How are these numbers calculated?

Big Games

How we did yesterday and who we should root for today.   Explain

Friday100.0*Chance wins title
Staples 54 Bassick 32 -0.9
Norwalk 48 Ridgefield 60 +0.4
Saturday100.0*Chance wins title
Staples 37 Ridgefield 40 Yes
MondayNone
Games Above .500
Chance Will Win Championship