Zhusuan

$ 90

Product ID： 004007 Product name: Level 15 abacus Manufacturer: Size: 26.5cmx13.5cm Package: gift box Material: santos rose wood classification：traditional handicraft customization: personalize it!

The abacus formula is an algorithm invented by the Chinese based on the use of calculation chips. It is suitable for the abacus, which has a history of more than 2600 years. With the use of the abacus, people have summed up many calculation formulas, which makes calculation faster.