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In this interactive, students explore two-dimensional scaling, or how the area of a rectangle changes when both length and width are increased proportionately. By investigating how much paint would be required to create murals in different sizes, students learn that doubling a rectangle’s measurements does not double its area, it quadruples it! In the accompanying classroom activity, students use grid paper to draw a series of squares whose dimensions increase proportionately and record the changing data in a table. This resource is part of the Math at the Core: Middle School Collection.