As shown in the photos, the Japanese language section has writing on 7 pages, up to page 15 of the 5th lesson. The writing will be erased before selling. Examples of the erasure are shown. The math section also has writing, as shown in the photos, on only 2 pages of the 1st lesson, which will be erased. The purchase date is a bit old, but I think the problems themselves are still usable. There is a feeling of use due to aging, so there are scratches and folds on the outer cover, etc. The answer keys for both books have been detached but are included. Please understand that these are used books. Thank you. ^-^ "Z-Kai Grade Up Problem Collection Elementary School 4th Grade Math Calculation/Figures" "Z-Kai Grade Up Problem Collection Elementary School 4th Grade Japanese Reading Comprehension" Z-Kai Editorial Department #Z-Kai Editorial Department #Books #Nature/Mathematics 4th Grade