How are these numbers calculated?

Big Games

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

Week of 4/24100.0*Average seed
Crewe 5 Accrington 1 +0.9
Hereford 2 Rochdale 1 -0.3
Accrington 1 Barnet 0 -0.2
Burton 0 Bournemouth 2 +0.1
Cheltenham 1 Aldershot 2 +0.1
Torquay 1 Macclesfield 0 -0.0
Week of 5/8100.0*Average seed
Crewe 0 Bradford 1 -1.0
Hereford 3 Rotherham 0 -0.4
Lincoln City 0 Macclesfield 0 +0.1
Torquay 0 Notts County 0 +0.1
Points
Chance Will Win Championship