How do you learn math?

The only way to learn math is to practice. It's one of those classes where you have to do the problems over and over until your brain just remembers how -- like riding a bicycle, you just have to get up and keep going until you get it right. Memorize your multiplication tables and learn the basic facts on addition, subtraction, and division too. That way, you don't have to think about what the answer will be -- you'll just remember it instantly.