Tangram Pattern Cards Gr 2 & Up 16 by Frank Schaffer Publications/Carson Dellosa Publications. $8.99. ID-7962 Use these hands-on activities to promote critical thinking and problem-solving skills. Every activity helps students develop their shape recognition and spatial relationship skills. Excellent for activity centers. Includes 16 - 8 1/2" x 11" (21.5 x 28cm) cards, double-sided and coated for durability, and an activity sheet.