Focal length designation

  • Hi All,
    Here is a question for those in the know:
    I am used to seeing a single number for focal length in the EXIF data such as:
    Focal Length: 39.1 mm.
    But I am confused by
    Focal Length: 468/100 mm.
    Am I to take it as 4.68 mm? Any thoughts?
    Thnx,
    MT