1. **State the problem:** Calculate the sum of seven 7's added together. 2. **Formula used:** When adding the same number multiple times, use multiplication: $$\text{Sum} = n \times a$$ where $n$ is the number of times and $a$ is the number. 3. **Apply the formula:** Here, $n=7$ and $a=7$, so $$\text{Sum} = 7 \times 7$$ 4. **Calculate:** $$7 \times 7 = 49$$ 5. **Final answer:** The sum of seven 7's is **49**.