Showing Elementary - Mathematics - Math Grade 4 - Grade 4 - (5) Algebraic reasoning: Expressions and equations - Math.4.5.C (C) use models to determine the formulas for the perimeter of a rectangle (l + w + l + w or 2l + 2w), including the special form for perimeter of a square (4s) and the area of a rectangle (l x w); and

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