Suanpan

The Suanpan is a traditional Chinese abacus, an ancient calculating tool used for arithmetic operations such as addition, subtraction, multiplication, and division. It consists of a rectangular frame with rods that hold beads, which can be moved up and down to represent different values. Typically, a Suanpan has two decks of beads: the upper deck contains two beads per rod representing a value of five, while the lower deck has five beads per rod representing a value of one.