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
Cruzeiro 3 Vasco da Gama 1 -0.3
Avai 3 Atletico-GO 0 +0.0
Week of 11/28100.0*Average seed
Corinthians 2 Vasco da Gama 0 -0.4
Flamengo 1 Cruzeiro 2 +0.1
Atletico-MG 3 Goias 1 -0.1
Ceara 1 Atletico-PR 1 -0.0
Week of 12/5100.0*Average seed
Vasco da Gama 2 Ceara 0 +1.2
Sao Paulo 4 Atletico-MG 0 +0.3
Santos 0 Flamengo 0 +0.1
Atletico-PR 1 Avai 0 +0.1
Points
Chance Will Win Championship