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Over the years, I have received numerous questions about financial calculators. I will compile a perform of the most generally asked questions here.

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Q: once using the NPV and also IRR functions, have the right to you explain the optional cash circulation counts part?

A: Sure. That attribute is over there to conserve some data entrance in particular circumstances, and it offer an the same purpose to the frequency note in plenty of other gaue won calculators. If some of your cash flows repeat, climate you can encompass the \"cash flow counts\" array. Allow me give you an example:

What is the present value that the following series of cash flows if the discount price is 8% every year?

100, 200, 200, 200, 300.

Normally, you could solve this difficulty using the NPV role as follows:


but notification that you had to form \"200\" three times in a row. Making use of the \"cash flow counts\" array we can do it favor this:


Either way, girlfriend will find that the existing value is $774.01. However, the second method saves a little bit that typing and also is much less likely to bring about data entry errors. The doesn't yes, really save much time in this an easy example, yet in other troubles it can. Be mindful that if you use the \"cash circulation counts\" array, friend must get in a frequency because that each of the cash operation — even those the don't repeat.

Q: The TI-83 (and other) hands-on tells me to usage lists in the NPV and also IRR functions. Why don't you use them?

I'm a rebel! Seriously, I just think that it is quicker and easier to develop on-the-fly arrays fairly than usage lists. For most of what ns do, I'm not going to reuse a list much more than once or twice anyway. When I execute want to reuse it, I have the right to usually use the editing and enhancing functions to conveniently get that done.

Q: Why to be I gaining an error as soon as I usage the NPV and/or IRR functions?

Well, the depends. Most often, the errors that I view in course are resulted in by somebody no being careful around separating every variable in the function by commas. Every comma the you view (above) is absolutely required. Another frequent cause of errors is neglecting to make the early stage outlay a an unfavorable number. You have to obey the cash flow sign convention whether you room using the TVM Solver or the functions.

Q: exactly how do i calculate the variety of days between two dates using the TI 83?

A: The TI 83 and 83 Plus assistance two date formats, MM.DDYY or DDMM.YY. You calculate the difference in between two work by making use of the dbd (days between dates) duty from the Finance menu. Because that example, to find the number of days between 25 July 2007 and 31 December 2007 you would type:

dbd(08.2507,12.3107) if you space using MM.DDYY


dbd(2508.07,3112.07) if you are using DDMM.YY

Either way, you will discover that there room 128 days in between those 2 dates.

Note the the TI 83 go not permit you come specify a day count basis (e.g., 30/360 or actual/360). The communication is always actual/actual.

Q: just how do I find roots various other than square roots utilizing the TI-83 Plus?

In finance it seems that we space forever calculating miscellaneous roots (cube root, 4th root, 365th root, etc). Fortunately, this is pretty straightforward to carry out if you deserve to remember a simple mathematical rule:

\\<\\sqrtX = X^\\frac1N\\>

So, to calculation the fifth root that 100, we just raise 100 come the 1/5th power. To perform this top top the TI-83 to add type: 100^(1/5) ENTER. In this example, the fifth root that 100 amounts to 2.51189. Note that the parentheses room important, otherwise you would raise 100 to the first power and then division by 5 and also you would obtain 20 as the answer. Using this method you deserve to calculate any type of root.

Q: my calculator only has actually a key to calculate organic logarithms. Exactly how do ns calculate logarithms to various other bases (say, base 10)?

A: many often, in finance, we use natural logarithms (base e), usually abbreviated together Ln(x). However, sometimes we need to use other bases. Convert from basic e to any kind of other base deserve to be done with the complying with formula (I'm converting to base 10):


So, just calculate the organic log of her number (use the LN key), and then division it by the natural log of the brand-new base. For example, Log10(3) = Ln(3)/Ln(10) = 0.478. Keep in mind that the TI-83 to add does have a LOG key for calculating base 10 logarithms. Still, if friend need one more base the above formula will occupational — just readjust the 10 to your selected base.

Q: How can I clean the storage of all variables and also lists?

A: unlike a finish reset (see below) this is pretty safe to do, despite be cautious not come delete any kind of lists or variables the you must save. To clean all memory in a TI 83 or TI 83 Plus:

Press 2nd MEM (that is the second duty of the + key)Select 2Select 1 (All)Scroll through the list and also delete anything that isn't important.

See more: How To Clean Melted Plastic From Stove Top!, Melted Plastic On My Ceramic Stovetop!

Q: How deserve to I completely reset my TI 83 or TI 83 Plus earlier to the factory default settings?

A: Be careful with this as it will remove any programs the you may have actually stored in the calculator. With that disclaimer stated, here's how to reset it:

Press second MEM (that is the second function of the + key)Choose 7 (Reset)Scroll appropriate so the ALL is selectedPress 1Press 2 (Reset, and also read the warnings)

Note the it is possible that a reset may influence the comparison of your screen. If necessary, girlfriend can adjust the contrast of the display on the TI-83 through pressing 2nd and climate the up arrowhead (or down arrow) button. Girlfriend may need to do this repeatedly.