I suppose like this:

VB Code:
  1. Private Sub Command1_Click()
  2.  
  3.     Dim Num As Long
  4.     Dim Denom As Long
  5.    
  6.     DecToFrac 0.125, Num, Denom
  7.    
  8.     Text1.Text = Num & "/" & Denom
  9. End Sub