"Mastering Math: Decimal Calculations for Elementary School Grades 3-5" Price: ¥1100 "Mastering Math: Fraction Calculations for Elementary School Grades 4-6" Price: ¥1100 There is writing in pencil. There is no writing in pen. Both books have creases on the last page. I had my child repeatedly solve these before they entered cram school. Since the lessons at cram school assume students can do fraction and decimal calculations, these books were very helpful for learning at home. If you don't mind, thank you. #Books #Nature/Mathematics