My Book of Subtraction (Kumon Workbooks) by NA buy used Used & Rare price $6.93 new from$8.95 shop with confidence SPECIAL SHIPPING CONSIDERATIONS FOR USED & RARE ITEMS. Please see the special considerations for shipping Used & Rare items, including extended delivery times, possible import duties & taxes. Delivered in 3-5 weeks Format: Paperback Publisher: Kumon Publishing North America Condition: The following ISBNs are associated with this title: ISBN - 10:1933241071 ISBN - 13:9781933241074 Seller Comments: 1933241071 All orders processed 7 days a week. We value your satisfaction and our feedback! Thanks Y09T. From the Publisher Improve on the skills acquired in My Book of SIMPLE SUBTRACTION by helping your child learn to subtract the numbers up to 25 from whole numbers.