The sum of $2 + 2$ is $4$.

Would you like any further details or explanations? Here are five related questions to explore:

1. What is $2 + 3$?
2. Can you solve $5 + 7$?
3. What is $2 \times 2$?
4. What is $4 + 6$?
5. How do you solve $10 - 5$?

Tip: Always add numbers from right to left when dealing with multi-digit additions!