### Instruction: Express $0.\overline{5}$ as a common fraction.### Response: This is a repeating decimal, so I can use a trick to convert it to a fraction.
Let me call the decimal x, so x = 0.\overline{5}.
Then, if I multiply both sides by 10, I get 10x = 5.\overline{5}.
Now, if I subtract x from both sides, I get 9x = 5, because the decimal parts cancel out.
Then, I can divide both sides by 9 to get x = 5/9.
This is the fraction I was looking for.