⭐️ One page a day! For calculation training! ○ One page a day, 6 pages per week, structured in a manageable volume. ○ A textbook that allows for daily study, like a "diary." ○ Develop basic calculation skills while cultivating study habits. ○ Enables repetitive practice not only of calculations but also of single-line problems. This is a problem book specifically for junior high school entrance exams, focusing on "calculations" and "single-line problems" to strengthen basic skills for national and private junior high school entrance exams. Includes upper and lower volumes, answers, and explanations.