The expression $\frac{1}{\sqrt{5}}$ can be simplified or written in a more useful form. If you'd like to calculate it, here's the approximation:

$\frac{1}{\sqrt{5}} \approx 0.4472$

If you'd like to rationalize the denominator (eliminate the square root from the denominator), you can multiply both the numerator and denominator by $\sqrt{5}$:

$\frac{1}{\sqrt{5}} = \frac{1 \times \sqrt{5}}{\sqrt{5} \times \sqrt{5}} = \frac{\sqrt{5}}{5}$

So, the exact simplified form is:

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

Would you like more details or have any questions about this?

Here are 5 related questions:

1. What is the decimal approximation of $\sqrt{5}$?
2. How can you rationalize a denominator in a general case?
3. What is the value of $\frac{1}{\sqrt{2}}$?
4. How do you find the square root of non-perfect squares like 5?
5. What is the significance of rationalizing a denominator?

Tip: Rationalizing denominators is often done to simplify expressions, especially when dealing with irrational numbers.