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Khan Academy

Khan Academy: Complex Numbers From Absolute Value & Angle

For Students 9th - 10th Standards
Given the absolute value and the angle of a complex number, express the number in the form a+bi. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
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.
Activity
Interactive Mathematics

Interactive Mathematics: Exponential Form of a Complex Number

For Students 9th - 10th Standards
Several examples are presented to demonstrate how to write complex numbers in exponential for. The demonstrations concludes with a comparison of different forms complex numbers: rectangular, exponential, and polar.
Lesson Plan
Other

West Contra Costa Usd: Volume: A Foundation in Unit Cubes [Pdf]

For Teachers 4th - 6th Standards
A very detailed lesson on determining the volume of rectangular prisms, teaching students how to derive the formula for volume, and to use it successfully. Plenty of examples, student work, and assessment options.
Unit Plan
CK-12 Foundation

Ck 12: Polar Form of a Complex Number

For Students 11th - 12th Standards
[Free Registration/Login may be required to access all resource tools.] Here you will learn how to convert complex numbers from rectangular form to polar form. You will also explore the graphs of complex numbers on a polar graph.
Graphic
Curated OER

Eternal Egypt: Rectangular Comb for Weaving

For Students 9th - 10th
The rectangular comb is decorated with five central circles, each of which is composed of three raised circles. There are nine wide teeth on one side of the comb and approximately 35 whole teeth on the other side.
Unit Plan
Texas A&M University

Wtamu Virtual Math Lab: Intermediate Algebra

For Students 9th - 10th
This site is a tutorial for students in algebra 2 or for those who need a refresher. The site has explanations, definitions, examples, practice problems and practice tests are found covering topics such as linear equations, graphing,...
Activity
Texas Instruments

Texas Instruments: Drawing on Your Knowledge

For Teachers 6th - 8th Standards
In this activity, students will understand the basic geometric concepts of parallelism and perpendicularity, and will also able to use rectangular coordinates to make congruent objects. They will display understanding of parts of...
Activity
Ministry of Education and Universities of the Region of Murcia (Spain)

Ministerio De Educacion Y Ciencia: De Los Numeros Naturales a Los Complejos

For Students 9th - 10th Standards
This interactive unit will expand your knowledge from natural to complex numbers. Learn how to express a complex number in polar form, move from rectangular form to polar form and vice versa, operate with complex in polar form and...
Unit Plan
CK-12 Foundation

Ck 12: Elem Math: Partitioning Composite Figures Into Rectangles to Find Area 1

For Students 3rd - 5th Standards
[Free Registration/Login may be required to access all resource tools.] In this learning module, students are asked to partition a shape into rectangles and add their areas together to get the area of the whole figure. Includes video...
Interactive
National Council of Teachers of Mathematics

Nctm: Illuminations: Factorize

For Students 3rd - 8th
With this activity, you can visually explore the concept of factors by creating rectangular arrays. The length and width of the array are factors of your number.
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...
Unit Plan
CK-12 Foundation

Ck 12: Analysis: Product and Quotient Theorems

For Students 11th - 12th
[Free Registration/Login may be required to access all resource tools.] Multiplying and dividing complex numbers in polar form, checking with rectangular form and technology
Unit Plan
PBS

Pbs: Modeling Fraction and Mixed Number Division Using Arrays

For Students 3rd - 5th Standards
This video illustrates how to use an array as a visual model for solving a word problem involving the division of fractions and mixed numbers. The problem asks students to determine the width of a rectangular fennec fox den based on its...
Activity
PBS

Pbs Teachers: Scientific American: Deep Crisis: Salmon Counting

For Teachers 3rd - 8th Standards
In this lesson, students can explore the techniques of census and population counting by inferring numbers of a virtual population illustrated within a rectangular sampling grid, and observing the accuracy of the technique in relation to...
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Illustrative Mathematics

Illustrative Mathematics: 5.md Cari's Aquarium

For Teachers 4th - 6th Standards
This task supports the standard 5.MD.5.b in that it asks students to use the volume formula and conceptual understanding to solve real-world problems.
Lesson Plan
Alabama Learning Exchange

Alex: What's Your Question? Multiplication Word Problems

For Teachers 3rd - 5th Standards
Students will explore multiplication and word problems. They will work cooperatively to examine a story scenario, list possible questions to develop a completed word problem and solve it using a variety of strategies. The students will...