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- Erica A., Teacher
- Durham, NC
Matrix Multiplication Teacher Resources
Find Matrix Multiplication educational ideas and activities
Twelfth graders explore transforming matrices representing figures in the coordinate plane by entering data points of figures such as triangles and quadrilaterals into a matrix. Students dilate, rotate, reflect, and translate the figures by multiplying by translation matrices.
Students examine dilation with matrices. In this dilation lesson, students write a conjecture for how the scale factor determines the size of an image. Students use their conjecture to write a matrix multiplication problem for the illustrated triangle where the image is larger. Students also determine the coordinates of the vertices of the image triangle.
There are four activities in this extensive lesson covering the identity matrix and scaling, the linear representation of translations, the linear representation of rotations, and reflections. In small groups, they use the Cabri II computer program to move objects and make observations. In their groups, they discuss, solve and answer worksheet questions for each activity.