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The two matrices and their answer must be of the same dimensions.

Each element of the answer matrix is the sum of the elements in the corresponding elements on the matrices that are being added.

In algebraic form,

if A = {aij} where 1 ≤ i ≤ m, 1 ≤ j ≤ n is an mxn matrix

B = {bij} where 1 ≤ i ≤ m, 1 ≤ j ≤ n is an mxn matrix

and C = {cij} = A + B,

then C is an mxn matrix and cij = aij + bij for all 1 ≤ i ≤ m, 1 ≤ j ≤ n

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