$1 + 1 = 2$

Would you like to dive deeper into addition concepts, or do you have any other questions? Here are some related problems:

1. What is $2 + 3$?
2. What is $5 - 1$?
3. What is $4 + 4$?
4. What is $7 + 2$?
5. What is $10 + 15$?

Tip: Addition is one of the four basic operations in arithmetic and is commutative, meaning $a + b = b + a$.