The answer is 2.

Would you like further explanation or details? Here are five related questions for further exploration:

1. What is the sum of 1+2?
2. How do addition and subtraction relate to each other?
3. What is the additive identity property?
4. How can you write 1+1 in a different mathematical form?
5. What is the importance of addition in real-world scenarios?

Tip: Addition is one of the fundamental operations in mathematics, forming the basis for more complex calculations!