Online Practice (Math Games)

Racing Motorcycles
http://www.mathnook.com/math/bike-racing-math-integer.html

Integer Jeopardy
http://www.math-play.com/Integers-Jeopardy/Integers-Jeopardy.html

Lots of Different Games here
http://www.mathnook.com/math/skill/integergames.php

Integer Football
http://www.mathgoodies.com/games/integer_game/football.html