# Complex Numbers Teacher Resources

Find Complex Numbers lesson plans and worksheets
Showing 257 resources
Lesson Plan
EngageNY

#### Complex Numbers as Vectors

For Teachers 11th - 12th Standards
Show your math class how to use vectors in adding complex numbers. Vectors represent complex numbers as opposed to points in the coordinate plane. The class uses the geometric representation to add and subtract complex numbers and...
Handout
Thomson Brooks-Core

#### Complex Numbers

For Students 10th - 12th
A straightforward approach to teaching complex numbers, this lesson addresses the concepts of complex numbers, polar coordinates, Euler's formula, De moivres Theorem, and more. It includes a practice problems set with odd answers and a...
Lesson Plan
EngageNY

#### An Appearance of Complex Numbers 1

For Teachers 11th - 12th Standards
Complex solutions are not always simple to find. In the fourth lesson plan of the unit, the class extends their understanding of complex numbers in order to solve and check the solutions to a rational equation presented in the first...
Activity
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Illustrative Mathematics

#### Computations with Complex Numbers

For Teachers 9th - 12th Standards
This quick set of problems provides a brief refresher on the arithmetic of complex numbers. Learners need to multiply, add and subtract, and remember features of i when raised to a power. Included solutions are clear enough that learners...
Instructional Video4:07
Curated OER

#### How Do You Add Complex Numbers by Graphing in the Complex Plane?

For Teachers 10th - 11th
Graphs usually add an extra dimension to ones understanding of mathematical concepts and graphing complex numbers is no exception. This video shows to graph complex numbers on the complex plane and what the results of adding complex...
Instructional Video5:05
Curated OER

#### How Do You Graph Complex Numbers?

For Teachers 10th - 11th
Complex numbers have two parts and can be graphed on a complex plane. After an explanation of the complex plane, this video shows three examples of graphing complex numbers.
Instructional Video2:45
Curated OER

#### How Do You Multiply Complex Numbers Using FOIL?

For Teachers 10th - 11th
How do you multiply complex numbers? The instructor in this video uses the FOIL method of multiplying binomials to multiply two complex numbers. She finishes the problem, by using prior knowledge of the definition of the imaginary unit,...
Instructional Video16:11
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2
Flipped Math

#### Complex Numbers

For Students 9th - 12th Standards
Simplify the complex with a thorough video lesson. Individuals view a lesson on complex numbers and then use a provided set of practice problems to show what they've learned. The lesson includes instruction on using the four basic...
Instructional Video8:04
Curated OER

#### Complex Conjugates

For Students 10th - 12th
Sal discusses the usefulness of the conjugate of the complex number is this video. First, he shows both graphically and algebraically adding a complex number and its conjugate. Then, he shows how to simplify a rational expression with...
Worksheet
Curated OER

#### Complex Numbers

For Students 10th - 12th
In this complex numbers instructional activity, learners write numbers in standard form.  They identify real, imaginary and complex numbers.  Students find the absolute value and conjugate of a number.  This two-page instructional...
Lesson Plan
EngageNY

#### Complex Number Division 1

For Teachers 11th - 12th Standards
Conjugating in the math classroom — and we're not talking verbs! The seventh lesson in a series of 32 introduces the class to the building blocks of complex number division. During the instruction, the class learns to find the...
Worksheet
Math eBook

For Students 10th - 12th Standards
In this complex numbers activity, learners find the sum of complex numbers. This four-page activity contains approximately 20 multi-step problems.
Worksheet
Curated OER

#### Complex Numbers

For Students 9th - 12th
In this algebra worksheet, students simplify complex numbers ranging from performing basic operations to distribution with a few combine like terms. There are 44 questions.
Lesson Plan
Curated OER

#### Complex Numbers

For Teachers 9th - 12th Standards
Students examine complex numbers. In this Algebra II lesson, students investigate two programs that involve complex numbers: the MANDELER Program and SYNDIV program.
Worksheet
Curated OER

#### Complex Numbers

For Students 10th - 11th
In this algebra worksheet, students solve complex numbers using multiplication and division properties. There are 10 questions with an answer key.
Worksheet
Curated OER

#### Complex Numbers

For Students 10th - 11th
In this algebra worksheet, students solve complex numbers using multiplication and division properties. There are 10 questions with an answer key.
Worksheet
Curated OER

#### Complex Numbers

For Students 11th
In this algebra worksheet, 11th graders solve complex numbers using division. multiplication, addition and subtraction. There are 11 questions with an answer key.
Instructional Video3:38
Welch Labs

#### Imaginary Numbers Are Real (Part 6: The Complex Plane)

For Students 9th - 12th Standards
How do addition and subtraction work on the complex plane? A short video presentation provides a clue on how to add complex numbers geometrically. The video ends with four problems to determine the rules for multiplication on the complex...
Instructional Video2:57
Welch Labs

#### Imaginary Numbers Are Real (Part 4: Bombelli's Solution)

For Students 9th - 12th Standards
Is the square root of negative one crucial to the process of finding other solutions? Using the properties of the newly discovered square root of negative one, historical mathematician Bobelli is able to solve Cardan's problem. His...
Lesson Plan
Ohio Department of Education

#### The Solution is Complex

For Teachers 9th - 12th Standards
Consider complex numbers, roots, and quadratic equations. Use the discriminate as a way to determine the nature of a quadratic's roots. Then discuss the similarities and differences between quadratics with two, one, or no real roots....
Instructional Video12:58
Curated OER

#### Complex Determinant Example

For Students 10th - 12th
Sal solves a complex determinant problem from the 2010 IIT entrance test. Knowledge of determinants, the exponential form of complex numbers, trigonometric ratios, and algebraic thinking are all utilized here.
Lesson Plan
EngageNY

#### Complex Number Division 2

For Teachers 11th - 12th Standards
Individuals learn to divide and conquer complex numbers with a little help from moduli and conjugates. In the second instructional activity on complex number division, the class takes a closer look at the numerator and denominator of the...
Lesson Plan
EngageNY

#### The Geometric Effect of Some Complex Arithmetic 1

For Teachers 11th - 12th Standards
Translating complex numbers is as simple as adding 1, 2, 3. In the ninth lesson plan in a 32-part series, the class takes a deeper look at the geometric effect of adding and subtracting complex numbers. The resource leads pupils into...
Lesson Plan
EngageNY

#### The Geometric Effect of Some Complex Arithmetic 2

For Teachers 11th - 12th Standards
The 10th lesson in a series of 32, continues with the geometry of arithmetic of complex numbers focusing on multiplication. Class members find the effects of multiplying a complex number by a real number, an imaginary number, and another...