Students classify shapes according to whether they contain right angles only, all angles smaller than a right angle, or at least one angle larger than a right angle. One student thinks of a shape. The others ask questions about its properties, trying to guess it. Investigate and predict the results of combining, subdividing, and changing shapes. Students investigate the shapes found in their lunches and then discuss how the shapes change as they nibble away.
Students combine tangram pieces to create a variety of shapes.
Use tessellations to explore properties of geometric shapes and their relationships to the concepts of area and perimeter. Students use square, triangular, and hexagonal grid paper to create colorful designs. They discuss why these polygon shapes fit together like a puzzle. Students use Unifix cubes or pattern blocks to create designs. Students work through the Tiling a Floor lesson that is described in the First FourStandards of this Framework .