Sato Publishing Contains 15 sets. Discounts are not available for abacus materials. If you purchase multiple items and save on shipping, the price will be reduced accordingly. Please comment, and I will adjust the price. Shipping will be via anonymous delivery, using the "Nekopos" service. Until you apply for the certification exam, write the answers to the problem sets in a notebook. Once you've applied for the exam, practicing with the print sets is effective. Print sets are also available. If you are not good at mental addition, check out the mental addition hospital below. #Soronyan Abacus Materials ← You can see all the abacus materials here. Please read the profile carefully❗️ Carefully❗️ Carefully❗️ and purchase without commenting unless you have questions or want to combine items. Right brain activation Dementia prevention Preventing cognitive decline Concentration Perseverance Self-study Home learning