To make the number 5 using exactly four 4's, you can use the following mathematical expression:

$\frac{(4 \times 4) + 4}{4} = 5$

Here's how it works:

1. Multiply 4 by 4 to get 16.
2. Add 4 to 16 to get 20.
3. Divide 20 by 4 to get 5.

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 1 using four 4's?
2. How can you make 10 using four 4's?
3. Can you create the number 7 using four 4's?
4. What other operations can be used with four 4's to make different numbers?
5. How can you make 0 using four 4's?

Tip: When using a set number of digits and mathematical operations, consider using parentheses and different operations like addition, subtraction, multiplication, division, and factorials to reach your target number.