How To: Perform an amazing "WTF" magic card trick (using mathematics)

Want to learn a card trick that will blow your mind? This is the one for you, that's why it's called "WTF"! So, watch and pay attention to see how this magic card trick is performed. This is a beginner-style trick, so don't worry if you're no pro— you can still do it! It's more of a mathematical card trick.