The sum of $4 + 4$ is $8$.

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Here are some related questions:

1. What is $4 \times 4$?
2. What is $4^2$ (4 squared)?
3. What is $4 - 4$?
4. What is $8 \div 4$?
5. What is $4 + 8$?

Tip: Basic arithmetic operations (addition, subtraction, multiplication, division) follow a consistent order of operations called PEMDAS (Parentheses, Exponents, Multiplication and Division, Addition and Subtraction).