Matrix Addition

If two matrices have the same number of rows and same number of columns, then the matrix sum can be computed:

If A is an MxN matrix, and B is also an MxN matrix, then their sum is an MxN matrix formed by adding corresponding elements of A and B

Here is an example of this:

Of course, in most practical situations the elements of the matrices are real numbers with decimal fractions, not the small integers often used in examples.