The "Keisan Otasuke Soroban" is a teaching material designed to help children understand addition and subtraction up to 20. It can be used in place of number blocks. It's small enough to fit in a contact bag, making it easy to carry around. This product was created through trial and error while working with children who struggle with math, aiming to create something that is easy for children to use and helps them understand quantities. For detailed instructions, please search "How to use Keisan Otasuke Soroban" on YouTube. The beads are strung on elastic, allowing you to use the stretch of the elastic to create groups of numbers. Flat beads are used, making the beads easy to move. We hope that children can experience the joy of finding the answers themselves, and that this will be of some help to parents and teachers in the field. ◎ "Keisan Otasuke Soroban" x 1 Available for immediate purchase without comment. ◎ For those in a hurry or who prefer anonymous shipping, we will ship via Rakuraku Mercari Delivery for an additional 100 yen, so please let us know in the comments. ◎ We are accepting orders for a making kit on a separate page. ◎ Size of Keisan Otasuke Soroban → 4.5cm x 20cm Materials → Flat beads, plastic corrugated board, elastic Compact, lightweight, and durable, it can be carried in a contact bag. As it is handmade, there may be some slight misalignment or distortion. Please understand this before purchasing. ◎ Although sales images appear on Amazon and other sites, we are only selling on Mercari. #Keisan Otasuke Soroban #Otasuke Soroban #20-bead soroban #Special needs education #Addition with carrying over #Subtraction with borrowing #Educational toy #Handmade teaching materials #100-bead soroban #Special needs class guidance Type... Numbers