Here some exercises to practice the ordinals.
http://www.ngfl-cymru.org.uk/vtc/ordinal_numbers/eng/Introduct/starteractivity.htm
http://www.harcourtschool.com/activity/ordinal_number_matchup/
http://www.ngfl-cymru.org.uk/vtc/ordinal_numbers/eng/Introduct/mainsession1.htm
http://www.ngfl-cymru.org.uk/vtc/ordinal_numbers/eng/Introduct/mainsession2.htm
http://www.ngfl-cymru.org.uk/vtc/ordinal_numbers/eng/Introduct/plenary.htm
http://www.janbrett.com/piggybacks/ordinal.htm
http://www.studyzone.org/testprep/math4/a/ordinalp2.cfm