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

Would you like more details or have any questions?

Here are some related questions you might find interesting:

1. What is $1 + 2$?
2. How do you add two numbers?
3. What is the result of $2 + 3$?
4. What are the properties of addition?
5. How can you use addition in everyday life?

Tip: When adding numbers, you can use a number line to help visualize the process.