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

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Here are five related questions:

1. What is $3 + 3$?
2. What is $4 - 2$?
3. What is $2 \times 2$?
4. What is $2^2$?
5. What is $10 + 2$?

Tip: Understanding simple addition is the foundation for mastering more complex arithmetic operations.