If you are refering to Chinese abacus their earliest rudimentary design of abacus has 1/4 rod beads (quite similar to the later Japanese soroban abacus). Various other types of abacus design were also seen afterwards, but the advance type of 2/5 rod beads became standard and classic. Afterwards, the basic 1/5 rod beads particularly became the type of basic design. The Roman abacus may be not connected to the Chinese abacus.
China invented the abacus .
ABACUS
How did the abacus occur?
disadvantage of abacus
An Abacus has beads and strings.
The Chinese abacus
Other than the human brain, the Abacus
the history about the abacus is that 3000 years ago the chinese invented the abacus. The abacus was made of wood parrelel rod and beads.
it is the abacus. :D :D :D i got is dummies
It was in China about 1200 C.E. when the abacus, known in Chinese as the Suan-Pan, first appeared in written records. The contraption was constructed of wood and reinforced with metal. The abacus extended over the globe and was independently created and utilized in several cultures, including Egypt, Greece, Rome, China, and other Asian nations. It gained particular popularity in China, where it was adapted into other forms including the suanpan (a conventional Chinese abacus) and the soroban in Japan. Other Asian nations as well as various regions of Europe also employed the abacus extensively. In general, the abacus has a long and varied history, with many modifications and adaptations being practiced in several civilizations across the world. It was essential to early mathematics and is still applied in some areas and in some educational settings today.
the Chinese invented the abacus