"Genius Drill to Cultivate Thinking Skills: The Strongest Solution Method for Word Problems 'Maruichi Calculation': For Elementary School Students Grade 4 and Up" Takeshi Miyamoto Price: ¥1000 #TakeshiMiyamoto #Takeshi_Miyamoto #Book #Nature/Mathematics No writing inside. I forgot I bought this, and my child has grown up, so I am selling it. Thank you.