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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.
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):
61 to 90 Minutes
Materials and Resources:
Algebra II textbook (student and teacher edition)
Calculator (graphing, if available)
Bell Ringer Matrices (in attachments)
Website for scalar multiplication with matrices:
Website for adding and subtracting matrices:
Website for multiplying matrices:
Worksheets to be copied for all students:
Adding and Subtracting
Worksheet for Accelerated Students: copy as needed
Technology Resources Needed:
Desktop computer/Interactive Whiteboard
Graphing Calculator, if available
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.
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.
As the students enter the classroom, the teacher will place the bell ringer, "Bell Ringer Matrices", from the attachment section on the interactive whiteboard. The teacher will give the students 3 minutes to complete. The teacher will give the students 1 minute to talk with a partner. The teacher will ask for suggestions from the class. The answers are in white. The teacher will highlight below “Answers” and change the color to reveal the answers.
The teacher will use the exit slip from Math-Aids,
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.
The teacher will grade the exit slip from the material section from Math-Aids.
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
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.