Amby Duncan-Carr
Amby: Integers: Operations With Signed Numbers
Amby's Resources offers a tutorial on integers: operations with signed numbers. There are sample problems as well as problems for you to try.
Varsity Tutors
Varsity Tutors: Hotmath: Algebra Review: Multiply and Divide With Negatives
Find a quick, concise explanation of how to multiply and divide with negative numbers. An example is given and clearly explained for each.