This Application Problem is a part of the Lesson 7, Unit 8, Grade 2. Mrs. Libarian's students are picking up tangram pieces. They collect 13 parallelograms, 24 large triangles, 24 small triangles, and 13 medium triangles. The rest are squares. If they collect 97 pieces in all, how many squares are there? This is a two-step put together with addend unknown problem type.