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

Would you like more details or have any questions?

Here are 5 related questions to consider:

1. What is $2 + 2$?
2. What is $1 + 2$?
3. How do you perform addition with larger numbers?
4. What is $1 - 1$?
5. How is addition different from multiplication?

Tip: Addition is the process of combining two or more quantities to get a total sum.