Chinese Abacus
Purpose
The Chinese abacus closely models the use of finger patterns for addition and subtraction. Each of the beads above the bar corresponds to one "hand", and has a value of five. Each of the beads below the bar is the same as a `finger' and corresponds to one. Numbers are made by moving the beads to the bar. Each column represents a digit in a number. Try counting to twenty on the abacus, remembering to exchange each group of five ones for one five.
