You could use this macro to add the ROUND function to formulas in place.

Sub RoundAdd()
Dim myStr As String
Dim cel As Range
   For Each cel In Selection
       If cel.HasFormula = True Then
           If Not cel.Formula Like "=ROUND(*" Then
               myStr = Right(cel.Formula, Len(cel.Formula) - 1)
               cel.Value = "=ROUND(" & myStr & ",2)"
           End If
       End If
   Next
End Sub

Gord Dibben  MS Excel MVP