# How do I find the additive identity matrix?

##### 2 Answers

The additive identity matrix would be a zero matrix (all its entries are zeros.)

The sum between two matrices can be done if and only if the two matrices are **similar**, that means that they have the same numbers of rows and columns.

Also the additive identity matrix has to be **similar** to the other, so every **shape** of matrix has its identity matrix.

The elements, obviously, are **all** zeros.

E.G.

The matrix with the shape: 3 rows and 4 columns has this identity matrix:

The sum between two matrices can be done if and only if the two matrices are **similar**, that means that they have the same numbers of rows and columns.

Also the additive identity matrix has to be **similar** to the other, so every **shape** of matrix has its identity matrix.

The elements, obviously, are **all** zeros.

E.G.

The matrix with the shape: 3 rows and 4 columns has this identity matrix: