This is the one reason why I utilize this because it's absolutely predictable that it will follow a Financial Mathematical Schedule of Principal and Interest Payments, as well as Balance reduction.Because the Amortized Mortgage is absolutely predictable, and I for one follow the RULE "If you can Predict it, you can Profit from it", I actually look to Maximize this within reason.So while I put down 20% for an Investment Property to maintain a level of skin in the game and reduction of risk by having an attractive interest rate, I generally take about mortgages around $1 Million or above.That is because the Mortgage, being paid by my renters, will follow a very predictable path, one which will make me a millions as each one gets reduced or paid off.In fact, if you receive ZERO cashflow but your Million dollar Mortgage disappears in 30 years, you have effectively made an average of $33,333 PER YEAR for 30 YEARS.And, if you consider that the Mortgage Interest is deductible, especially for a Rental Real Estate Business, you have earned even more than the Million dollar mortgage.For some reason, this kind of thinking is not taught ANYWHERE that I have seen.

I am a Certified Public Accountant (CPA, Illinois) and Chartered Accountant (CA, Canada), recieved a Bachelor of Mathematics degree, and a Master of Accounting degree from the University of Waterloo located in Ontario, Canada.What is your background and current real estate focus? 

For those of you who've had similar options, what kind of difference do you look for from mathematical perspective in order to decide whether to sell or rent?

That said, there is areas in explosive growth pattern, support by planned city development, and for the smarty-pant's who put int he work to know those plan's ("ehe-hum") appreciation becomes a mathematical item vs guess-work. 

Now, I finally have an explanation that makes perfect sense mathematically.

Mathematically one is probably going to have to buy 5 house to retain one and that one will be free and clear Four properties sold should support the capture costs and the one held unit.

Easy -- 16 is a pretty nice mathematical number. 

Children can learn mathematics, foreign languages and the like from 0-1 year old - look it up on www.youtube.com and be amazed.

But i'm getting better at giving her mathematically backed answers and she's slowly coming around.

I made a big mathematical error I just corrected.I ran the numbers using 30 years of S&P 500 data.