Question: User: $1+1$
1. **State the problem:** Calculate the sum of $1+1$.
2. **Formula used:** Addition of two numbers is given by $a+b$.
3. **Calculation:**
$$1+1=2$$
4. **Explanation:** Adding one and one together results in two because when you combine one unit with another unit, you get two units in total.
5. **Final answer:** $2$