How are these numbers calculated?

Big Games

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

Week of 5/7100.0*Average seed
Rio Ave 0 Benfica 1 +0.1
Marítimo 1 Porto 1 +0.0
Week of 5/14100.0*Average seed
Chaves 2 Rio Ave 2 +0.1
Sporting Braga 4 Nacional 0 -0.1
Marítimo 1 Estoril 1 -0.0
Week of 5/21100.0*Average seed
Rio Ave 2 Belenenses 0 -0.1
Paços de Ferreira 0 Marítimo 0 +0.1
Points
Chance Will Win Championship