How are these numbers calculated?

Big Games

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

Week of 11/15100.0*Average seed
Gama 4 Atletico-PR 1 -0.3
Sao Caetano 2 Guarani 0 -0.2
Gremio 1 Sao Caetano 2 -0.2
Vasco da Gama 2 Gremio 0 +0.1
Corinthians 2 Atletico-MG 2 +0.0
Week of 11/24100.0*Average seed
Sao Caetano 2 Flamengo 0 -0.1
Atletico-MG 2 Gremio 0 -0.1
Atletico-PR 2 Guarani 2 -0.1
Week of 12/1100.0*Average seed
Sao Paulo 3 Atletico-MG 0 +0.2
Vitoria 2 Atletico-PR 4 +0.2
Points
Chance Will Make Playoffs