The mathematical expression in the image is:

$\frac{\sqrt{5}}{10}$

This can be simplified, but it is already in its simplest form as a fraction. The square root of 5 is an irrational number, and dividing by 10 doesn't change that fact.

If you'd like a decimal approximation, we can calculate:

$\frac{\sqrt{5}}{10} \approx \frac{2.236}{10} = 0.2236$

Would you like further details on this, or do you have any other questions?

Here are some related questions for further practice:

1. What is the decimal value of $\sqrt{2}$ divided by 10?
2. How would you simplify $\frac{\sqrt{8}}{4}$?
3. How do you rationalize the denominator of $\frac{1}{\sqrt{5}}$?
4. Can you express $\frac{\sqrt{12}}{6}$ in its simplest form?
5. How does dividing by 10 affect the value of a square root?

Tip: When simplifying square roots, check if the radicand can be factored into a perfect square for easier simplification.