Your 5th graders will learn to classify triangles and quadrilaterals with these 12 polished, no-prep activities aligned to the Common Core. Sorting polygons by properties will engage your students in higher-order thinking. Watch their geometry skills blossom as they place 2d figures into categories and subcategories. Students will learn to identify the following attributes: parallel, perpendicular, regular, congruent, concave, convex, symmetry, acute angles, right angles, obtuse angles, and ve