How are these numbers calculated?

Big Games

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

Week of 10/23None
Week of 10/30100.0*Average seed
Gremio 0 Corinthians 3 +0.1
Corinthians 0 Atletico-MG 4 -0.1
Cruzeiro 2 Vasco da Gama 1 -0.1
Week of 11/7100.0*Average seed
Corinthians 3 Coritiba 2 +0.3
Corinthians 1 Ponte Preta 2 -0.1
Santos 3 Cruzeiro 3 +0.1
Cruzeiro 5 Parana 2 -0.1
Points
Chance Will Make Playoffs