How are these numbers calculated?

Big Games

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

Week of 7/1100.0*Super 8100.0*League 1 Shield100.0*Average seed
Workington 46 London 16 +21.2
-21.2
+1.2
Barrow 36 All Golds 6 +3.9
-3.9
+0.2
Hunslet 56 Coventry 24 -3.2
+3.2
-0.1
Whitehaven 28 Keighley 22 +2.7
-2.7
+0.1
Oxford 20 North Wales 52 -1.1
+1.1
-0.0
Doncaster 34 Oxford 16 -1.0
+1.0
-0.2
Doncaster 10 Newcastle 20 -0.7
+0.7
-0.0
Toronto 64 York 22 +0.3
-0.3
+0.1
Week of 7/8100.0*Super 8100.0*League 1 Shield100.0*Average seed
Workington 30 Keighley 30 +12.5
-12.5
-0.1
London 30 Hunslet 16 +3.4
-3.4
+0.2
Toronto 62 All Golds 10 +2.5
-2.5
+0.1
York 68 Hemel 6 -0.3
+0.3
-0.1
North Wales 12 Whitehaven 12 +0.1
-0.1
+0.0
South Wales 12 Doncaster 70 -0.1
+0.1
-0.2
Newcastle 68 Coventry 20 -0.1
+0.1
-0.2
Week of 7/15100.0*Super 8100.0*League 1 Shield100.0*Average seed
York 34 Workington 0 -5.3
+5.3
-0.4
Keighley 92 Oxford 6 -5.3
+5.3
-0.2
Coventry 13 North Wales 36 -5.3
+5.3
-0.1
Games Above .500
Chance Will Win Championship