K'Nex Intermediate Math and Geometry 920-Piece Set with Teacher's Guide (79028A)The K'Nex 79028A Intermediate Math and Geometry set builds 95 K'NEX Maths and Geometry models, up to four simultaneously. The 920 piece set is sufficient for 8 to 16 students and is designed to address critical mathematical concepts in the secondary school classroom. It provides instructional models that will help to enhance your students' understanding of important concepts and algorithms. Suitable for ages 9 and up. Set includes Building