3.MD.C.5. Recognize area as an attribute of plane figures and understand concepts of area measurement.

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3.MD.C.5.a. A square with side length 1 unit, called “a unit square,” is said to have “one square unit” of area, and can be used to measure area.

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3.MD.C.5.b. A plane figure which can be covered without gaps or overlaps by $n$ unit squares is said to have an area of $n$ square units.

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