How are these numbers calculated?

Big Games

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

Week of 11/13100.0*Average seed
ABC 3 Mogi Mirim 1 +0.1
Week of 11/20100.0*Average seed
Macae 1 Boa Esporte 1 +0.1
ABC 1 Botafogo 2 -0.0
Week of 11/27None
Chance Will Win Championship