Thanks. What made the problem more confusing at first is that it is combined with learning to measure. On the first side of the page, my daughter had to measure about 10 different lines with a ruler. Then on the back, use the data from the front page to create a line plot. At the top of the page was already a line with arrows at each end. I finally concluded that line was to be used to diagram the line plot. But at the bottom of the page was a slightly shorter line with no arrows. Once I figured out what the goal was, I realized this second line was the origin of my daughter's confusion. It was also mine, and for the time being decided that it must have been a mistake that wasnt ever meant to print. But she had two worksheets to do; one for inches and one for centimeters. And the back of both sheets were identical.