Area as Additive

With our Area as Additive lesson plan, students learn how to find the area of irregular shapes by breaking them into rectangles and using addition.

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Our Area as Additive lesson plan teaches students strategies for finding the area of rectangular figures that involve addition. During this lesson, students are asked to use their creativity to design a park using given parts that have specific areas (i.e., trees are 4 square units), allowing them to practice using square units and figuring out how they fit together in a given space. Students are also asked to practice using horizontal and vertical lines to break irregular shapes into rectangles; they then use these rectangles to find the area of the irregular shape.

At the end of the lesson, students will be able to find the area of rectangular figures by decomposing them into non-overlapping rectangles and then adding the parts.

Common Core State Standards: CCSS.Math.Content.3.MD.C.7.D

Additional information

grade-level

3rd Grade

subject

Math