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

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Here are some related questions for further practice:

1. What is $3 + 3$?
2. Calculate $5 + 7$.
3. What is the result of $8 + 9$?
4. Add $10 + 15$.
5. What is $4 + 6$?
6. Calculate $7 + 12$.
7. What is the result of $13 + 8$?
8. Add $20 + 25$.

Tip: When adding two numbers, start by combining the digits in the ones place and carry over any extra value to the tens place if needed.