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.

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 ...

Excel has over 475 formulas in its Functions Library, but we've selected the most popular, from date and time functions to mathematics and simple data manipulation.

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