3.6(D): Decompose composite figures formed by rectangles into non-overlapping…
Decompose composite figures formed by rectangles into non-overlapping rectangles to determine the area of the original figure using the additive property of area.
The Texas Essential Knowledge and Skills (TEKS) for Mathematics outcome 3.6(D) (Geometry and measurement) for Grade 3 says: “Decompose composite figures formed by rectangles into non-overlapping rectangles to determine the area of the original figure using the additive property of area.” This Fieldbook unit teaches it hands-on, with everyday materials and a printable teacher guide and student sheet for every lesson. Official wording: Texas Essential Knowledge and Skills (TEKS) for Mathematics.
Fence It, Fill It: Area and Perimeter Grades 3–4
Which mat is really the biggest? Does the same fence always hold the same garden? Can the same rug need more edging? Four lessons where students tile, stretch rope and chalk the schoolyard to find out that area and perimeter measure different things.
- How much turf for an L-shaped playground? 50–60 min
Teams chalk a real L-shaped playground in the schoolyard, split it into rectangles to find its area, and discover that cutting a corner off a rectangle takes away area but leaves the perimeter exactly the same. Then they design their own playground to a set of criteria.
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