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Larson Texts
Larson Precalculus: Operations of Complex Numbers in the Complex Plane [Pdf]
A 3-page handout with examples and exercises in adding, subtracting, and multiplying complex numbers in the complex plane, as well as finding complex conjugates.
Larson Texts
Larson Precalculus: Magnitude of a Scalar Multiple [Pdf]
Example and some exercises on how to find the magnitude of a scalar multiple.