Order of Operations
Great video that explains it all!
Study Jams: http://studyjams.scholastic.com/studyjams/jams/math/algebra/aorder-of-operations.htm
http://studyjams.scholastic.com/studyjams/jams/math/numbers/integers.htm
Games:
http://www.math-play.com/Order-of-Operations-Millionaire/division-millionaire.html
http://mrnussbaum.com/orderops/
http://cemc2.math.uwaterloo.ca/mathfrog/english/kidz/order.shtml
http://www.quia.com/rr/318099.html
Integers:
http://www.math-play.com/integers-game.html
http://www.funbrain.com/linejump/
http://www.free-training-tutorial.com/negative-numbers/speedboat.html