Question: User: 1-5=?
1. **State the problem:** We need to find the result of the subtraction $1 - 5$.
2. **Recall the subtraction rule:** When subtracting a larger number from a smaller number, the result is negative.
3. **Perform the subtraction:**
$$1 - 5 = 1 + (-5)$$
4. **Calculate:**
$$1 + (-5) = -4$$
5. **Conclusion:** The answer to $1 - 5$ is $-4$.