These notes and examples provide an introduction to complex numbers and cover the content of the common core standard N-CN for High Schools. There is a printable booklet that can be issued to students, with spaces for them to fill in the solutions to the examples. Full solutions to the examples are provided for the teacher in a separate document. The notes are also suitable for self-study. You will receive the original Word document as well as the pdf so you can edit it as you wish.