Perfect for first-time mental calculation! This is only for mental calculation of visual problems, so it doesn't matter who the organizer is. Includes 38 sessions With answers Price: 450 yen Will be shipped via non-standard mail. Non-standard mail may be folded if your mailbox is small. If you don't want it folded, you can change to anonymous Nekopos delivery for an additional 30 yen, so please comment. If you purchase as is, it will be sent via non-standard mail. Bundling is welcome! Shipping costs may be reduced, but some items cannot be priced below the list price due to copyright law. #Soronyan Soroban Materials ← You can see all the soroban materials here. Introduction to mental calculation Brain training Right brain activation Anti-aging Self-study Home learning Please read the profile! Please read! Please read! Then, if you have no questions or want to bundle items, please purchase without commenting.