This is a set of the 2021 edition of Yotsuya Otsuka's Weekly Test Problem Collection for 4th graders, including both math problems and answer explanations. There are marks where the previous owner's name was erased, but there is no writing on the inside pages. The condition is listed as "no noticeable stains." The condition is very good. Please understand that this is a used item that was used by a child. Retail price: 1760 yen per book - Series Name: Weekly Test Problem Collection - Year: 2021 - Grade: 4th Grade - Subject: Math - Format: Problem Collection - Format: Answers and Explanations - Format: Problem Collection Thank you for looking.