If a matrix is of order m×n elements, it has mn elements. So, if the matrix has 8 elements, we will find the ordered pairs m and n.

mn = 8

Then, ordered pairs m and n can be

m×n be (8×1),(1×8),(4×2),(2×4)

Now, if it has 5 elements

Possible orders are (5×1), (1×5).