How are these numbers calculated?

Big Games

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

Week of 3/11100.0*Seletiva100.0*Average seed
Botafogo 2 Madureira 1 -3.1
Boavista 0 Fluminense 3 -1.9
+0.1
Week of 3/19100.0*Seletiva100.0*Average seed
Bangu 2 Americano 0 +24.7
-0.6
Madureira 0 Flamengo 2 -13.3
+0.2
Botafogo 4 Portuguesa 1 -4.3
+0.2
Week of 3/23100.0*Seletiva100.0*Average seed
Americano 2 Botafogo 2 +11.0
+0.0
Madureira 0 Cabofriense 0 -10.5
+0.1
Portuguesa 2 Resende 1 -0.2
Points
Chance Will Make Playoffs