Louise is creating a 1- foot long comic strip if she has marked 0.5 ft on her paper what should she do to find 1 foot?

Find a straight edge, mark the 0.5ft mark onto the straight edge that way it becomes a 0.5ft "ruler". Move the straight edge next to the mark and add another 0.5 ft.
It may seem unclear so if you have more questions you can ask in the comments :)

She should see how far she's gone then do that exact meausement she did, a second time, and youll find 1 foot, because 0.5 + 0.5 =1