This is a Criteria B&C summative assessment for Grade 7 (MYP2). I use it after finishing the Numbers skills unit, at the beginning of the Algebra Unit. It contains full criteria descriptors (rubrics), as well as command terms and detailed task explanation with reference to the unit-specific information. It contains explorations of Triangular, Square, Pentagonal and Hexagonal Numbers. I usually teach Triangular Numbers in Grade 6 (MYP1), so the students are familiar with the n-th term