How are these numbers calculated?

Big Games

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

Week of 10/10100.0*Chance in playoffs100.0*Average seed
Real Salt Lake 0 Portland 1 +0.3
-0.1
FC Dallas 2 Vancouver 0 +0.1
Week of 10/16100.0*Chance in playoffs100.0*Average seed
Earthquakes 1 Sporting KC 0 -6.9
+0.0
Sporting KC 0 Rapids 2 +6.1
+0.3
Galaxy 2 Portland 5 -3.9
-0.2
Dynamo 1 Seattle 1 +1.0
-0.3
Week of 10/25100.0*Chance in playoffs100.0*Average seed
FC Dallas 2 Earthquakes 1 In
+0.2
Seattle 3 Real Salt Lake 1 In
+1.6
Sporting KC 2 Galaxy 1 -11.1
-0.1
Portland 4 Rapids 1 -0.2
Vancouver 3 Dynamo 0 -0.2
Points
Chance Will Make Playoffs