A collection of abacus calculation problems for levels 6 and 7. Preparation for certification exams, brain training, homeschooling Abacus - Title: Abacus Problem Collection - Level: 6th Grade - Title: Mental Calculation Print Collection - Level: 6th Grade The 7th grade cover is slightly faded, so I will include a notebook and printouts as a bonus. Thank you very much! Thank you for viewing. No price reduction stickers. Please comment if you would like to purchase multiple items together. Thank you for viewing.