I do not have the directions and need to figure out how to calculate mortgages.

Press 2nd [FORMAT] 9 for floating decimal display mode.

You can also use 0-8 to round to that number of digits after the decimal point.

For a thirty-year, $100,000 mortgage at 8% annually, compute the monthly payment:

2nd [CLR TVM] ( clear the time value of money registers )
3 0 * 1 2 N ( thirty years at twelve payments per year )
8 I/Y ( 8% annual interest )
1 0 0 0 0 0 PV ( $100,000 mortgage )
CPT PMT ( compute payment )

You should see -733.76. The negative indicates payment, the amount is $733.76.

Press 4 y^x 3 =

y^x is the key just above the 9 key.

Pressing 2 0 0 LN = will give you the natural logarithm of 200. If you need the common (base 10) logarithm, divide the result by the log of 10.

( 2 0 0 LN ) / ( 1 0 LN ) =
will give you the common log of 200.

Easy,
2nd>7 (DATA)
X01= put the first figure then ENTER
Down arrow two times
X02= put the second figure then ENTER
Down arrow two times .. and so on
till the list finished
press 2nd>8 (STAT)
down arrow
and find your stastics
ENJOY

You can download the manual from the manufacturer's web site at
http://education.ti.com/calculators/downloads/US/Guidebooks/Detail?id=6114

Check the BEGIN/END setting (2nd [BGN]) and the number of payments per year (2nd [P/Y]). If these are set correctly, could you post the problem you're trying to solve, giving both your results and the expected results?

If $100,000.00 loan: enter 100000. in pv, if interest rate is 5%, enter 5 divided by 12 = %i if 30 year mortgage, enter 360 N enter 2nd PMT to get monthly principle and interest. You may have already solved this problem.

clear your memory by hitting <2nd> then <FV>. It will clear out the memory of any values that may be stuck which will return incorrect answers

http://education.ti.com/educationportal/downloadcenter/SoftwareDetail.do?website=US&tabId=2&appId=6114