Thank you for viewing. This is a textbook for the Mathematics Certification Level 9 (equivalent to 3rd grade elementary school). There are markings on some pages, a total of 4-5 pages, which have been erased with an eraser, but faint traces may be visible. There is a check mark written in ballpoint pen before the problem on page 46 (last photo). The other pages are clean and have not been solved. Please understand that this is a used item before considering a purchase.