“Calculation Helper Abacus” Making Kit, 1 piece (available for immediate purchase) This was created through trial and error, aiming to be easy for children who struggle with calculations to use and to help them understand quantities. For instructions, search "How to make a Calculation Helper Abacus" on YouTube. 【Making Kit】 1 piece: 450 yen Size of the Calculation Helper Abacus → 4.5cm x 20cm Materials → 10mm flat beads, corrugated plastic, rubber bands Please note that the corners of the corrugated plastic will not be processed before shipping. It's compact, lightweight, and durable, so it can be carried in a contact bag. As it is handmade, there may be slight misalignments or distortions. Please understand this before purchasing. #CalculationHelperAbacus #HelperAbacus #20BeadAbacus #SpecialNeedsEducationMaterials #SpecialNeedsEducation #SpecialNeedsClassroom #AdditionWithCarryingOver #SubtractionWithBorrowing #EducationalToy Type...Numbers