Matrix Addition
We can only add matrices of the same order.
Example:
Matrix addition is very simple; we just add the corresponding elements.
It is not possible to add matrices that do not have the same order, as shown in the following example:

Matrix Subtraction
Similarly, we can only subtract matrices of the same order.
Example:
We subtract the corresponding elements.
It is not possible to subtract matrices that do not have the same order as in the following example:

Videos
The following video gives an introduction to matrices and examples of adding and subtracting matrices.
The arithmetic of matrices -
Professor Edward Burger explains the addition and subtraction of matrices.
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