Integrating mathematics and literacy allows students to develop an understanding of the place of mathematics in their world. Students are introduced to the idea of shapes through a read-aloud session with an appropriate book. They then use models to learn the names of shapes, work together and individually to locate shapes in their real-world environment, practice spelling out the names of shapes they locate, and reflect in writing on the process. This lesson provides opportunities to engage students using many different learning modalities.

I use this activity to help students practice with quadrilateral attributes.  It's a memory game, so it makes it fun.There are two sets of cards.  You can use one set at a time, or both sets together.

Lesson objective: Explore the characteristics that define different shapes and the names of those shapes.
Students bring prior knowledge of naming shapes regardless of their orientations or overall size from (K.G.2). This prior knowledge is extended to defining and non-defining attributes as students determine what things are true for all triangles, all squares, etc. A conceptual challenge students may encounter is thinking attributes such as size, color, and orientation are what determine a shape.
The concept is developed through a sorting activity, which encourage students to consider common attributes and predict which shape can be added to a circle based on a defining attribute.
This work helps students deepen their understanding of numbers because shapes can be defined by number of sides, angles, and faces. 
Students engage in Mathematical Practice 3 (Construct viable arguments and critique the reasoning of others) as they use clear definitions with peers and define attributes and provide a viable argument reasoning why a shape lacks specific attributes.

I use this activity to reinforce the vocabulary used when practicing with polygons.  Students are asked to describe a polygon by identifying what it is, but also what it is NOT.