By the user moving little beads along bars . different amounts of beads stand for different numbers .
An abacus is a calculation aid, it stores one number and helps the user rapidly perform addition and subtraction. Highly skilled abacus users can also do multiplication and division and sometimes more involved calculations, but such calculations become progressively more labor intensive and time consuming and the abacus cannot assist the user further.
China invented the abacus .
ABACUS
How did the abacus occur?
disadvantage of abacus
An Abacus has beads and strings.
The Chinese 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
the Chinese invented the abacus
the invenor of the abacus is the invenor of me
The abacus II!