Time+Value+of+Money

The TI-83 and TI-84 calculators have a TVM solver for solving problems involving the time value of money. When I taught this topic, most of my students had one of these calculators. But since I lacked an emulator or a document camera, I found it difficult to demonstrate this solver during lectures. I designed this GeoGebra worksheet for any teachers who may find themselves in a similar situation, or for students who do not have a TI-83/84 calculator. The current version can only solve for PV, PMT, or FV.

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The seven TVM variables are as follows.
 * **N** The number of payments
 * **I%** The interest rate, as a percentage. It should not be divided by 100.
 * **PV** Present value
 * **PMT** Periodic payment
 * **FV** Future value
 * **P/Y** Payments per year
 * **C/Y** Times per year that interest is compounded

You must press Enter or Tab after entering a value in the input box, or the value will not be updated. Note that inflows of cash are considered positive and outflows are negative.

A tutorial on the TVM Solver is available.

Download this worksheet: Updated 6 Nov 2011 to correctly handle the case of zero interest.