Fill in the blanks to make each of the following a true statement. Also name the property exhibited by each statement.
468 + ____ = 522 + 468
789 * ____ = 789
(43 + 108 ) + 572 = 43 + ( ______ + 572 )
______ + 915 = 915
53 * ( 99 + ____ ) = 53 * 99 + 53