My TI-83 has the result that ln10E4 is 11.51 when it should be 9.2. Is there a different setting under MODE that I need to change?

Make sure you have the proper angle mode set. Press MODE and check the third line.

Press "Mode" to go into your settings. Make sure that you are not set to graph "Polar" coordinates. If you are, change the setting back to "Func" or "Function".

When you reach the FLOAT line and see the string of numbers 01 234 etc. you are supposed to use the right arrow to highlight one of the numbers in the string of digits. If for example you highlight the number 4 and validate, your results will be displayed with 4 decimal places.

Your calculator is set to display results in engineering notation, where the exponent is always a multiple of three. To change the display notation, press the MODE button. Use the arrow keys to make your selection. You probably want to highlight "Normal" on the top line, press ENTER, highlight "Float" on the second line, press ENTER. Press 2ND [QUIT] to exit the mode screen.

You can download the manual from the manufacturer's web site at
http://education.ti.com/calculators/downloads/US/Software/Download/en/6124/6408/83m$book-eng.pdf

That is its default mode. If you want results in fraction format, type in the expression and before pressing the [enter] key, press [MATH] then select [1:>Frac] and press [ENTER].

That key gives theta when the calculator is set to polar graphing mode. It gives X in the function mode, T in the parametric mode, and n in the sequence mode.

To change the mode, press MODE to bring up the mode screen. Use the arrow keys to move to the fourth line and highlight the desired mode. Press ENTER to make the change, then press 2ND [QUIT] to exit the mode screen.

Press MODE to enter the mode editor. Scroll to the second line and select FLOAT or a larger number of digits than the 2 it appears to be in now.

You can download a Guidebook from http://education.ti.com

Hello,
Press [MODE]. Use arrow down to go to second line Float. Use left arrow key to move cursor to a number other than zero and press [ENTER]. If you highlight 2 your results will have 2 decimal digits, but if 0 is highlighted all results will be integers (no decimals).
Hope it helps.

I was having the same problem...I found the info below on another blog and it helped me fix my calculator problem. Take out all the batteries, hold the DEL button and put the batteries back in (keep holding the DEL button until all batteries are put back in). This will restart the calculator and restore it to its default settings...but it makes it work again!

"Reflashing the OS is probably the thing to do now. I think there's some trick that throws the calc into OS receiving mode. Hold down DEL while putting the batteries in? I don't remember if that's it. Go to 1-800-TI-CARES/[email protected] if you need specifics on getting the calc to take an OS upload given the state it's in."

here are the steps in changing it from radian to degrees
1. turn on your TI-83 plus
2. press the MODE button near the top of your calculator
3.go down to options and move the highlight from radian to degree, press enter and clear
you're good to go