For adding matrices, their dimension should be equal.
\The dimensions of matrix, A and B are 3×2
\First write the dimension of the matrix.
\The first matrix A is 
The matrix has 3 row and 2 columns, so dimensions of matrix are
.
The second matrix B is 
The matrix has 3 rows and 2 columns, so dimensions of matrix are
.
The dimensions of matrix are equal. The operation of addition is possible.
\Perform the operation A + B
\Add the corresponding elements. \ \
\
(Add the elements)
(Simplify)
A + B 