## Matrix Multiplication

When you add or subtract two matrices, you add or subtract the entries in two matrices of the same size. You might try to multiply two matrices by following a similar strategy. However, matrix multiplication *is not* carried out by multiplying the corresponding entries of two matrices of the same size.

Instead, matrix multiplication is carried out by multiplying the entries in the rows of a matrix by the entries in the columns of the other matrix. This might not seem to be a productive process. However, this process is very useful in many areas of business, economics, and science.

In this section you’ll learn how to carry out this process and apply it to several problems at Ed Magazine.

**Read **in Section 3.2

**Watch **Video Playlist

- Handout: Matrix Multiplication on a Graphing Calculator
- Handout: Matrix Multiplication in Excel
- MathFAQ: Why Multiply Matrices?