Question: User: $2 + 2$
1. **State the problem:** We need to find the sum of $2 + 2$.
2. **Formula used:** Addition of two numbers is given by $a + b$ where $a$ and $b$ are numbers.
3. **Calculate:**
$$2 + 2 = 4$$
4. **Explanation:** Adding $2$ and $2$ means combining two groups of two items each, resulting in a total of four items.
5. **Final answer:** $4$