Add, Subtract, and Multiply Matrices
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This lesson provided by:
Author: Morgan Boyd
System: Dothan City
School: Honeysuckle Middle School

General Lesson Information
Lesson Plan ID:
35674
Title:

Add, Subtract, and Multiply Matrices
Overview/Annotation:

The lesson will introduce the concept of a matrix. The matrix is labeled by its rows and columns. This lesson will teach the concept of adding, subtracting, scalar multiplication, and multiplication of matrices. This lesson will be a prerequisite for solving systems of equations with matrices.

This lesson results from the ALEX Resource Gap Project.

Associated Standards and Objectives
Content Standard(s):
Mathematics MA2015 (2015) Grade: 9-12 Algebra II 9 ) (+) Add, subtract, and multiply matrices of appropriate dimensions. [N-VM8]

Mathematics MA2015 (2015) Grade: 9-12 Algebra II with Trigonometry 9 ) (+) Add, subtract, and multiply matrices of appropriate dimensions. [N-VM8]

Local/National Standards:

Primary Learning Objective(s):

The student will be able to multiply a scalar by a matrix.

The student will be able to add matrices.

The student will be able to subtract matrices.

The student will be able to multiply matrices.

Additional Learning Objective(s):

Preparation Information
Total Duration:

61 to 90 Minutes

Materials and Resources:

Technology Resources Needed:

Desktop computer/Interactive Whiteboard

Graphing Calculator, if available

Background/Preparation:

Teacher:

The teacher will need to preview the videos and other materials on the Khan Academy website. The website has interactive sessions after the introduction. The teacher can pick and choose the problems and material according to the skill level of the class.

Student:

The student needs to know that matrices are labeled by their dimensions like pieces of wood. An example is a 4 x 8 piece of plywood. The student needs to be able to write linear equations in standard form.

Procedures/Activities:
Attachments: **Some files will display in a new window. Others will prompt you to download.

Assessment
Assessment Strategies

Informal:

The teacher will solicit questions while the students are watching Khan Academy. The teacher will ask students to answer the interactive questions. The teacher will monitor the students as they work with a partner.

Formal:

The teacher will grade the exit slip from the material section from Math-Aids.

Acceleration:

Intervention:

The students will work with partners and the teacher will do one-on-one instruction as needed.

Each area below is a direct link to general teaching strategies/classroom
accommodations
for students with identified learning and/or behavior problems such as: reading
or math performance below grade level; test or classroom assignments/quizzes at
a failing level; failure to complete assignments independently; difficulty with
short-term memory, abstract concepts, staying on task, or following directions;
poor peer interaction or temper tantrums, and other learning or behavior problems.

Be sure to check the student's IEP for specific accommodations.