As I was studying to take a trigonometry test so I can take Calculus this semester for fun (crazy, huh?), I found this site. It is a quick run through of the imaginary (complex) number rules.
What I found helpful was the practice problems. The answers are hidden until you pass the mouse over them and then they appear. Quick, easy problems that allow a student to reassure themselves that they get it.
This site also offers iPhone and Adroid apps.
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