❖ This tutorial lesson provides a basic introduction to Adding and Subtracting Matrices. Also, this lesson contains many examples and practice problems on Addition and Subtraction of Matrices.

❖ Any matrix can only be added (subtracted) to another matrix if the two matrices have the same size (dimension, order).

❖ To add two matrices, just add the corresponding entries, and place this sum in the corresponding position in the matrix which results.

So, any matrix can only be added to another matrix if The size of the \(1\)st matrix = The size of the \(2\)nd matrix

Otherwise, the answer will be undefined.

❖ The number of rows and columns that a matrix has is called its size, its order, or its dimension.