## Thinking Mathematically (6th Edition)

When $0$ is added to itself, the sum is $0$, which is equal, and not greater, than the original number.
We need to find a counterexample to the statement: If a number is added to itself, the sum is greater than the original number. One such example would be the number $0$. $0 + 0 = 0$ When $0$ is added to itself, the sum is $0$, which is equal, and not greater, than the original number.