There is only one area calculation problem here, and it is followed by a detailed explanation. Consider projecting this as a teaching tool, covering the answer until learners have shared their own. They are instructed to draw a rectangle segmented into three rows and five columns. Scholars calculate the square units of area for the rectangle. Consider expressing the length and width of each side before they divide it, giving specific units so they can include this in their answer. Fifteen feet by nine feet would work to make the dimensions of the squares exactly three by three. 

Common Core

3.MD.C.7.a 3.MD.C.7.b