How are these numbers calculated?

Big Games

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

Week of 11/20100.0*Average seed
Sport Recife 2 Ponte Preta 1 +0.0
Brasil de Pelotas 2 Atletico-GO 2 +0.0
Week of 11/24None
Week of 11/29100.0*Average seed
Figueirense 1 Operario-PR 1 +0.4
Parana 3 Botafogo-SP 3 -0.1
Chance Will Win Championship