 | HP 12c Calculator

1 Answer

Where is the e button on a ti-30xa calculator? To find compound interest continuously?

e^x is the 2nd function of the LN key, second from the right on the top row of the keyboard.

Nov 19, 2010 | Texas Instruments TI-30XA Calculator

1 Answer

On the TI-36X, whihc key is the inverse key and

The inverse key is marked "1/x" (second key on the third row). The natural logarithm key is marked "LN" (fourth key on the top row).

Apr 13, 2010 | Texas Instruments TI-36 X Solar Calculator

1 Answer

Hp20s has locked up

If the calculator has locked up you should perform a reset.
  1. Press and hold the [C] (ON/OFF) key
  2. Press and hold the [LN] key (third key from the left on the top row).
  3. Release both keys simultaneously. T
  4. The calculator should display "0.00" (if the number of decimal places is set to two.)
If that does not bring it to life you should perform a full memory reset

  1. Press and hold the [C] (ON/OFF) key.
  2. Press and hold the first key from the left ( the Square root x key) and the first key from the right (the SIGMA+ key ) on the top row.
  3. Release all three keys at the same time.
  4. Calculator should display "ALL CLr".
  5. To clear the message press the [C] (ON/OFF).
  6. The calculator should display "0.00."
If the calculator does not respond as expected,
  • Remove the batteries, and
  • with a metallic coin (and what coin is not metallica) short-circuit the calculator's electrical terminals.
  • Maintain the coin for about ten seconds.
  • Replace the batteries (preferably fresh ones) respecting the diagram inside battery compartment.
  • The Calculator should display "ALL CLr".
  • To clear the message press the [C] (ON/OFF).
  • The calculator should display "0.00."
If the calculator does not respond to the foregoing procedures, remove the batteries and leave them out of the calculator for 24 to 48 hours to drain capacitors.

If it continues to malfunction, it will need to be repaired. One repair shop in Pennsylvania, USA has a website at You should contact them.

Hope it helps.
Thank you for rating the solution.

Nov 05, 2009 | HP 20s Calculator

1 Answer

In need to find the natural log of (27/25). What

Use the [LN] key, the fith key from the bottom, on the first row left to [EE] key
[LN] ( 27/25) [ENTER] . Make sure you put the fraction inside parentheses to prevent the calculator from interpreting it as LN(27)/25.
Hope it helps.

Oct 08, 2009 | Texas Instruments TI-85 Calculator

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