My youngest child passed their desired school entrance exam. I will gradually list the study materials they used, expressing my gratitude for them. Answer key for Mathematics I, published in 2003. - Title: Mathematics I Answers - Publisher: KUMON - Publication Year: May 2003 - Cover Color: Blue - Editor: Kumon Education Research Institute, Mathematics Materials Department Thank you for looking. Although I have handled it with care, there are some folds and scuffs due to it being paper. Please only purchase if you understand that this is a used item. There is information about the classroom written on the cover and the inside of the cover. I will list it as is.