How are these numbers calculated?

Big Games

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

Week of 12/4100.0*Average seed
Fluminense 1 Ponte Preta 0 +1.0
Guarani 2 Figueirense 1 +0.2
Internacional 2 Cruzeiro 0 -0.1
Corinthians 3 Vasco da Gama 1 -0.0
Week of 12/11100.0*Average seed
Parana 0 Fluminense 1 +0.6
Figueirense 1 Juventude 0 -0.2
Ponte Preta 1 Internacional 2 -0.1
Week of 12/19100.0*Average seed
Internacional 2 Parana 1 -0.4
Corinthians 5 Figueirense 2 +0.1
Points
Chance Will Win Championship