I prefer to use geometric shapes to create patterns on my classroom calendar because it gives my students a chance to practice the shape names (in Spanish in my room!) in addition to practicing patterning, which is an important skill! Included in this set is 3 geometric shapes- triangle, square, and circle, with numbers to 31 pre-printed on the shape, and 5 additional blank pieces for each shape. You can use the same shape for the whole month, or mix them to create a pattern. These are best printed on cardstock and laminated for durability. See sets 2 and 3 for additional shapes.