Yotsuya Otsuka 4-Subject Summary: Mathematics - Title: Mathematics Summary - Publisher: Yotsuya Otsuka - Type: Answers and Explanations - Contents: Mathematics The textbook has the name blacked out. It shows signs of use. Problems have check marks. Please check the photos for scratches and stains. The answer sheets have the name blacked out. The inside is untouched. My child is currently in the first year of junior high school and used this last year. Those who understand that this is a used item, please consider purchasing. Thank you for looking.