Activity
Ministry of Education and Universities of the Region of Murcia (Spain)

Ministerio De Educacion Y Ciencia: Numeros Complejos

For Students 9th - 10th Standards
In Spanish. In this unit you will be able to practice interactively the concept of complex numbers in binomial and polar forms.
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.
Graphic
Windstream

Ojk's Precalculus Study Page: Polar Coordinates and Complex Numbers

For Students 9th - 10th Standards
An introduction to basic conversion formulas for polar coordinates and complex numbers. Includes several examples.
Handout
Johan Claeys

Polar Form of Complex Numbers

For Students 9th - 10th Standards
Contains a brief explanation of polar forms of complex numbers.
Handout
Math Warehouse

Math Warehouse: Complex and Imaginary Numbers

For Students 9th - 10th Standards
Features numerous exercises relating to complex and imaginary numbers. Includes video tutorials, calculators, worksheets and more.
eBook
Mathigon

Mathigon: Real, Irrational, Imaginary Numbers

For Students 9th - 10th Standards
Explore this course in imaginary and complex numbers including topics of integers, real numbers, infinity, transcendental numbers, imaginary and complex numbers.
Unit Plan
CK-12 Foundation

Ck 12: Imaginary Numbers

For Students 9th - 10th Standards
[Free Registration/Login may be required to access all resource tools.] Know there is a complex number i such that i squared = -1, and every complex number has the form a + bi with a and b real.
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.] Know there is a complex number i such that i squared = -1, and every complex number has the form a + bi with a and b real.
Handout
Wolfram Research

Wolfram Math World: Complex Plane

For Students 9th - 10th Standards
This math site gives a visual representation of a complex plane with several values plotted, the site explains that any complex number can be plotted on such a plane. The site contains links to related words and topics.
Lesson Plan
Alabama Learning Exchange

Alex: Classifying Complex Numbers

For Teachers 9th - 10th Standards
This lesson helps students distinguish between strictly complex numbers, strictly real numbers and strictly imaginary numbers while learning that real numbers and imaginary numbers are subsets of the set of complex numbers.
Unknown Type
Khan Academy

Khan Academy: Complex Number Conjugates

For Students 9th - 10th Standards
Given a complex number, find its conjugate or plot it in the complex plane. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
Handout
Northern Illinois University

Northern Illinois University: Roots Unique Factorization

For Students 9th - 10th
This site from the Northern Illinois University contains relevant information about complex nth roots of unity. Includes important formulas.
Handout
Wolfram Research

Wolfram Math World: Complex Conjugate

For Students 9th - 10th Standards
This site contains an explanation of complex conjugates. Then it goes on to list and display charts and formulas. Links are also provided for additional information.
Graphic
Other

The Complex Plane Examples

For Students 9th - 10th Standards
An advanced look into the complex plane, with detailed examples.
Activity
Math Medics

S.o.s. Math: The Polar Form of a Complex Number

For Students 9th - 10th Standards
This lesson from S.O.S. Math provides great information on the polar form of a complex numbers. It has many formulas and examples, and it also discusses the polar coordinates as well. Links are provided for additional subjects.
Unit Plan
Khan Academy

Khan Academy: Simplify Roots of Negative Numbers

For Students 9th - 10th Standards
Rewrite square roots of negative numbers as imaginary numbers. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
Activity
Interactive Mathematics

Interactive Mathematics: De Moivre's Theorem

For Students 9th - 10th Standards
Using DeMoivre's Theorem, the powers and roots of complex numbers are simplified. Several examples are given, including interactive exercises.
Unit Plan
CK-12 Foundation

Ck 12: Plot Polar Coordinates

For Students 11th - 12th Standards
[Free Registration/Login may be required to access all resource tools.] Here you will learn how to convert and graph complex numbers in trigonometric or polar form using the polar coordinate system, which is similar in some ways to (x,...
Handout
Cut the Knot

Cut the Knot!: What Is a Number?

For Students 9th - 10th Standards
Casual and clear but definitely upper-level discussion of rational, real, imaginary, and several other types of numbers. Links to related sites.
Handout
Grammarly

Grammarly Blog: When Should I Spell Out Numbers?

For Students 9th - 10th Standards
This page focuses on when to write figures and numbers in writing; it provides the rules for both general writing and for technical, scientific, and complex writing. Examples are provided.
Unit Plan
CK-12 Foundation

Ck 12: Analysis: Quadratic Formula and Complex Sums

For Students 11th - 12th Standards
[Free Registration/Login may be required to access all resource tools.] In this lesson students identify complex roots of quadratic functions with the quadratic formula, and adding and subtracting complex numbers. Students examine guided...
Graphic
Stanford University

The Complex Plane (Standford University)

For Students 9th - 10th Standards
Contains both general and detailed information about the complex plane.
Activity
Varsity Tutors

Varsity Tutors: Hotmath: Practice Problems: Polar Coordinates

For Students 9th - 10th Standards
Hotmath provides 20 practice problems relating to polar coordinates and complex numbers. Each of the practice problems include a step-by-step guide for solving.
Lesson Plan
Shodor Education Foundation

Shodor Interactivate: Lesson: The Mandelbrot Set

For Teachers 9th - 10th
In this instructional activity students will explore Julia sets and the Mandelbrot set. In the process they will learn about fractals and explore complex numbers and function iteration.

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