The sum of 4 plus 4 is:

$4 + 4 = 8$

Would you like more details or have any questions?

Here are 5 related questions to explore:

1. What is $4 \times 4$?
2. What is $4 + 4 + 4$?
3. How do you solve $4 + x = 8$ for $x$?
4. What is the square of 4?
5. What is the difference between 10 and 4?

Tip: Addition is commutative, meaning $a + b = b + a$.