Here is a teacher resource packet (10 pages including the answer key) on finding areas of irregular shapes (such as L-shaped and U-shaped figures) using rectangles (no triangles). Packet includes 5 student practice worksheets with answer key. Step-by-step explanations and examples of strategies for solving problems by adding smaller areas inside the figure or by subtracting missing pieces from a larger rectangle. Also includes a 3-page section to help teach how to find and label missing dimensions, by adding and subtracting other labeled sides. Supports geometry / measurement curriculum standards. I used this entire packet with my students and it took two 75-minute periods to discuss and complete.
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