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In This Unit of Study…
Students will solve mathematical and real-world problems involving perimeter of rectangles with whole-number side lengths by using a visual model and a formula. As students begin to utilize formulas for the first time, they will discover and discuss the advantages and disadvantages to using them. They will transition from showing all lengths of a rectangle on a diagram to show just what is needed to serve as a reminder. Students will benefit from knowing or being fluently able to remind themselves of how to find the perimeter. With opportunities for repeated reasoning about how to calculate perimeter, students will understand that formulas are summaries of calculations. They will be tasked with finding the perimeter of rectangles when all side lengths are given, as well as finding the perimeter of composite figures composed of nonoverlapping rectangles. Students will also use knowledge from the previous third-grade FLM standards (MA.3.GR.2.1, MA.3.GR.2.2, MA.3.GR.2.3, MA.3.GR.2.4) regarding area to solve mathematical and real-world problems involving the area of rectangles and composite figures composed on nonoverlapping rectangles by using a visual model and a formula.
B.E.S.T. Benchmarks:
- MA.3.GR.2.3 Solve mathematical and real-world problems involving the perimeter and area of rectangles with whole-number side lengths using a visual model and a formula.
- MA.3.GR.2.4 Solve mathematical and real-world problems involving the perimeter and area of composite figures composed of non-overlapping rectangles with whole-number side lengths.
Overarching Key Concepts:
- Solve problems involving perimeter and how it relates to area