How are these numbers calculated?

Big Games

How we did last week and who we should root for this week.   Explain

Week of 8/13100.0*Average seed
Kangaroos 63 Saints 115 +0.1
Bulldogs 60 Cats 161 -0.1
Week of 8/20100.0*Average seed
Cats 121 Blues 79 -0.2
Saints 115 Tigers 94 +0.0
Week of 8/27100.0*Average seed
Cats 112 Eagles 68 -0.1
Crows 65 Saints 37 -0.1
Games Above .500
Chance Will Make Playoffs