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The twenty bead version, referred to by its Dutch name rekenrek, has two bars.
Before the abacus, there was no such number that existed. du
The number 9 is the maximum number of beads on an abacus because it is the last number in the ones place before the tens place is reached.. The abacus is a tool that was used for arithmetic in ancient times. It is composed of a frame with a series of rods or wires on which beads are strung. The beads are used to represent numbers.
The Chinese abacus
Abacus was invented by the Chinesethe abacus was also known as the first computer