Sansu Pyramid Drill for 3rd Graders This was needed when my child was considering attending Try tutoring, and I purchased it on Mercari. However, they ended up going to a different塾 (cram school), so it became unnecessary. It is new and unused. Math教材 (teaching materials) for 3rd grade elementary school students, the Pyramid series. - Title: Pyramid - Check Note: Pyramid Check Note - Answer and Explanation: Pyramid Answer and Explanation - Grade: Math, 3rd Grade Thank you for looking.