How are these numbers calculated?

Big Games

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

Sunday, 7/5100.0*Chance in playoffs100.0*Round of 4100.0*Average seed
Tahiti 2 Vanuatu 1 -36.8
-36.8
-1.2
Monday, 7/6100.0*Chance in playoffs100.0*Round of 4100.0*Average seed
Vanuatu 46 Micronesia 0 +12.8
+12.8
+1.2
Solomon Islands 1 Papua New Guinea 2 +0.0
Tuesday, 7/7100.0*Chance in playoffs100.0*Round of 4100.0*Average seed
Tahiti 0 Fiji 0 Out
No
-0.4
Points
Chance Will Make Playoffs