To simplify the expression $\sqrt{27} \cdot \sqrt{3}$, we can use the property of square roots:

$\sqrt{a} \cdot \sqrt{b} = \sqrt{a \cdot b}$

Applying this to our problem:

$\sqrt{27} \cdot \sqrt{3} = \sqrt{27 \cdot 3} = \sqrt{81}$

Now, since $\sqrt{81} = 9$, the simplified answer is:

$9$

Would you like a further breakdown of any step?

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Here are some related questions:

1. How do you simplify expressions with square roots?
2. What are the properties of square roots for multiplication and division?
3. How would you solve $\sqrt{45} \cdot \sqrt{5}$?
4. Can you multiply square roots with different variables (like $\sqrt{x} \cdot \sqrt{y}$)?
5. How do you simplify the square root of a non-perfect square?

Tip: When multiplying square roots, try to simplify each square root separately before multiplying if possible—it can sometimes make the problem easier to solve.