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Over the years, I have actually received countless questions around financial calculators. I will certainly compile a perform of the most generally asked inquiries here.

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Q: once using the NPV and IRR functions, deserve to you describe the optional cash flow counts part?

A: Sure. That attribute is over there to save some data entrance in particular circumstances, and it serves an similar purpose come the frequency note in many other gaue won calculators. If few of your cash operation repeat, climate you can encompass the "cash flow counts" array. Permit me provide you one example:

What is the current value of the following collection of cash operation if the discount rate is 8% per year?

100, 200, 200, 200, 300.

Normally, you can solve this difficulty using the NPV duty as follows:


but an alert that you had actually to type "200" three times in a row. Utilizing the "cash circulation counts" array we have the right to do it favor this:


Either way, friend will discover that the present value is $774.01. However, the second technique saves a tiny bit the typing and is less likely to lead to data entrance errors. That doesn't yes, really save lot time in this straightforward example, yet in other troubles it can. Be conscious that if you use the "cash flow counts" array, you must enter a frequency for each of the cash operation — even those the don't repeat.

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

I'm a rebel! Seriously, I simply think that it is quicker and also easier to produce on-the-fly arrays rather than usage lists. For most of what ns do, I'm no going come reuse a list more than when or double anyway. As soon as I do want to reuse it, I deserve to usually usage the editing and enhancing functions to easily get it done.

Q: Why am I acquiring an error when I usage the NPV and/or IRR functions?

Well, the depends. Many often, the errors that I see in class are brought about by somebody not being careful around separating each variable in the function by commas. Every comma that you check out (above) is for sure required. Another frequent reason of errors is neglecting to make the early outlay a negative number. You need to obey the cash circulation sign convention even if it is you are using the TVM Solver or the functions.

Q: just how do ns calculate the variety of days in between two days using the TI 83?

A: The TI 83 and 83 Plus assistance two date formats, MM.DDYY or DDMM.YY. You calculation the difference in between two days by utilizing the dbd (days in between dates) role from the Finance menu. Because that example, to discover the variety of days between 25 July 2007 and also 31 December 2007 you would type:

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


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

Either way, girlfriend will discover that there are 128 days in between those 2 dates.

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

Q: just how do I discover roots other than square roots using the TI-83 Plus?

In finance it appears that we room forever calculating various roots (cube root, fourth root, 365th root, etc). Fortunately, this is pretty simple to carry out if you can remember a basic mathematical rule:

X = X^frac1N>

So, to calculate the fifth root that 100, we just raise 100 come the 1/5th power. To execute this ~ above the TI-83 plus type: 100^(1/5) ENTER. In this example, the 5th root that 100 equals 2.51189. Keep in mind that the parentheses room important, otherwise you would raise 100 to the first power and then division by 5 and you would gain 20 as the answer. Making use of this technique you have the right to calculate any type of root.

Q: my calculator only has a vital to calculate natural logarithms. Exactly how do ns calculate logarithms to other bases (say, basic 10)?

A: many often, in finance, us use organic logarithms (base e), generally abbreviated as Ln(x). However, occasionally we need to use various other bases. Convert from basic e to any kind of other base deserve to be done with the following formula (I'm convert to base 10):

So, just calculate the herbal log of her number (use the LN key), and also then divide it by the herbal log that the brand-new base. Because that 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 basic 10 logarithms. Still, if you need another base the over formula will occupational — just readjust the 10 to your selected base.

Q: How have the right to I clear the storage of every variables and also lists?

A: uneven a complete reset (see below) this is pretty for sure to do, despite be cautious not come delete any lists or variables that you should save. To clear 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 with the list and delete anything that isn't important.

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Q: How have the right to I completely reset mine TI 83 or TI 83 Plus earlier to the manufacturing facility default settings?

A: Be mindful with this as it will certainly remove any type of programs that you may have stored in the calculator. V that disclaimer stated, here's just how to reset it:

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

Note the it is possible that a reset may affect the comparison of your screen. If necessary, friend can change the comparison of the display on the TI-83 by pressing 2nd and then the up arrow (or down arrow) button. Friend may need to do this repeatedly.