Helpful videos and practice sheets:
Adding Integers using a number line
http://www.youtube.com/watch?v=204uFu0DRWE
Subtracting Integers
http://www.youtube.com/watch?v=CWynE4T4-5w
Using the "Integer Triangle Face" and Integer Chips to Solve problems
http://www.youtube.com/watch?v=2F0sjv9aSNU&safety_mode=true&persist_safety_mode=1&safe=active
Using a Number Line to Multiply Integers
http://www.youtube.com/watch?v=K_Jqdw3NpEw&safety_mode=true&persist_safety_mode=1&safe=active
Using a Number Line to Divide Integers
http://www.youtube.com/watch?v=hnO8_oQHDCA&safety_mode=true&persist_safety_mode=1&safe=active