A study guide containing 158 questions to cultivate mathematical sense. Since it has been used, there may be overlooked pencil markings. We hope this reaches those who need it, with the understanding of this point. - Title: Detective Conan's 158 Questions to Develop Math Sense by Age 12 - ISBN: 9784092274013 - Price: 1500 yen + tax (1650 yen) - Number of Questions: 158 - Author: Gosho Aoyama - Publisher: Shogakukan - Target Age: Up to 12 years old Thank you for viewing.