This math topic focuses on determining the total area of a rectangle when given the area of a fraction of that rectangle. The problems involve various fractional parts such as 1/4, 1/2, 1/5, and 2/5 of the rectangles with specified areas for these parts. Students must use their understanding of fractions and area to infer the full area of the rectangles, practicing critical thinking and arithmetic operations related to proportions and scaling within a context of geometry. Each problem provides multiple-choice answers for students to select from.
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The area of the 1/2 that is filled in is 9. What is the area of the full rectangle?
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