The rounding operation adds 1 to the absolute value of the low-order
  digit of the resultant identifier if the absolute value of the next
  least significant (lower-valued) digit of the intermediate data item
  is greater than or equal to 5.

  If you do not use the ROUNDED phrase, any excess low-order digits in
  the arithmetic result are truncated when the result is moved to the
  resultant identifier(s).