Write 56/13 as a mixed number or fraction in simplest form.

The mixed number equivalent of 56/13 is:

$$4 \frac{4}{13}$$

To convert to a mixed number, we first find the quotient and remainder:

$$56 \div 13 = 4 \text{ with a remainder of } 4$$

So we can write:

$$\frac{56}{13} = 4 + \frac{4}{13}$$

To simplify further, we note that there are no common factors between 4 and 13, so this fraction is already in its simplest form.