First grade students used pattern blocks as manipulatives to learn about geometry. In this lesson students see how shapes can be combined or taken apart to make other shapes. First students reviewed the defining attributes of two-dimensional shapes by identifying the shapes and how many sides and vertices different shapes have. Students then used pattern blocks to compose two-dimensional and composite shapes. Students used the shapes they created to make new shapes. For example, three triangles can make a trapezoid and two trapezoids can make one hexagon. This activity helps students to use both logical and algebraic reasoning to better understand shapes.