If you're not good at adding and subtracting, check into this problem set and become a master before you graduate! With answers included! Each page has an inspiring slogan to motivate you! Current exams only have problems with aligned digits, so this problem set will help you concentrate. If you often lose track of what you're calculating, If you skip numbers (forget to include them), If you subtract in the tens place but add in the ones place (or vice versa), If you always make mistakes when adding (or subtracting) certain numbers, or if you read 609 as 690, this is the best material for you. (Many people skip the zero!) Especially, many people struggle with borrowing from 100, 500, 1,000, or 5,000. I recommend copying the problems without writing on them and practicing repeatedly until you completely memorize them. B5 size (with answers) Books are not discounted ❌ (due to copyright law). If you purchase multiple items and save on shipping, the price may be reduced, but it will not be below the list price. #soronyan abacus materials ← You can see all the abacus materials here. If you only purchase this item, it will be shipped by standard mail with only water damage protection. Regular mail is cheap, but your mail may be folded if your mailbox is small. If your mailbox is too small for B5 size or if you need anonymous shipping, you can upgrade to Nekopos for an additional 30 yen, so please comment. Please read the profile carefully❗️carefully❗️carefully❗️ before purchasing without a comment if you have no questions or want to combine shipping. Abacus materials Home study Self-study Adding and subtracting Mitorizan (adding and subtracting) Mitorizan (adding and subtracting) Special training Elderly Brain training Right brain Right brain activation Anti-aging Dementia prevention