Half of 8 is…3?

First, download the math quiz to use for your performance and then make sure to check out this comical trick!  

Not many tricks can be done over the phone.  This is one! You and your friend alternate turns, each selecting a number from 1-9.  The object of the game is to be the first to have 3 of your numbers total 15.  You have a secret strategy that lets you win much of the time.