How are these numbers calculated?

Big Games

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

Week of 3/25100.0*Chance in playoffs100.0*Average seed
Nacional 2 Newell's Old Boys 4 -0.3
-0.0
Week of 4/1100.0*Chance in playoffs100.0*Average seed
Atletico Nacional 0 Gremio 2 In
+0.2
Week of 4/8100.0*Chance in playoffs100.0*Average seed
Gremio 1 Nacional 0 +0.0
Points
Chance Will Make Playoffs