The article 2 Simple Math Formulas You Need to Become a Successful Landlord originally appeared on Fool.com. Try any of our Foolish newsletter services free for 30 days.

Math Formulas is a simple app, but for $1.99 in the iTunes store, it's handy for reminding you of math formulas on the fly.

Profit and Loss Formulas: Check here the list of maths formulas for profit and loss, starting from basic to advanced. Also, download the full Profit and Loss formulas PDF sheet.

Ok, there has to be somewhere online that has a nice list of basic math equations, like how to find the area of a circle, how to find the perimeter of a triangle, etc, etc, etc, all that basic ...

However, these two simple math formulas -- used correctly and consistently -- will place you firmly on the path to real estate investing success.

To be successful in real estate investing, making friends with math is an absolute requirement. Without further ado, here are two simple math formulas that will tell you very quickly whether that ...