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Operations with Imaginary Numbers

Subject Area: Mathematics (B.E.S.T.) | Grade Level: 11
Lesson Length: 1 hour
Keywords/Tags: Standards: AA.FGR.5.2; AA.FGR.5.3
Lesson Description: After this lesson, students will be able to perform the operations of addition, subtraction, and multiplication on imaginary(complex) numbers.

Other AA.FGR.5.2; AA.FGR.5.3

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Video : Operations with Complex Numbers

Instructions: Please watch the following video as many times as needed before starting to go through other lesson pages. Understanding the content of the video is very important since the lesson activities will be all about this video content.Please watch the following video as many times as needed before starting to go through other lesson pages. Understanding the content of the video is very important since the lesson activities will be all about this video content.")

Description: Learn how to perform operations with imaginary(complex) numbers with this video!

Quiz : Operations with Imaginary Numbers Quiz

Instructions: Please complete this quiz by choosing the correct answer for each question. You can take this quiz as many times needed.

Question #1

(4+2i) - (5-3i)

A) 9-i

B) -1-i

C) 9+5i

D) -1+5i

Question #2

(7-4i) + (8-4i)

A) 15

B) 7i

C) 15-8i

D) 15+8i

Question #3

(2+4i) - (5+4i)

A) -3

B) -2

C) -7

D) -7-8i

Question #4

(-7+7i)-2-(2i)

A) -9+5i

B) 9+9i

C) 9-9i

D) -11+5i

Question #5

(-4i)+(-2+5i)-(7-3i)

A) -9+4i

B) -8+4i

C) 5+4i

D) 9-12i

Question #6

(3i)(-7+3i)

A) 9-21i

B) 9+21i

C) 9-27i

D) 9+21i

Question #7

(-5i)(-5i)(-5i)

A) -125i

B) 216

C) 343

D) 125i

Question #8

(-2i)(4i)(6-7i)

A) -48+56i

B) -24

C) 48-56i

D) -48-56i

Question #9

8(-8i)(-2+3i)

A) -192-128i

B) 192-128i

C) 192+128i

D) -192+128i

Question #10

(-4+4i)(-6-i)(6-i)

A) -188-92i

B) 148-148i

C) 188+92i

D) -148+148i

Description: Students will add, subtract, and multiply imaginary numbers in order to find the correct solution.

Resources : Operations with Imaginary Numbers Practice

Instructions: Please see additional external resources below. Feel free visit each link to learn more about this lesson.

Operations with Imaginary Numbers Worksheet

Adding Subtracting IXL Practice
Link to practice problems on IXL for adding and subtracting.

Multiplying and Dividing IXL Practice
Here is the link to additional practice problems for multiplying imaginary numbers.

Khan Academy Adding and Subtracting Support
Here is a link to khan academy where they are additional instructional videos and practice problems.

Khan Academy Multiplying Support
Here is the link to Khan Academy with additional instructional videos and practice problems.

Description: Here are links with additional practice problems over operations with imaginary numbers.