Bonarty Vintage Style Wooden Abacus - Professional 13 Column Chinese Soroban Calculator Counting Tools for Kids and Adult - Black

Description: - The abacus also called a counting frame, is a calculating tool, Chinese abacus dates to the 2nd century BC, Knowns as the Suanpan. - Abacus can be used for functions other than counting for elementary schools , very efficient suanpan techniques have been developed to do multiplication, division, addition, subtraction, square root and cube root operations at high speed. - 13 Rows Vintage Chinese Wooden Bead Arithmetic Abacus, there are two beads on each rod in the upper deck and five beads each in the bottom, The beads are usually rounded and made of a polished hardwood. Non-toxic and very durable. - Conducive to cultivate and improve children's computing power, memory and attention, Espacially for elementary . - Good for school elementary math teaching aids and addition and subtraction counting. Specification: - Material: Wooden - Size: 24.6x12.2cm / 9.68x4.80inch. Package Includes: 1 Piece Abacus