Opinions expressed by Entrepreneur contributors are their own. How much money do you want to make every year? If you haven’t seriously asked yourself that, you should. Why wouldn’t you learn how to ...

This summer, battle lines were drawn over a simple math problem: 8 ÷ 2(2 + 2) = ? If you divide 8 by 2 first, you get 16, but if you multiply 2 by (2 + 2) first, you get 1. So, which answer is right?