It's not entirely clear what you mean by the (+1) references. However, assuming you're wanting to increase the zoom in 1% increments, try:
Code:
Sub Formatting()
Application.ScreenUpdating = False
With ActiveSheet.PageSetup
.Orientation = xlLandscape
.PaperSize = xlPaperLetter
.Zoom = False
.FitToPagesWide = 1
.FitToPagesTall = False
If .Zoom < 40 Then .Zoom = .Zoom + 1
If .Zoom < 40 Then .Zoom = .Zoom + 1
End With
Application.ScreenUpdating = True
End Sub