For those who are not good at mental addition, let's be admitted to this problem set, become good at it, and be discharged! With answers Each page has a motivational slogan! In the current certification tests, only problems with aligned digits are given, so doing this problem set will improve your concentration. For those who don't know where they are calculating, For those who often skip (forget to include) numbers, For those who subtract in the tens place but add in the ones place (and vice versa), For those who always make mistakes when adding (or subtracting) certain numbers, and for those who read 609 as 690, this is the best material. (Many people skip the 0 in between) In particular, many people are very weak at borrowing from 100, 500, 1,000, and 5,000. It is recommended to copy without writing on it, and practice repeatedly until you completely memorize it with your body. B5 size (with answers) Books are not discounted ❌ (due to copyright law). If you save on shipping by purchasing multiple items, the price will be reduced accordingly, so please comment. #SoronyanSorobanMaterials ← You can see all the soroban materials here. If you only purchase this product, it will be shipped by regular mail with only water damage protection. Regular mail is cheap, so it may be folded if your mailbox is small. If you have a mailbox that cannot fit a B5 size or if you need anonymous shipping, you can change to Nekopos for an additional 30 yen, so please comment. Please read the profile carefully❗️ Carefully❗️ Carefully❗️ and purchase without commenting if you have no questions or want to combine items. Soroban materials Home study Self-study Mental addition Mitorizan Mitirizan Special training Elderly Brain training Right brain Right brain activation Anti-aging Dementia prevention