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Khan Academy

Khan Academy: Powers of the Imaginary Unit

For Students 9th - 10th Standards
Simplify expressions with base i (the imaginary unit) raised to a positive exponent.
Unit Plan
Khan Academy

Khan Academy: Powers of Complex Numbers

For Students 9th - 10th Standards
Simplify a power of a complex number z^n, or solve an equation of the form z^n=k. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
Handout
Windstream

Ojk's Precalculus Study Page: Complex Numbers

For Students 9th - 10th Standards
A brief explanation of complex numbers.
Handout
University of Toronto (Canada)

The Origin of Complex Numbers and the Notation "I"

For Students 9th - 10th Standards
Contains a brief summary on the origin of complex numbers.
Handout
Interactive Mathematics

Interactive Mathematics: Graphical Representation of Complex Numbers

For Students 9th - 10th Standards
A description of the complex plane is given with examples of how to plot complex numbers. Also included is an explanation of how to add complex numbers graphically.
Activity
Oswego City School District

Regents Exam Prep Center: Cyclic Nature of the Powers of "I"

For Students 9th - 10th
Students learn two easy methods to simplify "i" with any exponent. The practice page has several problems that include explanations. The teacher resource page has two possible activities for helping students understand the concept.
Unit Plan
CK-12 Foundation

Ck 12: Quadratic Formula and Complex Sums

For Students 9th - 10th Standards
[Free Registration/Login may be required to access all resource tools.] Represent complex numbers on the complex plane in rectangular and polar form (including real and imaginary numbers), and explain why the rectangular and polar forms...
Handout
Math Open Reference

Math Open Reference: Number

For Students 9th - 10th
Resource defines numbers into two main categories, counting numbers and scalars. It also gives examples of number notation.
Handout
Wolfram Research

Wolfram Math World: Square Root

For Students 9th - 10th Standards
This math site from Mathworld.com explains what a square root is including information on imaginary numbers and many links. This site also addresses the continued fractions of positive real square roots, in particular the square root of...
Unit Plan
TED Talks

Ted: Ted Ed: Math Jokes Explained

For Students 9th - 10th
It's not your typical knock-knock joke- these funny jests will tickle your imaginary numbers and teach you a thing or two about mathematics. [4:04]
Handout
Math Open Reference

Math Open Reference: Real Number

For Students 9th - 10th Standards
Learn about real numbers with this helpful reference tool. Provides a detailed definition and an interactive activity that enhances further explanation. Includes links to related topics.
eBook
CK-12 Foundation

Ck 12: Algebra Ii: 1.6 the Complex Plane

For Students 9th - 10th Standards
This section includes operations with imaginary and complex numbers and plotting numbers on the complex plane.
Activity
Math Medics

S.o.s. Math: The Complex Plane

For Students 9th - 10th Standards
Contains a lesson and practice exercises about complex numbers in a complex plane.
Unit Plan
Cut the Knot

Cut the Knot!: Napoleon's Theorem

For Students 9th - 10th
Site that describes in detail Napoleon's theorem. To understand this site be sure you understand what the centroid of an object is. The site describes polygons in terms of the roots of unity of a function. The page gives an interactive...
Graphic
Other

The Complex Plane Examples

For Students 9th - 10th Standards
An advanced look into the complex plane, with detailed examples.
Graphic
Stanford University

The Complex Plane (Standford University)

For Students 9th - 10th Standards
Contains both general and detailed information about the complex plane.
Handout
Math Words

Math words.com: Complex Plane

For Students 9th - 10th Standards
Contains the definition and a picture for what a complex plane is.
Lesson Plan
PBS

Pbs Learning Media: Math + Arts: Jack & the Zero Clan

For Teachers K - 1st Standards
In this lesson, students will create and solve a word problem related to adding and subtracting within 1,000, develop a script for a short scene using dialect, and perform it using the elements of performance, specifically acting,...
Unit Plan
CK-12 Foundation

Ck 12: Analysis: Increasing and Decreasing Functions

For Students 9th - 10th
[Free Registration/Login may be required to access all resource tools.] Identification of increasing and decreasing intervals of discrete and non-discrete functions. Students examine guided notes, review guided practice, watch...

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