How are these numbers calculated?

Big Games

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

Week of 11/21100.0*Average seed
Internacional 1 Gremio 0 +0.1
Atletico-MG 2 Goias 2 -0.1
Week of 11/28100.0*Average seed
Gremio 2 Atletico-MG 1 -0.2
Week of 12/6100.0*Average seed
Atletico-MG 3 Chapecoense 0 +0.3
Joinville 0 Gremio 2 -0.2
Points
Chance Will Win Championship