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Add two same-size matrices by summing each corresponding pair. Choose 2×2 or 3×3; every cell's arithmetic is shown.
2×2/3×3 entry-wise sums with every cell worked.
(A + B)[i,j] = A[i,j] + B[i,j]
| Symbol | Meaning |
|---|---|
| A + B | Entry-wise sum matrix |
[1,2;3,4] + [5,6;7,8] = [6,8;10,12].
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Yes — addition is only defined for identical dimensions.
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Content updated: September 2026