Final answer:
When comparing -5/2 and -1/2 on a horizontal number line, -5/2 is smaller or less than -1/2.
Step-by-step explanation:
When comparing the numbers -5/2 and -1/2 on a horizontal number line, we can see that -5/2 is to the left of -1/2. This means that -5/2 is smaller or less than -1/2.