The calculation $5\pi \times 5$ can be solved as follows:

$5\pi \times 5 = 25\pi$

Therefore, $5\pi \times 5 = 25\pi$.

Would you like any further details or have any questions? Here are five questions you might consider asking:

1. How do I convert $\pi$ to a decimal approximation in calculations?
2. What are the properties of the number $\pi$?
3. Can you explain the significance of $\pi$ in geometry?
4. How do I calculate the circumference of a circle using $\pi$?
5. What are some common formulas involving $\pi$?

Tip: When multiplying numbers with $\pi$, keep $\pi$ in its symbolic form for exact answers, and use its approximate value (3.14159) for decimal calculations.