How are these numbers calculated?

Big Games

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

Week of 11/23100.0*Chance wins title100.0*Promoted100.0*Average seed
Vitoria 4 Gremio 2 +16.4
+0.2
Vasco da Gama 1 Sao Paulo 2 +14.3
Yes
+0.2
Cruzeiro 3 Flamengo 2 +1.2
+0.0
Palmeiras 2 Ipatinga 0 -0.1
Week of 11/30100.0*Chance wins title100.0*Promoted100.0*Average seed
Ipatinga 1 Gremio 4 -3.9
Sao Paulo 1 Fluminense 1 -1.8
-0.0
Week of 12/7100.0*Chance wins title100.0*Promoted100.0*Average seed
Gremio 2 Atletico-MG 0 -13.1
-0.1
Goias 0 Sao Paulo 1 Yes
+0.1
Points
Chance Will Win Championship