Final answer:
To find the difference between the longest and shortest piece of wire, you need to calculate the range.
Step-by-step explanation:
The difference between the longest and shortest piece of wire that Meg measured is the range of the measurements. To find the range, you subtract the length of the shortest piece from the length of the longest piece. For example, if Meg measured a wire that was 10 cm long and another wire that was 5 cm long, the range would be 10 cm - 5 cm = 5 cm.