Activity
Varsity Tutors

Varsity Tutors: Hotmath: Matrix Multiplication

For Students 9th - 10th Standards
A large set of problems present a variety of practice with matrix multiplication. They are given with each step to the solution cleverly revealed one at a time. You can work each step of the problem then click the "View Solution" button...
Activity
Interactive Mathematics

Interactive Mathematics: Matrices

For Students 9th - 10th Standards
This over view of matrices begins with an application to electronics using circuit equations. Examples are provided to demonstrate types of matrices, the identity matrix, addition and scalar multiplication of matrices.
Unit Plan
OnlineMathLearning.com

Online Math Learning: Multiply a Vector by a Matrix

For Students 9th - 10th Standards
Examples, solutions, videos, and lessons to help students learn how to multiply a vector (regarded as a matrix with one column) by a matrix of suitable dimensions to produce another vector. Work with matrices as transformations of...
Handout
Cool Math

Coolmath: Inverse Matrices

For Students 9th - 10th Standards
You can add and subtract matrices, multiply a matrix by a scalar, and multiply two matrices. So, what about division? Well, there isn't a division process for matrices. See this example for how to get around this problem!
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Khan Academy

Khan Academy: Use Matrices to Transform 3 D and 4 D Vectors

For Students 9th - 10th Standards
Find the result (both algebraically and graphically) of transforming a vector using a transformation matrix. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
Unit Plan
CK-12 Foundation

Ck 12: Algebra: Limitations of Matrix Multiplication

For Students 10th - 12th Standards
[Free Registration/Login may be required to access all resource tools.] This lesson shows you how to determine if two matrices can be multiplied together and explains that the commutative property does not apply.
Activity
Ministerio de Educacion, Cultura y Deporte (Spain)

Cnice: Algebra Matricial

For Students 9th - 10th Standards
Presented in Spanish. Example problems and explanations of matrices and subtopics such as adding, subtracting, and multiplying matrices, and inverse matrices. Does provide some solutions.
Unit Plan
CK-12 Foundation

Ck 12: Algebra: Solving Systems by Multiplying One Equation

For Students 10th - 12th Standards
[Free Registration/Login may be required to access all resource tools.] This lesson covers solving systems by multiplying one equation by a constant to eliminate a variable.
Handout
Varsity Tutors

Varsity Tutors: Hotmath: Algebra Review: Compatible Matrices

For Students 9th - 10th Standards
Find a quick, concise explanation of how to compare matrices to see which can be multiplied. Several examples are given to illustrate which matrices can and can not be multiplied.
PPT
Sophia Learning

Sophia: Matrix Multiplication: Lesson 3

For Students 9th - 10th Standards
This lesson introduces matrix multiplication, distinguishes it from multiplying by a scalar, and provides examples of the operation. It is 3 of 2 in the series titled "matrix multiplication."
PPT
Sophia Learning

Sophia: Matrix Multiplication: Lesson 5

For Students 9th - 10th Standards
This lesson introduces matrix multiplication, distinguishes it from multiplying by a scalar, and provides examples of the operation. It is 5 of 2 in the series titled "Matrix Multiplication."
Handout
Purple Math

Purplemath: Scalar and Matrix Multiplication

For Students 9th - 10th Standards
With several easy-to-understand examples worked out, this lesson demonstrates the steps needed to multiply a matrix by a scalar (a constant). True "Matrix multiplication," where two matrices are multiplied to eachother is also...
Handout
Purple Math

Purplemath: Matrix Inversion: Finding the Inverse of a Matrix

For Students 9th - 10th Standards
Inverse matrices are very useful for solving matrix equations. But, given a matrix, how do you invert it? How do you find the inverse? The technique for inverting matrices is kind of clever. For a given matrix A and its inverse A-1, we...
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Lesson Tutor

Lesson Tutor: Multiplying 3 Digits by 2 Digits Wksht 1

For Students 3rd - 8th
A worksheet of nine practice problems is provided here for use by students needing extra help with this concept. A matrix of numbers is provided at the end of the site for the user to find the answers to the questions.
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Lesson Tutor

Lesson Tutor: Multiplying 3 Digits by 2 Digits Wksht 2

For Students 3rd - 8th
A worksheet of nine additional practice problems is provided here for use by students needing extra help with this concept. A matrix of numbers is provided at the end of the site for the user to find the answers to the questions.
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Lesson Tutor

Lesson Tutor: Multiplying 3 Digits by 2 Digits Wksht 3

For Students 3rd - 8th
A worksheet of nine additional practice problems is provided here for use by learners needing extra help with this concept. A matrix of numbers is provided at the end of the site for the user to find the answers to the questions.
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Lesson Tutor

Lesson Tutor: Multiplying 3 Digits by 2 Digits Wksht 4

For Students 3rd - 8th
A activity of nine additional practice problems is provided here for use by students needing extra help with this concept. A matrix of numbers is provided at the end of the site for the user to find the answers to the questions.
PPT
Sophia Learning

Sophia: Scalar Multiplication: Lesson 3

For Students 9th - 10th Standards
This brief lesson will introduce scalars, and demonstrate how to perform scalar multiplication with matrices. It is 3 of 10 in the series titled "Scalar Multiplication."
PPT
Sophia Learning

Sophia: Scalar Multiplication: Lesson 1

For Students 9th - 10th Standards
This brief lesson will introduce scalars, and demonstrate how to perform scalar multiplication with matrices. It is 1 of 10 in the series titled "Scalar Multiplication."
Handout
Hofstra University

Hofstra: Matrix Algebra

For Students 9th - 10th Standards
This site explains what matrix algebra is. Includes examples. It also covers scalar multiples.
Handout
Purple Math

Purplemath: Minors and Cofactors: Expanding Along a Row

For Students 9th - 10th Standards
A "minor" is the determinant of the square matrix formed by deleting one row and one column from some larger square matrix. To find the determinant of the matrix A, you have to pick a row or a column of the matrix, find all the cofactors...
Activity
Texas Instruments

Texas Instruments: Numb3 Rs: Restaurant Rankings

For Teachers 9th - 10th
Based off of the hit television show NUMB3RS, this lesson combines the topics of graph theory and matrix multiplication in order to see the path of customer referrals to different fictional restaurants. Students create a matrix based off...
Activity
Texas Instruments

Texas Instruments: Linear Operator and Intro. To Eigenvalues & Eigenvectors

For Teachers 9th - 10th Standards
In this Derive activity, students use matrix multiplication as a tool for drawing the outlines of a simple stick house. They work in two dimensional space and show the results of multiplying a figure by 2 X 2 matrices.