More Lessons for Grade 9
Examples, videos, worksheets, solutions, and activities to help Algebra students learn about matrix multiplication.
How to multiply two matrices?
1. Check that number of columns in the first matrix is equal to the number of rows in the second matrix. (If they are not equal then it is not possible to multiply these two matrices.)
2. Multiply element by element across the rows of the first matrix and down the columns of the second matrix and add the products. (See the videos below for more details)
3. Check that the result is a matrix with the same number of rows as the first matrix and the same number of columns as the second matrix.
Multiply a 2 x 3 matrix by a 3 x 1 matrix
multiply a 2 x 3 matrix by a 3 x 2 matrix
Matrix multiplication (part 1)
Multiplying two 2 x 2 matrices.
Matrix multiplication (part 2)
More on multiplying matrices.
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