The Free On-line Dictionary of Computing (30 December 2018):

numeric keypad

    A keypad that has become a standard feature of
   PC keyboards, consisting of a rectangular array of 17
   extra keys at the right-hand end: 0-9, ., Num Lock, /,
   *, -, + and Enter.  Apart from Num Lock, these
   typically duplicate the function of other keys but are
   designed to make entering basic numerical calculations as
   quick as on a digital calculator.  It is often possible to
   assign completely different functions to these keys according
   to the needs of a particular application.

   (2007-01-31)