Twelfth graders are introduced to matrices — rectangular grids of numbers — learning scalar multiplication, the determinant, and how matrices organize data and solve systems, a gateway to linear algebra.
Students will be able to…
A matrix is just a grid of numbers — but it’s a surprisingly powerful one. How do we operate on matrices, and what does a determinant tell us about one?
Project this and change the entries and scalar. Watch scalar multiplication scale every entry — and see the determinant update!
Tap any phase to open the teacher moves and student actions.
A matrix is just a grid of numbers — but what can it do?
Teacher models.
Class uses the Matrix Tool.
Students operate.
One matrix.
Aligned to the Common Core State Standards for Mathematics (High School · Precalculus).
Multiply matrices by scalars.
Add, subtract, and multiply matrices of appropriate dimensions.
Use matrices to represent and manipulate data.
Understand the role of the determinant.
Preview the three formative checks. Tap “Sample answer” to see what mastery looks like — hide them before you print for students.
Have students use a matrix and its determinant to solve a 2×2 system of equations (Cramer’s rule). A printable matrices sheet is in the Math library.
Tap a card to flip it, then rate whether you knew it. Built from this lesson’s vocabulary.
A quick self-check with instant feedback, drawn from this lesson’s key terms.
A print-and-go review sheet with a built-in answer key. Tap “Show answer key” to reveal answers, or print the clean version for students.