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This webpage contains a link to a downloadable Geometer's Sketchpad activity that develops early algebraic reasoning. Students use the row and column sums of numerical values assigned to geometric shapes on a 4 x 4 grid to determine the values of each shape. They can create problems for a partner to solve. The page includes a 3-minute instructional video and downloadable PDFs of teacher notes and student worksheets. The activity opens on Geometer's Sketchpad and on iOS with Sketchbook Explorer (cataloged separately).
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