The Calculation Helper Abacus (10-bead version) is a teaching material that helps children understand the composition and decomposition of numbers up to 10. We hope this will be helpful for children who find the 20-bead version confusing. It can be used instead of number blocks. It's small enough to fit in a contact bag, making it easy to carry around. ◎ Immediate purchase is possible without comment. ◎ Size of the Calculation Helper Abacus → 4.5cm x 20cm Material → 10mm flat beads, plastic corrugated board, rubber It's compact, lightweight, and durable, so you can carry it in a contact bag. Because it is handmade, there may be some slight misalignments or distortions. Please understand this before purchasing. ◎ We hope that children will feel the joy of finding the answers themselves, and that this will be of some help to parents and teachers in the field. #CalculationHelperAbacus #HelperAbacus #SpecialNeedsEducation #CompositionAndDecompositionOf10 #1stGradeMath #EducationalToy #HandmadeTeachingMaterials #100BeadAbacus #10BeadAbacus Type... Numbers