This math topic focuses on calculating the area of a portion of a rectangle given its total area and a specific fraction that represents the portion of interest. It involves understanding and applying the concept of fractions to find part areas of rectangles. This is an introductory level topic within a broader unit on the logical understanding of area and perimeter. The problems require multiplying the total area by the given fraction to determine the area of the shaded or specific part. This enhances skills in basic geometry and fractional multiplication.