How are these numbers calculated?

Big Games

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

Week of 10/11100.0*Average seed
Wales 1 Macedonia 0 +6.0
Scotland 2 Croatia 0 -3.3
Belgium 1 Wales 1 +1.1
Serbia 5 Macedonia 1 +0.6
Montenegro 2 Moldova 5 -0.3
Azerbaijan 1 Russia 1 -0.2
Latvia 2 Slovakia 2 +0.1
Iceland 2 Cyprus 0 +0.1
Malta 1 Czech Republic 4 +0.0
Luxembourg 0 Russia 4 +0.0
Israel 1 Northern Ireland 1 +0.0
Points
Chance Will Make Playoffs