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Activity: John and Betty's Journey into Complex Numbers
Go to: http://mathforum.org/johnandbetty/ (opens a new window)
Description: A children's book-on-the-Web from Australia, designed to introduce complex numbers in story form in a way that is intuitive and enjoyable for students. John, Betty, and their dog Trevor solve a series of problems designed to introduce integers, fractions, surds, imaginary numbers, complex numbers, Argand diagram; vectors, multiplication in polar form, relating polar and Cartesian form, De Moivre's theorem; and the Mandelbrot set.
Technology Type: Java Applet 
Author: Matt Bower
Language: English 
Cost: Does not require payment for use

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Tool: Complex Numbers Applet
Courses: Trigonometry Complex Numbers
PreCalculus Properties of Rational Functions