Copy
  To copy a number from Calculator's accumulator or memory
  to another application, choose Copy from the Edit menu as
  follows:
  1.  To highlight the number, click on either the accumulator
      or memory.
  2.  To copy the highlighted number, choose Copy.  You can
      then paste the number in another application's window.
  Additional topics:
  *   Edit Menu
  *   File Menu
  *   Mode Menu
  *   Overview of Calculator