How are these numbers calculated?

Big Games

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

Week of 11/15100.0*Serie B100.0*Average seed
Sport Recife 1 Botafogo-SP 2 -21.8
+1.2
Botafogo-SP 2 Vitoria 0 -11.4
+0.9
Flamengo 1 Internacional 0 +4.3
-0.3
America-MG 1 Bahia 2 -2.3
+0.1
Gama 4 Atletico-PR 1 +2.2
-0.1
Coritiba 1 Santa Cruz 0 -2.2
+0.1
Sao Paulo 3 Flamengo 1 -0.7
+0.1
Santa Cruz 2 America-MG 1 -0.6
-0.1
Portuguesa 1 Cruzeiro 3 +0.5
Ponte Preta 1 Juventude 0 -0.4
Bahia 2 Gama 1 -0.4
Botafogo 2 Corinthians 4 -0.2
Week of 11/24100.0*Serie B100.0*Average seed
Portuguesa 2 Botafogo 1 +0.0
Week of 12/1100.0*Serie B100.0*Average seed
Flamengo 2 Palmeiras 0 Yes
-0.2
Gama 5 Botafogo-SP 0 Yes
-0.6
Guarani 1 Santa Cruz 2 -0.5
America-MG 1 Juventude 1 -0.1
Points
Chance Will Make Playoffs