Beads
Abacus was invented by the Chinesethe abacus was also known as the first computer
Known as a counting devise, the abacus has been in use for many centuries
it is the abacus. :D :D :D i got is dummies
Abacus
The earliest known written record of the Chinese abacus dates to the 14th century AD.
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The china had one with rows wooden round balls on wires, 3 rows of them, 3 balls & 3 balls =6 in the last row, that was add, to subtract it was to the left cool
China invented the abacus .
The abacus is ordinarily attributed to the Chinese, but similar counting devices are known in many different ancient cultures. The system of mathematics used with the Indo-Asian abacus is what set it apart.
Maybe an abacus?
ABACUS