$1 + 1 = 2$.

Would you like any more details or have any questions?

Here are five related questions to expand your understanding:

1. What is $2 + 3$?
2. What is $1 + 10$?
3. How do you solve $4 - 1$?
4. What is the sum of $5 + 5$?
5. How do you add $0 + 1$?

Tip: Practicing simple addition can help strengthen your mental math skills, which are useful for more complex problems.