The sum of $1 + 1$ is $2$.

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Here are 5 related questions:

1. What is $1 + 2$?
2. What is $2 + 2$?
3. How do you solve $1 + 1 + 1$?
4. What is the result of $1 + 0$?
5. How do you add three numbers together?

Tip: Adding numbers is the most basic operation in arithmetic and is the foundation for more complex math concepts.