Maryland Common Core Standards
MA.CC.MD. Measurement & Data
Solve problems involving measurement and conversion of measurements for a larger unit to a smaller unit.
4.MD.3. Apply the area and perimeter formulas for rectangles in real world and mathematical problems. For example, find the width of a rectangular room given the area of the flooring and the length, by viewing the area formulas as a multiplication equation with an unknown factor. (SC 4)