These look like the pattern blocks my kdg class uses during our Saxon Math lessons. I have always said that if I had learned to quilt when I was a teen, I would not have had nearly as much trouble with HS geometry. And, no...sorry...these pattern blocks do not look like tangrams. A tangram is a square shape made up of 7(if I remember correctly...could be 6...I am on summer vacation) shapes...2 of each: large, medium, and small triangles and a small square. I can picture in my mind...just not remembering exactly. We use them in Kdg sparingly...they are very frustrating for most kdg kiddos.