To make the number 4 using exactly four 4's, you can use the following expression:

$4 + \left(\frac{4}{4}\right) + \left(\frac{4}{4}\right) = 4$

Here's how it works:

1. Divide 4 by 4 to get 1.
2. Divide the other 4 by 4 to get another 1.
3. Add the results: $4 + 1 + 1 = 4$.

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

Here are five related questions you might find interesting:

1. How can you make 3 using four 4's?
2. How can you make 2 using four 4's?
3. Can you create the number 9 using four 4's?
4. What are other ways to make 4 using four 4's?
5. How can you make 6 using four 4's?

Tip: Always think of ways to combine basic operations like addition, subtraction, multiplication, division, and even square roots or factorials to creatively reach the target number.