Maybe 9000 or so years ago some guy was taking a walk and tripped over something, when he picked it up he said: "Oh my I just found an abacus! I have no idea if it is useful for anything or not, as I have never seen one before. The beads are not even pretty, just plain wood." He then threw it away and rubbed his sore toe until it felt better and continued his walk.
The above is of course nonsense as mechanisms like the abacus are not found, they are invented or designed. While it is hard to verify as documents don't go back as far as the first abacus (it was already present and used in many cultures before writing or even oral history developed), one could likely say the time given above (9000 years ago) to be a reasonable estimate of when they first were used.
An Abacus has beads and strings.
ABACUS is a name of a calculating apparatus - it is not an acronym.
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.
ABACUS - Abundant Beads, Addition and Calculation Utility System
abacus the Chinese invented it
it is found in china!
China invented the abacus .
How did the abacus occur?
An Abacus has beads and strings.
The Chinese abacus
ABACUS
it is the abacus. :D :D :D i got is dummies
The abacus II!
the Chinese invented the abacus
the invenor of the abacus is the invenor of me
Abacus was invented by the Chinesethe abacus was also known as the first computer
the antonym for abacus is future calculator