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Varsity Tutors
Varsity Tutors: Hotmath: Matrix Multiplication
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...
Interactive Mathematics
Interactive Mathematics: Matrices
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.
OnlineMathLearning.com
Online Math Learning: Multiply a Vector by a Matrix
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...
Cool Math
Coolmath: Inverse Matrices
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!
Khan Academy
Khan Academy: Use Matrices to Transform 3 D and 4 D Vectors
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.
CK-12 Foundation
Ck 12: Algebra: Limitations of Matrix Multiplication
[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.
Ministerio de Educacion, Cultura y Deporte (Spain)
Cnice: Algebra Matricial
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.
CK-12 Foundation
Ck 12: Algebra: Solving Systems by Multiplying One Equation
[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.
Varsity Tutors
Varsity Tutors: Hotmath: Algebra Review: Compatible Matrices
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.
Sophia Learning
Sophia: Matrix Multiplication: Lesson 3
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."
Sophia Learning
Sophia: Matrix Multiplication: Lesson 5
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."
Purple Math
Purplemath: Scalar and Matrix Multiplication
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...
Purple Math
Purplemath: Matrix Inversion: Finding the Inverse of a Matrix
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...
Lesson Tutor
Lesson Tutor: Multiplying 3 Digits by 2 Digits Wksht 1
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.
Lesson Tutor
Lesson Tutor: Multiplying 3 Digits by 2 Digits Wksht 2
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.
Lesson Tutor
Lesson Tutor: Multiplying 3 Digits by 2 Digits Wksht 3
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.
Lesson Tutor
Lesson Tutor: Multiplying 3 Digits by 2 Digits Wksht 4
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.
Sophia Learning
Sophia: Scalar Multiplication: Lesson 3
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."
Sophia Learning
Sophia: Scalar Multiplication: Lesson 1
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."
Hofstra University
Hofstra: Matrix Algebra
This site explains what matrix algebra is. Includes examples. It also covers scalar multiples.
Purple Math
Purplemath: Minors and Cofactors: Expanding Along a Row
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...
Texas Instruments
Texas Instruments: Numb3 Rs: Restaurant Rankings
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...
Texas Instruments
Texas Instruments: Linear Operator and Intro. To Eigenvalues & Eigenvectors
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.