You can create the number 73 using four 4's as follows:

$(44 / 4) + (4 \times 4) = 73$

Explanation:

• $44 / 4 = 11$
• $4 \times 4 = 16$
• $11 + 16 = 73$

Would you like more details or another explanation?

Here are 5 related questions:

1. Can you create the number 100 using four 4's?
2. What other operations can you use with four 4's to form different numbers?
3. How would you represent 20 using four 4's?
4. Can you express 0 using four 4's?
5. What is the largest number you can make using only four 4's?

Tip: Experiment with combinations of mathematical operations (addition, multiplication, division, and parentheses) to create more numbers using a set of digits!