How are these numbers calculated?

Big Games

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

Week of 3/18100.0*Chance in playoffs100.0*Average seed
Portuguesa 2 Macae 1 +0.1
+0.8
Volta Redonda 3 Madureira 2 -0.1
Resende 0 Flamengo 1 +0.0
Week of 3/22100.0*Chance in playoffs100.0*Average seed
Nova Iguacu 0 Portuguesa 0 -0.1
Boavista 1 Volta Redonda 0 -0.1
Portuguesa 2 Madureira 0 +1.0
Volta Redonda 2 Nova Iguacu 1 -0.1
Flamengo 3 Bangu 0 +0.0
Macae 1 Resende 2 -0.1
Week of 3/29100.0*Chance in playoffs100.0*Average seed
Portuguesa 1 Botafogo 4 -0.5
Boavista 1 Portuguesa 1 -0.3
Botafogo 3 Resende 2 +0.3
Madureira 3 Bangu 1 +0.2
Resende 0 Nova Iguacu 1 +0.2
Bangu 2 Macae 0 -0.2
Vasco da Gama 1 Boavista 0 +0.1
Madureira 2 Fluminense 2 -0.1
Volta Redonda 1 Flamengo 1 -0.1
Points
Chance Will Make Playoffs