Matrix Multiplication and Addition

To commute or not to commute, that is the question. The 26th segment in a 32-segment activity focuses on the effect of performing one transformation after another one. The pupils develop the procedure in order to multiply two 2 X 2 matrices and whether the operation is commutative or not. The class continues with addition of matrices and the role of the zero matrix.

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CCSS: Designed
Additional Tags
Instructional Ideas
  • Lead a discussion about what operations are commutative and which ones are not with real numbers
  • Provide several opportunities for the class to practice multiplication and addition with matrices
Classroom Considerations
  • The class should be familiar with multiplying a 2 X 2 matrix and a 2 X 1 matrix
  • The teacher notes provide suggestions on what instructional practice to use for each section
  • The exit ticket captures whether individuals understand all the lesson concepts
  • None